PROCESS FOR CONTINUOUS RECOVERING (METH)ACRYLIC ACID AND APPARATUS FOR THE PROCESS
【TECHNICAL FIELD】
The present invention relates to a method of continuous recovery of (meth)acrylic acid and an apparatus for the method.
【BACKGROUND OF ART】
(Meth)acrylic acid is generally prepared by gas phase oxidation of propane, propylene, (meth)acrolein, and the like in the presence of a catalyst. For example, propane, propylene, and the like are converted to (meth)acrylic acid through (meth)acrolein by gas phase oxidation in the presence of an appropriate catalyst in a reactor, and a reaction product mixed gas including (meth)acrylic acid, non-reacted propane or propylene, (meth)acrolein, an inert gas, carbon dioxide, water vapor, and various organic by-products (acetic acid, heavies, and the like) is obtained in the back end of the reactor.
The (meth)acrylic acid-containing mixed gas contacts an absorption solvent such as process water in a (meth)acrylic acid absorption tower, and is recovered as a (meth)acrylic acid aqueous solution. Further, (meth)acrylic acid-stripped insoluble gas is recycled for a synthesis reaction of (meth)acrylic acid, and a part thereof is incinerated and discharged. The (meth)acrylic acid aqueous solution is distilled and purified to obtain (meth)acrylic acid.
Meanwhile, various methods of controlling process conditions or a process sequence and the like to improve the recovery efficiency of (meth)acrylic acid have been suggested. Representatively, as a method for separating water and acetic acid from the (meth)acrylic acid aqueous solution obtained in the (meth)acrylic acid absorption tower, an azeotropic distillation
3
method using a hydrophobic solvent in a distillation column is known. The azeotropic distillation method is a method of effectively recovering (meth)acrylic acid by recovering acetic acid, which is a main by-product of (meth)acrylic acid synthesis, together with water, through a distillation process using a hydrophobic solvent.
Particularly, the inventors have suggested in Korean Laid-Open Patent Publication No. 2009-0041355 that a hydrophobic solvent is used in a distillation column, and acetic acid containing waste water recovered from the upper part of a distillation column is recycled to a (meth)acrylic acid absorption tower and reused. As such, the azeotropic distillation method in a distillation column has the effects of reducing the amount of waste water, and simultaneously, effectively inhibiting inflow of organic substances, and simplifying the subsequent purification step.
However, the azeotropic distillation method and previously disclosed recovery methods of (meth)acrylic acid have problems in that a large amount of energy is consumed in the process of distilling a (meth)acrylic acid aqueous solution, treatment load in the distillation process is high, and a polymer is produced due to polymerization of (meth)acrylic acid to render normal operation impossible, thus lowering stability of a process operation.
【DETAILED DESCRIPTION OF THE INVENTION】
【Technical Problem】
It is an object of the present invention to provide a method for continuous recovery of (meth)acrylic acid that may remarkably reduce energy consumption and yet enables stable recovery of (meth)acrylic acid and operation of a continuous process.
It is another object of the present invention to provide an apparatus that can be used for the continuous recovery of (meth)acrylic acid.
【Technical Solution】
According to the present invention, provided is a method for continuous
4
recovery of (meth)acrylic acid including:
an absorption process wherein a mixed gas including (meth)acrylic acid, organic by-products, and vapor, which is produced by a synthesis reaction of (meth)acrylic acid, is contacted with water to obtain a (meth)acrylic acid aqueous solution;
an extraction process wherein the (meth)acrylic acid aqueous solution obtained through the absorption process is contacted with an extraction solvent in an extraction column to obtain a (meth)acrylic acid extract solution and a raffinate solution; and
a distillation process wherein a feed including the (meth)acrylic acid extract solution obtained through the extraction process is distilled to obtain (meth)acrylic acid,
wherein the raffinate solution obtained through the extraction process is fed to at least one point corresponding to 10 to 30 % from the uppermost part of the (meth)acrylic acid absorption tower, and
the weight ratio of the extraction solvent to the (meth)acrylic acid aqueous solution fed to the extraction column is greater than 0.3 and less than 1.0.
According to the present invention, the absorption process may be conducted in a packed column type of (meth)acrylic acid absorption tower, and the raffinate solution obtained through the extraction process may be fed to at least one point corresponding to 10 to 30 % from the uppermost part compared to the total packing height of the (meth)acrylic acid absorption tower.
According to the present invention, the absorption process may be conducted in a multistage tray type of (meth)acrylic acid absorption tower, and the raffinate solution obtained through the extraction process may be fed to at least one point corresponding to 10 to 30 % from the uppermost stage compared to the total stage number of the (meth)acrylic acid absorption tower.
The extraction solvent may be a hydrophobic solvent having a boiling point of 10 to 120 120 120 120 ℃.
5
The raffinate solution obtained through the extraction process may include 30 to 60 wt% of (meth)acrylic acid, 30 to 60 wt% of an extraction solvent, 3 to 10 wt% of water, and a remaining amount of organic by-products.
Further, the raffinate solution obtained through the extraction process may include (meth)acrylic acid in the content of 15 wt% or less.
Meanwhile, according to the present invention, an apparatus for continuous recovery of (meth)acrylic acid is provided, including:
a (meth)acrylic acid absorption tower (100) equipped with a mixed gas inlet to which mixed gas including (meth)acrylic acid, organic by-products, and vapor, which is produced by a synthesis reaction of (meth)acrylic acid, is fed, and an aqueous solution outlet from which a (meth)acrylic acid aqueous solution obtained by contact of the mixed gas with water is discharged;
a (meth)acrylic acid extraction column (200) equipped with an aqueous solution inlet connected with the aqueous solution outlet of the absorption tower (100) through an aqueous solution transfer line (102), an extract outlet from which the (meth)acrylic acid extract solution obtained by contact of the introduced (meth)acrylic acid aqueous solution with an extraction solvent is discharged, and a raffinate outlet from which the raffinate solution is discharged; and
a distillation column (300) equipped with an extract inlet connected with the extract outlet of the extraction column (200) through an extract transfer line (203), and a (meth)acrylic acid outlet from which (meth)acrylic acid obtained by distillation of the introduced extract solution is discharged,
wherein the raffinate outlet of the extraction column (200) is connected to at least one point corresponding to 10 to 30 % from the uppermost part of the absorption tower (100) through a raffinate transfer line (201), and
the apparatus is operated such that the weight ratio of the extraction solvent to the (meth)acrylic acid aqueous solution fed to the extraction column(200) is greater than 0.3 and less than 1.0.
6
According to the present invention, the (meth)acrylic acid absorption tower (100) may be a packed column type of absorption tower, and the raffinate outlet of the extraction column (200) may be connected to at least one point corresponding to 10 to 30 % from the uppermost part compared to the total packing height of the absorption tower (100) through a raffinate transfer line (201).
Further, according to the present invention, the (meth)acrylic acid absorption tower (100) may be a multistage tray multistage tray multistage tray multistage tray multistage tray multistage tray multistage tray multistage tray multistage tray type typetype of of absorption tower, and absorption tower, and absorption tower, and absorption tower, and absorption tower, and absorption tower, and absorption tower, and absorption tower, and absorption tower, and absorption tower, and absorption tower, and absorption tower, and absorption tower, and absorption tower, and absorption tower, and the raffinate outlet of the extraction column (200) may be connected to at least one point corresponding to 10 to 30 % from the uppermost stage compared to the total stage number of the absorption tower (100) through a raffinate transfer line (201).
【ADVANTAGEOUS EFFECTS】
The method of continuous recovery of (meth)acrylic acid according to the present invention may remarkably reduce the amount of extraction solvent used and energy consumption of the total process, and minimize polymerization of (meth)acrylic acid in the recovery process, thus enabling stable recovery of (meth)acrylic acid and operation of a continuous process.
【BRIEF DESCRIPTION OF THE DRAWINGS】
FIG . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous . 1 schematically shows the method and apparatus for continuous recovery of (meth)acrylic acid recovery of (meth)acrylic acid recovery of (meth)acrylic acid recovery of (meth)acrylic acid recovery of (meth)acrylic acid recovery of (meth)acrylic acid recovery of (meth)acrylic acid recovery of (meth)acrylic acid recovery of (meth)acrylic acid recovery of (meth)acrylic acid recovery of (meth)acrylic acid recovery of (meth)acrylic acid recovery of (meth)acrylic acid accordingaccording accordingaccording to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention. to one embodiment of the invention.

1: (meth)acrylic acid containing mixed gas
100: (meth)acrylic acid absorption tower
102: (meth)acrylic acid aqueous solution transfer line
150: acetic acid absorption tower
200: (meth)acrylic acid extraction column
201: raffinate transfer line
7
203: extract transfer line
300: distillation column
350: phase separation tank
400: heavies separation tower
CAA: crude (meth)acrylic acid
HPAA: high purity (meth)acrylic acid
【DETAILED DESCRIPTION OF THE EMBODIMENTS】
Hereinafter, a method of continuous recovery of (meth)acrylic acid and a recovery apparatus according to the embodiments of the invention will be explained.
First, the technical terms used herein are only to mention specific embodiments, and are not intended to limit the invention. Further, singular forms used herein include plural forms, unless they have clearly opposite meanings. Further, the meaning of ‘comprising’ as used herein embodies a specific property, area, integer, step, operation, element, or component, and it does not exclude the addition of other specific properties, areas, integers, steps, operations, elements, or components.
Unless otherwise described, terms used herein are defined as follows.
The term '(meth)acrylic acid’ generally refers to acrylic acid, methacrylic acid, or a mixture thereof.
The term '(meth)acrylic acid-containing mixed gas' generally refers to a mixed gas that may be produced when (meth)acrylic acid is prepared by gas phase oxidation. As a non-limiting example, the (meth)acrylic acid-containing mixed gas may be obtained by gas phase oxidation of at least one compound selected from the group consisting of propane, propylene, butane, i-butylene, t-butylene, and (meth)acrolein (‘raw material compound’) in the presence of a catalyst, wherein the (meth)acrylic acid-containing mixed gas may include (meth)acrylic acid, non-reacted raw material compounds, (meth)acrolein, an
8
inert gas, carbon monoxide, carbon dioxide, water vapor, and various organic by-products (acetic acid, light ends, heavies, and the like), and the like.
Herein, the term ‘light ends’ or ‘heavies’ commonly refers to a kind of by-products that can be produced in the process of preparing and recovering aimed (meth)acrylic acid, and has lower or higher molecular weight than (meth)acrylic acid. Further, poorly water-soluble floating material formed by the organic by-products is referred to as ‘scum’.
The term The term The term The term The term The term The term '(meth)acrylic acid(meth)acrylic acid(meth)acrylic acid(meth)acrylic acid(meth)acrylic acid(meth)acrylic acid (meth)acrylic acid(meth)acrylic acid (meth)acrylic acid(meth)acrylic acid aqueous solutionaqueous solutionaqueous solutionaqueous solutionaqueous solutionaqueous solutionaqueous solution aqueous solutionaqueous solutionaqueous solution aqueous solution ' refers to an refers to anrefers to anrefers to an refers to an refers to anrefers to anrefers to an aqueous aqueous aqueous aqueous aqueous aqueous aqueous aqueous solution containing solution containing solution containing solution containing solution containing solution containing solution containing solution containing solution containing solution containing solution containing (meth)acrylic acid, and for example, it may be obtained by contacting the (meth)acrylic acid-containing mixed gas with an absorption solvent including water.
The term ‘feed’ refers to a liquid mixture containing a solute to be extracted, and it may be a mixture of a solute that is soluble in an extraction solvent and inert material that is not soluble in an extraction solvent. Herein, if the extraction solvent is added to the feed, the solute is dissolved in the extraction solvent from the feed by mass transfer. Thereby, the extraction solvent in which a significant amount of solutes is dissolved forms an extract solution, and the feed that is deprived of a significant amount of solutes forms a raffinate solution.
Meanwhile, Meanwhile, Meanwhile, Meanwhile, Meanwhile, Meanwhile, Meanwhile, Meanwhile, Meanwhile, in liquid in liquid in liquidin liquidin liquid -liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a liquid extraction using agitated columns such as a KarrKarrKarr -type column type columntype columntype columntype column type column andandand a ScheibelScheibel ScheibelScheibel Scheibel-type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to type column, a relatively light phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the lower stage of extraction column and a relatively heavy phase is fed to the upper stage of extraction c the upper stage of extraction cthe upper stage of the extraction cthe upper stage of the extraction cthe upper stage of the extraction cthe upper stage of the extraction cthe upper stage of the extraction cthe upper stage of the extraction c the upper stage of extraction c the upper stage of extraction cthe upper stage of the extraction cthe upper stage of the extraction cthe upper stage of the extraction cthe upper stage of the extraction cthe upper stage of the extraction cthe upper stage of the extraction cthe upper stage of the extraction c the upper stage of extraction cthe upper stage of the extraction cthe upper stage of the extraction cthe upper stage of the extraction cthe upper stage of the extraction c the upper stage of extraction c the upper stage of extraction cthe upper stage of the extraction column.olumn. olumn. FurtherFurtherFurther Further, extractionextractionextraction extraction is progressed by is progressed by is progressed by is progressed by is progressed by is progressed by is progressed by is progressed by is progressed by the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and the contact of materials fed to extraction column, obtain a light phase and a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions. a heavy phase of new compositions.
The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of The light phase of the the the new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction new composition obtained through the extraction process is obtained tprocess is obtained t process is obtained t process is obtained tprocess is obtained t process is obtained tprocess is obtained tprocess is obtained tprocess is obtained tprocess is obtained t process is obtained tprocess is obtained tprocess is obtained through the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and hrough the upper outlet of extraction column, and heavy phase of heavy phase of heavy phase of heavy phase of heavy phase of heavy phase of heavy phase of heavy phase of heavy phase of heavy phase of heavy phase of heavy phase of heavy phase of heavy phase of the the the the new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of new composition is obtained through the lower outlet of extraction column. extraction column. extraction column. extraction column. extraction column. extraction column. extraction column. extraction column. extraction column.
In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of In general, the heavy phase of the the the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the new composition obtained through the
9
extraction process, before extraction process, before extraction process, before extraction process, before extraction process, before extraction process, before extraction process, before extraction process, before extraction process, before extraction process, before extraction process, before extraction process, before being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction being discharged to the lower outlet of extraction column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of column, remains stationary at the lower part of extractionextractionextraction extraction extraction column, and a part column, and a part column, and a part column, and a part column, and a part column, and a part column, and a part column, and a part column, and a part column, and a part column, and a part column, and a part column, and a part thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column. thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column.thereof is discharged to the lower outlet of extraction column. Herein Herein , the , the , the , the section of the extraction column in wh section of the extraction column in wh section of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in wh section of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in wh section of the extraction column in wh section of the extraction column in whsection of the extraction column in whsection of the extraction column in wh section of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in whsection of the extraction column in which the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is ich the heavy phase remains stationary is referred to as referred to as referred to as referred to as referred to as referred to as referred to as referred to as ‘lower stationary section lower stationary sectionlower stationary section lower stationary sectionlower stationary section lower stationary sectionlower stationary sectionlower stationary section lower stationary section lower stationary section lower stationary section’ (or ‘stationary section of heavy phase stationary section of heavy phasestationary section of heavy phase stationary section of heavy phasestationary section of heavy phasestationary section of heavy phase stationary section of heavy phase stationary section of heavy phase stationary section of heavy phasestationary section of heavy phase stationary section of heavy phase stationary section of heavy phasestationary section of heavy phasestationary section of heavy phasestationary section of heavy phase stationary section of heavy phase stationary section of heavy phasestationary section of heavy phasestationary section of heavy phase ’).
For example, in the For example, in the For example, in the For example, in the For example, in the For example, in the For example, in the For example, in the For example, in the For example, in the For example, in the For example, in the For example, in the processprocessprocessprocess process of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a of extracting (meth)acrylic acid included in a (meth)acrylic acid aqueous solution using an extractio (meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio (meth)acrylic acid aqueous solution using an extractio (meth)acrylic acid aqueous solution using an extractio (meth)acrylic acid aqueous solution using an extractio (meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio (meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio (meth)acrylic acid aqueous solution using an extractio (meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio (meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio (meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio(meth)acrylic acid aqueous solution using an extractio (meth)acrylic acid aqueous solution using an extractio n solvent, the n solvent, the n solvent, the n solvent, the n solvent, the n solvent, the n solvent, the n solvent, the n solvent, the n solvent, the n solvent, the n solvent, the (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is (meth)acrylic acid aqueous solution that is in in a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to a relatively heavy phase is fed to the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is the upper stage of extraction column, and solvent that is in in in a relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column. relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column.relatively light phase is fed to the lower stage of extraction column. Furtherurther urtherurther, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, extraction is progressed by the contact thereof, and and and and an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which an extract solution in which a significant a significant a significant a significant a significant a significant a significant a significant a significant amountamountamountamountamountamount of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution of (meth)acrylic acid is dissolved and a raffinate solution that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained. that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained.that is deprived of a significant amount (meth)acrylic acid are obtained. Herein Herein , the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is the extract solution that is in in a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through a relatively light phase is obtained through the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of the upper outlet of extractionextractionextraction extraction column, column, column, column, column, and the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is the raffinate solution that is in a relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction relatively heavy phase is obtained through the lower outlet of extraction column. column. column.
Hereinafter, referring to the attached drawing, a specific embodiment of the invention will be explained in detail so that one of ordinary knowledge in the art may easily practice it. However, the present invention may be embodied in various forms, and is not limited to the examples.
Meanwhile, during studies on a method of continuous recovery of (meth)acrylic acid, it was confirmed that the previously disclosed recovery method of (meth)acrylic acid through azeotropic distillation consumes a large amount of energy in the distillation process, and has lowered process stability due to the production of a polymer by polymerization of (meth)acrylic acid during the distillation process.
Thus, as a result of continuous studies, the inventors confirmed that if a
10
(meth)acrylic acid extraction process is introduced between a (meth)acrylic acid absorption process and a distillation process as shown in FIG. 1, an operation load of the distillation process may be remarkably lowered. Furthermore, it was confirmed that if a raffinate solution of the extraction process is fed to a specific point of a (meth)acrylic acid absorption tower, and simultaneously the weight ratio of an extraction solvent to a (meth)acrylic acid aqueous solution in the extraction process is controlled, energy consumption compared to recovery rate of (meth)acrylic acid may be remarkably lowered, and more stable operation of a continuous process is enabled.
I. A method of continuous recovery of (meth)acrylic acid
According to one embodiment of the invention, a method for continuous recovery of (meth)acrylic acid is provided, including:
an absorption process wherein a mixed gas including (meth)acrylic acid, organic by-products, and vapor, which is produced by a synthesis reaction of (meth)acrylic acid, is contacted with water to obtain a (meth)acrylic acid aqueous solution;
an extraction process wherein the (meth)acrylic acid aqueous solution obtained through the absorption process is contacted with an extraction solvent in an extraction column to obtain a (meth)acrylic acid extract solution and a raffinate solution; and
a distillation process wherein a feed including the (meth)acrylic acid extract solution obtained through the extraction process is distilled to obtain (meth)acrylic acid,
wherein the raffinate solution obtained through the extraction process is fed to at least one point corresponding to 10 to 30 % from the uppermost part of the (meth)acrylic acid absorption tower, and
the weight ratio of the extraction solvent to the (meth)acrylic acid aqueous solution fed to the extraction column is greater than 0.3 and less than 1.0.
11
Hereinafter, referring to FIG. 1, each process that can be included in the embodiment of the invention will be explained.
(Absorption process)
An absorption process is a process for obtaining a (meth)acrylic acid aqueous solution, and it may be conducted by contacting a (meth)acrylic acid-containing mixed gas obtained through the synthesis reaction of (meth)acrylic acid with an absorption solvent including water.
As a non-limiting example, the synthesis reaction of (meth)acrylic acid may be conducted by the oxidation reaction of at least one compound selected from the group consisting of propane, propylene, butane, isobutylene, and (meth)acrolein in the presence of a gas phase catalyst. Herein, the gas phase oxidation reaction may be progressed using a gas phase oxidation reactor of a common structure and under common reaction conditions. As the catalyst for the gas phase oxidation reaction, common catalysts may be used, and for example, catalysts suggested in Korean Registered Patent No. 0349602 and No. 037818 and the like may be used. In the (meth)acrylic acid-containing mixed gas produced by the gas phase oxidation reaction, in addition to the desired product (meth)acrylic acid, non-reacted raw material compounds, intermediate (meth)acrolein, an inert gas, carbon dioxide, vapor, and various organic by-products (acetic acid, light ends, heavies, and the like) may be included.
Further, referring to FIG. 1, the (meth)acrylic acid aqueous solution may be obtained by feeding a (meth)acrylic acid-containing mixed gas (1) to a (meth)acrylic acid absorption tower (100) to contact it with an absorption solvent including water.
Herein, the kind of the (meth)acrylic acid absorption tower (100) may be determined considering contact efficiency of the mixed gas (1) with the absorption solvent, and the like. As non-limiting examples, the (meth)acrylic acid absorption tower (100) may be a packed column tower or a multistage tray
12
tower. Inside the packed tower, a filler such as a Raschig ring, a pall ring, a saddle, gauze, structured packing, and the like may be applied.
Further, considering the efficiency of the absorption process, the mixed gas (1) may be fed to the lower part of the absorption tower (100), and the solvent including water may be fed to the upper part of the absorption tower (100).
The absorption solvent may include water such as tap water, deionized water, and the like, and it may include recycled process water introduced from other processes (for example, an aqueous phase recycled from an extraction process and/or a distillation process). Further, in the absorption solvent, a trace amount of organic by-products introduced from other processes (for example, acetic acid) may be included. However, considering the absorption efficiency of (meth)acrylic acid, it is preferable that organic by-products may be included in the content of 15 wt% or less in the absorption solvent fed to the absorption tower (100) (particularly, in the recycled process water).
Furthermore, according to the embodiment of the invention, a raffinate solution that is obtained in a (meth)acrylic acid extraction column (200) as described below may be recycled to a (meth)acrylic acid absorption tower (100) and used as an absorption solvent. Particularly, it is more advantageous in terms of improvement in process efficiency that the raffinate solution is fed to at least one point corresponding to 10 to 30 % from the uppermost part of the absorption tower (100), which will be explained in detail with regard to a (meth)acrylic acid extraction column (200) below.
Further, the (meth)acrylic acid absorption tower (100) may be operated at an internal pressure of 1 to 1.5 bar or 1 to 1.3 bar, and at an internal temperature of 50 to 100 ℃ or 50 to 80 ℃, considering condensation conditions and moisture content according to saturated water vapor pressure, and the like.
Meanwhile, in the absorption process, a (meth)acrylic acid aqueous solution is discharged to the lower part of the (meth)acrylic acid absorption
13
tower (100), and (meth)acrylic acid-stripped non-condensable gas is discharged to the upper part thereof. Herein, it may be favorable in terms of efficiency of the total process that 40 wt% or more, or 40 to 90 wt%, or 50 to 90 wt% of (meth)acrylic acid may be included in the (meth)acrylic acid aqueous solution.
The obtained (meth)acrylic acid aqueous solution may be fed to a (meth)acrylic acid extraction column (200) through an aqueous solution transfer line (102), as shown in FIG. 1. If an extraction process is introduced between a (meth)acrylic acid absorption process and a distillation process as shown in FIG. 1, most absorption solvent included in the (meth)acrylic acid aqueous solution may be removed in the extraction process, thus lowering a treatment load of the distillation process and reducing energy consumption.
Meanwhile, at least a part of the non-condensable gas discharged to the upper part of the (meth)acrylic acid absorption tower (100) may be fed to a process of recovering organic by-products (particularly, acetic acid) included in the non-condensable gas, and the remainder may be fed to a waste gas incinerator and discarded. Namely, according to one embodiment of the invention, a process of contacting the non-condensable gas with an absorption solvent to recover acetic acid included in the non-condensable gas may be progressed.
The process of contacting the non-condensable gas with an absorption solvent may be conducted in an acetic acid absorption tower (150). As a non-limiting example, an absorption solvent (process water) for absorbing acetic acid may be fed to the upper part of the acetic acid absorption tower (150), and an aqueous solution containing acetic acid may be discharged to the lower part of the acetic acid absorption tower (150). Further, the acetic acid-containing aqueous solution may be fed to the upper part of the (meth)acrylic acid absorption tower (100) and used as an absorption solvent. In addition, acetic acid-stripped non-condensable gas may be recycled to the synthesis process of (meth)acrylic acid and reused.
Herein, for effective absorption of acetic acid, the acetic acid absorption
14
tower (150) may be operated at the internal pressure of 1 to 1.5 bar or 1 to 1.3 bar, and at the internal temperature of 50 to 100 ℃ or 50 to 80 ℃. In addition, specific operation conditions of the acetic acid absorption tower (150) may follow the disclosure of Korean Laid-Open Patent Publication No. 2009-0041355.
(Extraction process)
Meanwhile, an extraction process wherein a (meth)acrylic acid aqueous solution is contacted with an extraction solvent in an extraction column to obtain a (meth)acrylic acid extract solution and a raffinate solution is conducted. Herein, the (meth)acrylic acid aqueous solution may be prepared by the above-explained absorption process.
The extraction process may be conducted in a (meth)acrylic acid extraction column (200). The (meth)acrylic acid aqueous solution fed to the extraction column (200) contacts with an extraction solvent, and is discharged as an extract solution in which a significant amount of (meth)acrylic acid is dissolved and a raffinate solution that is deprived of a significant amount of (meth)acrylic acid, respectively.
Herein, the extract solution that is in a relatively light phase is obtained through the upper outlet of the extraction column (200), and the raffinate solution that is in a relatively heavy phase is obtained through the lower outlet of the extraction column. Before the raffinate solution is discharged from the extraction column (200), a certain amount thereof remains stationary at the stationary section of the lower part of the extraction column, and a part thereof is discharged to the lower outlet of the extraction column.
As such, by contacting the (meth)acrylic acid aqueous solution with an extraction solvent in an extraction column (200) (namely, extraction with small energy consumption compared to distillation), most water included in the (meth)acrylic acid aqueous solution may be removed. Thereby, a treatment load of the subsequent distillation process may be lowered, thus improving
15
energy efficiency of total process. Furthermore, by lowering treatment load of the distillation process, polymerization of (meth)acrylic acid that may be generated during distillation may be minimized, to secure more improved recovery efficiency of (meth)acrylic acid.
Meanwhile, the raffinate solution obtained in the extraction process is recycled to the above-explained absorption process as an absorption solvent. Particularly, according to the embodiment of the invention, the raffinate solution may be fed to at least one point corresponding to 10 to 30 %, or 10 to 25 %, or 15 to 30 %, or 10 to 20 %, or 15 to 25 % from the uppermost part, instead of the uppermost part of the (meth)acrylic acid absorption tower (100). Further simultaneously, the weight ratio (S/F) of the extraction solvent to the (meth)acrylic acid aqueous solution (i.e., feed) fed to the extraction column (200) may be controlled to greater than 0.3 and less than 1.0, or greater than 0.3 and 0.8 or less, or 0.5 or more and less than 1.0, or 0.5 or more and 0.8 or less.
As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through As such, by recycling the raffinate solution obtained through extraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption tower extraction process to a specific point of the absorption tower extraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption tower extraction process to a specific point of the absorption tower extraction process to a specific point of the absorption tower extraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption tower extraction process to a specific point of the absorption towerextraction process to a specific point of the absorption tower extraction process to a specific point of the absorption towerextraction process to a specific point of the absorption tower extraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption tower extraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption tower extraction process to a specific point of the absorption tower extraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption tower extraction process to a specific point of the absorption tower extraction process to a specific point of the absorption tower extraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption towerextraction process to a specific point of the absorption tower (100) and (100) and (100) and (100) and (100) and (100) and (100) and simultaneou simultaneousimultaneou simultaneousimultaneousimultaneousimultaneousimultaneously controlling the controlling the controlling the controlling the controlling the controlling the controlling the controlling the controlling the controlling the weightweightweight weightweight ratio (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, (S/F) of the extraction solvent, amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and amount of the extraction solvent used and processprocess process energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be energy consumption may be remarkably reduced. remarkably reduced.remarkably reduced. remarkably reduced.remarkably reduced. remarkably reduced.remarkably reduced. remarkably reduced.remarkably reduced. remarkably reduced.remarkably reduced. Namely, through the Namely, through the Namely, through the Namely, through the Namely, through the Namely, through the Namely, through the Namely, through the Namely, through the Namely, through the Namely, through the Namely, through the aboveaboveaboveaboveabove-explained explained explained explained explained explained explained processprocess processprocess conditions, conditions, conditions, conditions, conditions, conditions, conditions, the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above the recovery method of above embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of embodiment may minimize loss of (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even (meth)acrylic acid in the absorption process and extraction even with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. with a smaller amount of extraction solvent and lower energy consumption.with a smaller amount of extraction solvent and lower energy consumption. Further FurtherFurther, solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation , solvent reflux may be increased in the subsequent distillation process, process, process, process, thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid. thus further increasing recovery efficiency of (meth)acrylic acid.
In the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ratio n the extraction process, if weight ratio n the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ratio n the extraction process, if weight ratio n the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ration the extraction process, if weight ratio n the extraction process, if weight ration the extraction process, if weight ratio n the extraction process, if weight ratio (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent (S/F) of the extraction solvent to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in to the feed is 0.3 or less, removal efficiency of absorption solvent in extractionextractionextraction extraction processprocess process may be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, ay be lowered, and long time operation may impossible, and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become and thus the effect of introducing extraction process may become insignificant. insignificant.insignificant. insignificant. insignificant. Further FurtherFurther, if the weight ratio, if the weight ratio, if the weight ratio , if the weight ratio , if the weight ratio, if the weight ratio, if the weight ratio, if the weight ratio, if the weight ratio , if the weight ratio, if the weight ratio , if the weight ratio (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to (S/F) of the extraction solvent to
16
feed is feed is feed is feed is feed is 1.01.0 or more, the effect of reducing eor more, the effect of reducing e or more, the effect of reducing eor more, the effect of reducing eor more, the effect of reducing e or more, the effect of reducing eor more, the effect of reducing eor more, the effect of reducing eor more, the effect of reducing eor more, the effect of reducing eor more, the effect of reducing eor more, the effect of reducing e or more, the effect of reducing e or more, the effect of reducing eor more, the effect of reducing eor more, the effect of reducing eor more, the effect of reducing e or more, the effect of reducing eor more, the effect of reducing e or more, the effect of reducing eor more, the effect of reducing energy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become nergy consumption may become insignificant. insignificant.insignificant. insignificant. insignificant. Particularly, as the weight ratioParticularly, as the weight ratioParticularly, as the weight ratio Particularly, as the weight ratioParticularly, as the weight ratio Particularly, as the weight ratioParticularly, as the weight ratio Particularly, as the weight ratioParticularly, as the weight ratio Particularly, as the weight ratio Particularly, as the weight ratioParticularly, as the weight ratioParticularly, as the weight ratioParticularly, as the weight ratioParticularly, as the weight ratio Particularly, as the weight ratioParticularly, as the weight ratio Particularly, as the weight ratio (S/F) increases, although (S/F) increases, although (S/F) increases, although (S/F) increases, although (S/F) increases, although (S/F) increases, although (S/F) increases, although (S/F) increases, although (S/F) increases, although (S/F) increases, although (S/F) increases, although (S/F) increases, although (S/F) increases, although extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase extraction efficiency may be improved, loss of (meth)acrylic acid increase in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation in the subsequent distillation processprocess process , and , and , and , and , and , and solventsolventsolvent solventsolventsolvent reflux reflux reflux reflux for preventin for preventin for preventinfor preventin for preventinfor preventinfor preventin for preventing this may g this may g this may g this may g this may g this may g this may g this may becomebecomebecome becomebecome excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable. excessively high, which is not preferable.
MeanwhileMeanwhileMeanwhileMeanwhileMeanwhileMeanwhileMeanwhile Meanwhile, the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic the point of feeding raffinate solution to (meth)acrylic acid absorption toweracid absorption tower acid absorption toweracid absorption toweracid absorption toweracid absorption toweracid absorption tower acid absorption toweracid absorption toweracid absorption tower acid absorption toweracid absorption toweracid absorption tower (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined (100) may be determined considering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where onsidering the part where substantial absorption is substantial absorption is substantial absorption is substantial absorption is substantial absorption is substantial absorption is substantial absorption is substantial absorption is substantial absorption is substantial absorption is substantial absorption is substantial absorption is substantial absorption is substantial absorption is substantial absorption is achievedachieved achieved achievedachieved, according , according, according , according , according, according to the kind of absorption tower to the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption tower to the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption tower to the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption towerto the kind of absorption tower (100) (100)(100). For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed For example, in case the absorption process is conducted a packed column type column type column type column type column type column type column type of of (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution (meth)acrylic acid absorption tower, the raffinate solution obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one obtained through the extraction process may be fed to at least one point point point point point corresponding to 10 30 corresponding to 10 30 corresponding to 10 30corresponding to 10 30 corresponding to 10 30corresponding to 10 30corresponding to 10 30corresponding to 10 30 corresponding to 10 30corresponding to 10 30 corresponding to 10 30corresponding to 10 30corresponding to 10 30corresponding to 10 30corresponding to 10 30corresponding to 10 30corresponding to 10 30corresponding to 10 30corresponding to 10 30 % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total % from the uppermost part compared to total packing height of the (meth)packing height of the (meth)packing height of the (meth) packing height of the (meth)packing height of the (meth)packing height of the (meth)packing height of the (meth) packing height of the (meth)packing height of the (meth)packing height of the (meth)packing height of the (meth)packing height of the (meth) packing height of the (meth)packing height of the (meth)packing height of the (meth)packing height of the (meth)packing height of the (meth) packing height of the (meth)packing height of the (meth)packing height of the (meth)packing height of the (meth)acrylicacrylic acrylicacrylic acrylic acid acid absorptionabsorptionabsorption absorption absorption tower. tower.tower.tower.tower. Further FurtherFurther, in case the , in case the , in case the , in case the , in case the , in case the , in case the , in case the , in case the , in case the , in case the absorptionabsorptionabsorption absorption absorptionabsorption processprocess processprocess is is conducted conductedconductedconductedconducted conductedconducted in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid in a multistage tray type (meth)acrylic acid absorption tower, absorption tower, absorption tower, absorption tower, absorption tower, absorption tower, absorption tower, absorption tower, absorption tower, absorption tower, absorption tower, absorption tower, absorption tower, the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction the raffinate solution obtained through extraction processprocess processprocess may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30 may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30 may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30 may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30 may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30 may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30 may be fed to at least one point corresponding 10 30 may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30 may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30 may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30may be fed to at least one point corresponding 10 30 % from the % from the % from the % from the % from the % from the % from the % from the % from the uppermost uppermost uppermost uppermost uppermost uppermost uppermost uppermost stagestagestagestagestage compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid compared to the total stage number of (meth)acrylic acid absorption tower. absorption tower. absorption tower. absorption tower. absorption tower. absorption tower. absorption tower. absorption tower. absorption tower. absorption tower. absorption tower. absorption tower.
Herein Herein , in case the raffina , in case the raffina , in case the raffina, in case the raffina , in case the raffina, in case the raffina, in case the raffina, in case the raffina, in case the raffina, in case the raffina, in case the raffina, in case the raffina , in case the raffina, in case the raffina, in case the raffina , in case the raffinate solution is fed to a point exceeding 30 te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30 te solution is fed to a point exceeding 30 te solution is fed to a point exceeding 30 te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30 te solution is fed to a point exceeding 30 te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30 te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30 te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30 te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30 te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30te solution is fed to a point exceeding 30 % from the uppermost part of absorption towerfrom the uppermost part of absorption tower from the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption tower from the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption tower from the uppermost part of absorption towerfrom the uppermost part of absorption tower from the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption tower from the uppermost part of absorption towerfrom the uppermost part of absorption tower from the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption tower from the uppermost part of absorption tower from the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption tower from the uppermost part of absorption towerfrom the uppermost part of absorption towerfrom the uppermost part of absorption tower (100), (100), (100), (100), absorptionabsorptionabsorptionabsorptionabsorption absorption efficiency efficiency efficiency efficiency efficiency efficiency efficiency efficiency may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may be lowered, and loss of (meth)acrylic acid through the raffinate solution may increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering to may increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering to may increase in the extraction process, thus lowering to may increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering to may increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering to may increase in the extraction process, thus lowering to may increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering to may increase in the extraction process, thus lowering to may increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering to may increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering tomay increase in the extraction process, thus lowering to tal tal tal processprocess processprocess

We Claim:
【Claim 1】
A method for continuous recovery of (meth)acrylic acid, comprising:
an absorption process wherein a mixed gas including (meth)acrylic acid, organic by-products, and vapor, which is produced by a synthesis reaction of (meth)acrylic acid, is contacted with water to obtain a (meth)acrylic acid aqueous solution;
an extraction process wherein the (meth)acrylic acid aqueous solution obtained through the absorption process is contacted with an extraction solvent in an extraction column to obtain a (meth)acrylic acid extract solution and a raffinate solution; and
a distillation process wherein a feed including the (meth)acrylic acid extract solution obtained through the extraction process is distilled to obtain (meth)acrylic acid,
wherein the raffinate solution obtained through the extraction process is fed to at least one point corresponding to 10 to 30 % from the uppermost part of the (meth)acrylic acid absorption tower, and
a weight ratio of the extraction solvent to the (meth)acrylic acid aqueous solution fed to the extraction column is greater than 0.3 and less than 1.0.
【Claim 2】
The method for continuous recovery of (meth)acrylic acid according to claim 1, wherein the absorption process is conducted in a packed column type of (meth)acrylic acid absorption tower, and
the raffinate solution obtained through the extraction process is fed to at least one point corresponding to 10 to 30 % from an uppermost part compared to a total packing height of the (meth)acrylic acid absorption tower.
38
【Claim 3】
The method for continuous recovery of (meth)acrylic acid according to claim 1, wherein the absorption process is conducted in a multistage tray type of (meth)acrylic acid absorption tower, and
the raffinate solution obtained through the extraction process is fed to at least one point corresponding to 10 to 30 % from an uppermost stage compared to a total stage number of the (meth)acrylic acid absorption tower.
【Claim 4】
The method for continuous recovery of (meth)acrylic acid according to claim 1, wherein the extraction solvent is a hydrophobic solvent having a boiling point of 10 to 120 120 120 120 ℃.
【Claim 5】
The method for continuous recovery of (meth)acrylic acid according to claim 1, wherein the extraction solvent is at least one selected from the group consisting of benzene, toluene, xylene, n-heptane, cycloheptane, cycloheptene, 1-heptene, ethyl-benzene, methyl-cyclohexane, n-butyl acetate, isobutyl acetate, isobutyl acrylate, n-propyl acetate, isopropyl acetate, methyl isobutyl ketone, 2-methyl-1-heptene, 6-methyl-1-heptene, 4-methyl-1-heptene, 2-ethyl-1-hexene, ethylcyclopentane, 2-methyl-1-hexene, 2,3-dimethylpentane, 5-methyl-1-hexene, and isopropyl-butyl-ether.
【Claim 6】
The method for continuous recovery of (meth)acrylic acid according to claim 1, wherein the raffinate solution obtained through the extraction process includes 30 to 60 wt% of (meth)acrylic acid, 30 to 60 wt% of an extraction solvent, 3 to 10 wt% of water, and a remaining amount of organic by-products.
39
【Claim 7】
The method for continuous recovery of (meth)acrylic acid according to claim 1, wherein the raffinate solution obtained through the extraction process includes (meth)acrylic acid in a content of 15 wt% or less.
【Claim 8】
The method for continuous recovery of (meth)acrylic acid according to claim 1, wherein the synthesis reaction of (meth)acrylic acid is an oxidation reaction of at least one compound selected from the group consisting of propane, propylene, butane, isobutylene, and (meth)acrolein in the presence of a gas phase catalyst.
【Claim 9】
An apparatus for continuous recovery of (meth)acrylic acid, comprising:
a (meth)acrylic acid absorption tower equipped with a mixed gas inlet to which a mixed gas including (meth)acrylic acid, organic by-products, and vapor, which is produced by a synthesis reaction of (meth)acrylic acid, is fed, and an aqueous solution outlet from which a (meth)acrylic acid aqueous solution obtained by contact of the mixed gas with water is discharged;
a (meth)acrylic acid extraction column equipped with an aqueous solution inlet connected with the aqueous solution outlet of the absorption tower through an aqueous solution transfer line, an extract outlet from which the (meth)acrylic acid extract solution obtained by contact of the introduced (meth)acrylic acid aqueous solution with an extraction solvent is discharged, and a raffinate outlet from which the raffinate solution is discharged; and
a distillation column equipped with an extract inlet connected with the extract outlet of the extraction column through an extract transfer line, and a (meth)acrylic acid outlet from which (meth)acrylic acid obtained by distillation of the introduced extract solution is discharged,
wherein the raffinate outlet of the extraction column is connected to at
40
least one point corresponding to 10 to 30 % from the uppermost part of the absorption tower through a raffinate transfer line, and
the apparatus is operated such that a weight ratio of the extraction solvent to the (meth)acrylic acid aqueous solution fed to the extraction column is greater than 0.3 and less than 1.0.
【Claim 10】
The apparatus for continuous recovery of (meth)acrylic acid according to claim 9, wherein the (meth)acrylic acid absorption tower is a packed column type of absorption tower, and
the raffinate outlet of the extraction column is connected to at least one point corresponding to 10 to 30 % from an uppermost part compared to the total packing height of the absorption tower through a raffinate transfer line.
【Claim 11】
The apparatus for continuous recovery of (meth)acrylic acid according to claim 9, wherein the (meth)acrylic acid absorption tower is a multistage tray multistage tray multistage tray multistage tray multistage tray multistage tray multistage tray multistage tray multistage tray type typetype of of of absorption tower, andabsorption tower, andabsorption tower, and absorption tower, and absorption tower, andabsorption tower, andabsorption tower, and absorption tower, andabsorption tower, andabsorption tower, andabsorption tower, andabsorption tower, and absorption tower, andabsorption tower, andabsorption tower, and
the raffinate outlet of the extraction column is connected to at least one point corresponding to 10 to 30 % from an uppermost stage compared to the total stage number of the absorption tower through a raffinate transfer line.