Invention title: Cooling system and separation method
Technical field
[0001]
　The present disclosure relates to cooling systems and separation methods.
Background technology
[0002]
　In recent years, non-woven fabrics have been widely used in various applications because of their excellent breathability and flexibility. Typical uses of non-woven fabrics include, for example, absorbent articles such as disposable diapers and sanitary napkins, sanitary masks, medical gauze, and base cloths for compresses.
[0003]
　As a method for producing a nonwoven fabric, for example, a method of melt-kneading a resin composition containing a polymer such as a propylene-based polymer in an extruder and spinning the melt-kneaded resin composition to produce a nonwoven fabric is known. (See, for example, Patent Document 1).
Prior art literature
Patent documents
[0004]
Patent Document 1: Japanese Unexamined Patent Publication No. 2000-9614
Outline of the invention
Problems to be solved by the invention
[0005]
　When a polymer as a non-woven fabric raw material is melt-kneaded, a part of the non-woven fabric raw material may be decomposed, or the additive added at the time of melt-kneading may be decomposed or volatilized to generate a gas containing an organic compound. As a measure for the environment, it is necessary to separate and remove the organic compound from the gas containing the organic compound, and then exhaust the gas to the outside of the system. For example, as a method for separating and removing an organic compound, a gas containing the organic compound generated during the production of a non-woven fabric is supplied to a heat exchanger, and the gas is cooled by the heat exchanger to solidify or liquefy the organic compound. There is a method of separating and removing the compound.
[0006]
　However, when the organic compound in the gas is solidified or liquefied and separated and removed using a heat exchanger, the organic compound solidified by cooling adheres to the inside of the heat exchanger, for example, fins, and the heat exchanger is clogged. There is a risk. In order to prevent the heat exchanger from being clogged due to the heat exchange temperature dropping too low, it is necessary to reduce the amount of refrigerant such as cooling water to the heat exchanger to operate the heat exchanger. As a result, there is a problem that the organic compound is not sufficiently separated and removed by the heat exchanger, and the gas from which the organic compound is not sufficiently removed is exhausted to the outside of the system.
[0007]
　The present invention has been made in view of the above circumstances, and is a cooling system capable of suppressing clogging of a heat exchanger and efficiently separating and removing organic compounds in a gas discharged from a manufacturing unit that manufactures a non-woven fabric. It is an object of the present invention to provide a separation method using this.
Means to solve problems
[0008]
　The means for solving the above-mentioned problems include the following aspects.
<1> A manufacturing section for producing a non-woven fabric by melt-kneading a polymer and spinning and molding the melt-kneaded polymer, and a discharging section for discharging gas containing an organic compound generated when the polymer is melt-kneaded. A first heat exchanger that cools the gas discharged from the discharge unit and a gas that is arranged downstream of the first heat exchanger and cools the gas discharged from the first heat exchanger. A cooling system including a second heat exchanger and an exhaust unit for exhausting the gas discharged from the second heat exchanger to the outside of the system.
<2> The cooling system according to <1>, wherein the first heat exchanger is a fin tube type heat exchanger.
<3> The cooling system according to <1> or <2>, wherein the second heat exchanger is a orthogonal flow type heat exchanger.
<4> A path connecting the downstream side of the first heat exchanger and the upstream side of the second heat exchanger, and connecting the downstream side of the second heat exchanger and the exhaust portion, and the above. Whether or not to supply the bypass path connecting the upstream side and the downstream side of the second heat exchanger in the path and the gas discharged from the first heat exchanger to the second heat exchanger. The cooling system according to any one of <1> to <3>, further comprising a switchable switching unit.
<5> The organic compound is selected from 2,4-dimethyl-heptene, 2,6-dimethylnonane, propylene tetramer, propylene pentamer, their isomers, diacetylbenzene and di-tert-butylphenol. The cooling system according to any one of <1> to <4>, which comprises at least one type.
<6> Any one of <1> to <5> including a control unit that controls the gas discharged from the discharge unit to be cooled to more than 30 ° C. and 50 ° C. or lower by the first heat exchanger. One of the cooling systems described.
<7> The cooling according to <6>, wherein the control unit controls the second heat exchanger to cool the gas discharged from the first heat exchanger to 20 ° C to 30 ° C. system.
<8> Further provided with a first discharge path for discharging the component separated from the gas by cooling the gas discharged from the discharge unit with the first heat exchanger <1> to <7. > The cooling system according to any one of.
<9> Further provided with a second discharge path for discharging the component separated from the gas by cooling the gas discharged from the first heat exchanger with the second heat exchanger <1. > The cooling system according to any one of <8>.
[0009]
<10> A separation method for separating the organic compound from a gas containing the organic compound using the cooling system according to any one of <1> to <9>.
<11> The organic compound is selected from 2,4-dimethyl-heptene, 2,6-dimethylnonane, propylene tetramer, propylene pentamer, their isomers, diacetylbenzene and di-tert-butylphenol. The separation method according to <10>, which comprises at least one species.
<12> The second heat exchanger is a orthogonal flow type heat exchanger, and the gas discharged from the first heat exchanger is cooled by the second heat exchanger to obtain the gas. The separation method according to <10> or <11>, wherein at least one of the organic compounds contained therein is attached to the gas flow path of the second heat exchanger and separated from the gas.
<13> The cooling system has a second discharge path for discharging components separated from the gas by cooling the gas discharged from the first heat exchanger with the second heat exchanger. After stopping the cooling of the gas in the second heat exchanger, the gas discharged from the first heat exchanger is supplied to the second heat exchanger to supply the second heat exchanger. The separation method according to <12>, wherein the organic compound adhering to the gas flow path of the heat exchanger is melted and the melted organic compound is discharged from the second discharge path.
<14> The cooling system has a second discharge path for discharging components separated from the gas by cooling the gas discharged from the first heat exchanger with the second heat exchanger. The gas discharged from the first heat exchanger after stopping the cooling of the gas in the first heat exchanger and the cooling of the gas in the second heat exchanger is further provided. 2. Described in <12>, wherein the organic compound supplied to the heat exchanger 2 and adhered to the gas flow path of the second heat exchanger is melted, and the melted organic compound is discharged from the second discharge path. Separation method.
The invention's effect
[0010]
　The present disclosure can provide a cooling system capable of suppressing clogging of a heat exchanger and efficiently separating and removing organic compounds in a gas discharged from a manufacturing unit that manufactures a non-woven fabric, and a separation method using the same. can.
A brief description of the drawing
[0011]
FIG. 1 is a schematic configuration diagram showing a cooling system according to an embodiment of the present invention.
Embodiment for carrying out the invention
[0012]
　Hereinafter, specific embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments, and the present invention is carried out with appropriate modifications within the scope of the object of the present invention. be able to.
　In the present disclosure, the numerical range represented by using "-" means a range including the numerical values ​​before and after "-" as the lower limit value and the upper limit value.
　In the numerical range described stepwise in the present disclosure, the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of the numerical range described in another stepwise description. .. Further, in the numerical range described in the present disclosure, the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
[0013]
[Cooling System]
　The cooling system of the present disclosure comprises a manufacturing unit that melt-kneads a polymer and spin-molds the melt-kneaded polymer to produce a non-woven fabric, and an organic compound generated when the polymer is melt-kneaded. From the first heat exchanger, which is arranged downstream of the discharge unit that discharges the contained gas, the first heat exchanger that cools the gas discharged from the discharge unit, and the first heat exchanger. A second heat exchanger for cooling the discharged gas and an exhaust unit for exhausting the gas discharged from the second heat exchanger to the outside of the system are provided.
[0014]
　When a polymer as a non-woven fabric raw material is melt-kneaded, a part of the non-woven fabric raw material may be decomposed, or the additive added at the time of melt-kneading may be decomposed or volatilized to generate a gas containing an organic compound. As a measure for the environment, it is necessary to separate and remove the organic compound from the gas containing the organic compound, and then exhaust the gas to the outside of the system. For example, as a method for separating and removing an organic compound, a gas containing the organic compound generated during the production of a non-woven fabric is supplied to a heat exchanger, and the gas is cooled by the heat exchanger to solidify or liquefy the organic compound. There is a method of separating and removing the compound.
[0015]
　However, when the organic compound in the gas is solidified or liquefied and separated and removed using a heat exchanger, the organic compound solidified by cooling adheres to the inside of the heat exchanger, for example, fins, and the heat exchanger is clogged. There is a risk. In order to prevent the heat exchanger from being clogged due to the heat exchange temperature dropping too low, it is necessary to reduce the amount of refrigerant such as cooling water to the heat exchanger to operate the heat exchanger. As a result, there is a problem that the organic compound is not sufficiently separated and removed by the heat exchanger, and the gas from which the organic compound is not sufficiently removed is exhausted to the outside of the system.
[0016]
　On the other hand, in the cooling system of the present disclosure, the gas containing an organic compound generated when the polymer is melt-kneaded is supplied in the order of the first heat exchanger and the second heat exchanger, and the second heat exchanger is supplied. Exhaust the gas discharged from the system to the outside of the system. In the cooling system of the present disclosure, since the organic compound is separated and removed by using at least two heat exchangers, the gas from which the organic compound is sufficiently separated and removed is suppressed while suppressing the clogging of the fins by the organic compound solidified by cooling. Can be discharged out of the system.
[0017]
　Hereinafter, an example of the cooling system of the present disclosure will be described with reference to FIG. FIG. 1 is a schematic configuration diagram showing a cooling system according to an embodiment of the present invention.
[0018]
　As shown in FIG. 1, the cooling system 100 includes a manufacturing unit 1 that melt-kneads a polymer and spin-molds the melt-kneaded polymer to produce a non-woven fabric, and an organic compound generated when the polymer is melt-kneaded. A first heat exchanger 2 for cooling the gas containing the above heat exchanger 2 and a second heat exchanger 3 for cooling the gas discharged from the first heat exchanger 2 are provided.
[0019]
　The manufacturing unit 1 may have a configuration in which a polymer is melt-kneaded and the melt-kneaded polymer is spun-molded to manufacture a nonwoven fabric. For example, a spunbonded nonwoven fabric manufacturing apparatus for manufacturing a nonwoven fabric by a spunbond method, melt blow. Examples thereof include a melt blown nonwoven fabric manufacturing apparatus that manufactures a nonwoven fabric by the method.
[0020]
　Examples of the spunbonded nonwoven fabric manufacturing apparatus include known manufacturing apparatus capable of forming a spunbonded nonwoven fabric. The spunbonded nonwoven fabric manufacturing apparatus includes, for example, an extruder for melt-kneading the resin composition, a spinning section provided with a plurality of spinning nozzles for discharging the melt-kneaded resin composition, and the resin composition being spun. A cooling section for cooling the long fibers, a stretched section for stretching the cooled long fibers, a mobile collecting section for depositing the stretched long fibers to form a non-woven fabric, and a heat-pressurizing treatment for the non-woven web. It may be configured to include an entangled portion.
[0021]
　Examples of the melt blow nonwoven fabric manufacturing apparatus include known manufacturing apparatus capable of forming a melt blow nonwoven fabric. As the melt blow nonwoven fabric manufacturing apparatus, for example, an extruder for melt-kneading the resin composition, a spinning section provided with a plurality of spinning nozzles for discharging the melt-kneaded resin composition together with a high-temperature gas, and a resin composition are spun. It may be configured to include a mobile collecting section for depositing the fibers.
[0022]
　The organic compound is not particularly limited as long as it is a compound generated when the polymer is melt-kneaded. For example, an organic compound generated by decomposing a part of a non-woven raw material and an additive added during melt-kneading are decomposed and volatilized. Examples thereof include organic compounds such as the above.
[0023]
　The organic compound may be a multimer generated by decomposition of a part of a polymer such as a propylene-based polymer as a raw material for a non-woven fabric. For example, 2,4-dimethyl-heptene, 2,6-dimethylnonane, etc. Examples thereof include propylene tetramer, propylene pentamer, and isomers thereof.
[0024]
　The organic compounds, other aforementioned compounds, diacetyl benzene, di -tert- butylphenol, palmitic acid, fatty acids such as stearic acid, fatty amides such as erucamide, dihydroxy-diisopropylbenzene, C 11 H 14 O 2 , Examples thereof include these isomers and modified products thereof.
　The organic compound may be one kind or two or more kinds.
[0025]
　The gas containing the organic compound discharged from the manufacturing unit 1 may further contain the organic compound generated other than when the polymer is melt-kneaded.
[0026]
　The gas containing the organic compound generated in the manufacturing unit 1 is discharged to the distribution channel 4 through the discharge unit, and is supplied to the first heat exchanger 2 through the distribution channel 4. The temperature of the gas containing the organic compound generated in the manufacturing unit 1 is not particularly limited, and may be, for example, 50 ° C to 100 ° C, 60 ° C to 80 ° C, or 70 ° C to 80 ° C. May be.
[0027]
　The first heat exchanger 2 is a device that cools a gas containing an organic compound supplied through a distribution channel 4 and separates and removes at least a part of the organic compounds in the gas.
[0028]
　Cooling water is supplied to the first heat exchanger 2 through the cooling water supply path 21, and the above-mentioned gas is cooled by heat exchange between the cooling water and the gas containing the organic compound. On-off valves 13 and 14 are provided in the cooling water supply path 21. The refrigerant for cooling the gas containing the organic compound is not limited to water, and any refrigerant may be used.
[0029]
　The first heat exchanger 2 may adjust the cooling of the gas containing the organic compound by adjusting the flow rate of the cooling water flowing through the cooling water supply path 21. The first heat exchanger 2 may cool, for example, a gas containing an organic compound to a temperature higher than 30 ° C and 50 ° C or lower. At this time, the cooling system 100 may include a control unit that regulates the cooling of the gas containing the organic compound. For example, the control unit cools the gas containing the organic compound to a temperature of more than 30 ° C. and 50 ° C. or lower. The flow rate of the cooling water supplied to the heat exchanger 2 of 1 may be controlled.
[0030]
　Further, in the first heat exchanger 2, for example, the gas containing the organic compound may be cooled to more than 30 ° C. and 40 ° C. or lower, and the control unit cools the gas containing the organic compound to more than 30 ° C. and 40 ° C. or lower. As described above, the flow rate of the cooling water supplied to the first heat exchanger 2 may be controlled.
[0031]
　The first heat exchanger 2 is not particularly limited as long as it is a known heat exchanger, and for example, a fin tube type heat exchanger, a plate fin type heat exchanger, a double tube heat exchanger, and a parallel flow type heat exchanger. Examples include exchangers, countercurrent heat exchangers, orthogonal flow heat exchangers and the like. The first heat exchanger 2 is preferably a fin tube heat exchanger because the flow rate at which the gas containing an organic compound can be processed is high. In order to increase the heat dissipation area, the fin tube heat exchanger is equipped with a heat dissipation tube that is processed by spirally winding fins (strip-shaped metal plate) around the outer circumference, and the refrigerant that cools the gas is supplied to the heat dissipation tube to dissipate heat. It is a heat exchanger that cools the gas supplied to the outer surface side of the pipe.
[0032]
　The cooling system 100 includes a first discharge path 23 for discharging the component separated from the gas by cooling the gas containing the organic compound in the first heat exchanger 2. The first discharge path 23 includes an on-off valve 17, and by opening the on-off valve 17, components separated from the gas containing an organic compound can be discharged.
[0033]
　For example, diacetyl benzene which may be included in the gas containing the organic compound from the first discharge path 23, C 11 H 14 O 2 , di -tert- butylphenol can be suitably discharged.
[0034]
　The gas cooled by the first heat exchanger 2 is discharged to the distribution channel 6. The distribution path 6 is a path connecting the downstream side of the first heat exchanger 2 and the upstream side of the second heat exchanger 3. Drive the pump 5 provided in the flow path 6, open the upstream and downstream sides of the flow path 6 of the three-way valve 11 (switching section), and connect the upstream and downstream sides of the second heat exchanger 3. By closing the bypass path 7 side, which is a path, the gas cooled by the first heat exchanger 2 is supplied to the second heat exchanger 3 through the flow path 6.
[0035]
　On the other hand, the pump 5 was driven, the downstream side of the flow path 6 of the three-way valve 11 was closed, and the upstream side of the flow path 6 and the bypass path 7 side were opened, so that the heat exchanger 2 was cooled. The gas is supplied to the bypass path 7. By adjusting the opening and closing of the three-way valve 11, it is possible to switch whether or not the gas discharged from the first heat exchanger 2 is supplied to the second heat exchanger 3.
[0036]
　The second heat exchanger 3 is a device that cools the gas supplied through the distribution channel 6 and separates and removes organic compounds in the gas.
[0037]
　Cooling water is supplied to the second heat exchanger 3 through the cooling water supply path 22, and the gas is cooled by heat exchange between the cooling water and the gas. On-off valves 15 and 16 are provided in the cooling water supply path 22. The refrigerant for cooling the gas is not limited to water, and any refrigerant may be used. The cooling water supply path 22 is connected to the cooling water supply path 21 on the downstream side of the second heat exchanger 3, and the cooling water discharged from the second heat exchanger 3 passes through the cooling water supply path 21. It may be configured to be supplied to the first heat exchanger 2.
[0038]
　The second heat exchanger 3 may adjust the cooling of the gas by adjusting the flow rate of the cooling water flowing through the cooling water supply path 22. The second heat exchanger 3 may cool the gas to, for example, 20 ° C to 30 ° C. At this time, the cooling system 100 may include a control unit that regulates the cooling of the gas, and the control unit is supplied to the second heat exchanger 3 so as to cool the gas to 20 ° C. to 30 ° C. or lower. The flow rate of cooling water and the like may be controlled.
[0039]
　Further, the second heat exchanger 3 may, for example, cool the gas to 20 ° C. to 25 ° C., and the second heat exchanger 3 may have the control unit cool the gas to 20 ° C. to 25 ° C. The flow rate of the supplied cooling water may be controlled.
[0040]
　The second heat exchanger 3 is not particularly limited as long as it is a known heat exchanger, for example, a fin tube type heat exchanger, a plate fin type heat exchanger, a double tube heat exchanger, and a parallel flow type heat exchanger. Examples include exchangers, countercurrent heat exchangers, orthogonal flow heat exchangers and the like. The second heat exchanger 3 is preferably a orthogonal flow type heat exchanger from the viewpoint of preferably suppressing clogging in the first heat exchanger 2 and preferably separating and removing organic compounds in the gas. As a orthogonal flow type heat exchanger, for example, a plurality of heat dissipation pipes are provided in one direction, a refrigerant for cooling gas is supplied into these heat radiation pipes, and the outer surface side of the heat radiation pipe is provided from a direction orthogonal to the axis direction of the heat radiation pipe. It is a heat exchanger that cools the gas supplied to the. The heat dissipation tube in the orthogonal flow heat exchanger may have a spiral flow path.
[0041]
　The cooling system 100 includes a second discharge path 24 that discharges a component separated from the above-mentioned gas by cooling the gas discharged from the first heat exchanger 2 with the second heat exchanger 3. ing. The second discharge path 24 includes an on-off valve 18, and by opening the on-off valve 18, the components separated from the gas can be discharged.
[0042]
　For example, diacetyl benzene from the second discharge path 24, C 11 H 14 O 2 , di -tert- butylphenol can be suitably discharged.
[0043]
　The gas cooled by the second heat exchanger 3 is discharged to the distribution channel 8. By opening the upstream side and the downstream side of the flow path 8 of the three-way valve 12 and closing the bypass path 7 side, the gas cooled by the second heat exchanger 3 is exhausted from the exhaust portion through the flow path 8. ..
[0044]
　On the other hand, when the gas discharged from the first heat exchanger 2 is not supplied to the second heat exchanger 3, the upstream side of the flow path 8 of the three-way valve 12 is closed, and the bypass path 7 side and the flow path are closed. By opening the downstream side of 8, the gas supplied to the bypass path 7 is exhausted from the exhaust section through the flow path 8.
[0045]
[Separation Method]
　The separation method of the present disclosure is a method of separating an organic compound from a gas containing an organic compound by using the cooling system of the present disclosure described above. As an example of the separation method of the present disclosure, the method using the cooling system 100 described above will be described below.
[0046]
　In the separation method of the present disclosure, the gas discharged from the first heat exchanger 2 is cooled by the second heat exchanger 3 to heat at least one of the organic compounds contained in the gas to the second heat. It is preferable to attach it to the gas flow path of the exchanger 3 and separate it from the gas. At this time, the second heat exchanger 3 is a orthogonal flow type heat exchanger from the viewpoint of adhering many organic compounds to the gas flow path and separating them from the gas while suppressing clogging of the second heat exchanger 3. Is preferable.
[0047]
　Further, in the separation method of the present disclosure, a treatment for melting the organic compound adhering to the gas flow path of the second heat exchanger 3 may be performed.
[0048]
　For example, after closing the on-off valve 15 to stop the supply of cooling water to the second heat exchanger 3 to stop the cooling of the gas in the second heat exchanger 3, the heat exchanger 2 discharges from the first heat exchanger 2. The generated gas may be supplied to the second heat exchanger 3. As a result, the organic compound adhering to the gas flow path of the second heat exchanger 3 can be melted, and the melted organic compound can be discharged from the second discharge path 24.
[0049]
　Further, the on-off valve 13 is closed to stop the supply of cooling water to the first heat exchanger 2, and the on-off valve 15 is closed to stop the supply of cooling water to the second heat exchanger 3. After stopping the cooling of the gas in the heat exchanger 2 of 1 and the cooling of the gas in the second heat exchanger 3, the gas discharged from the first heat exchanger 2 is supplied to the second heat exchanger 3. You may. As a result, the organic compound adhering to the gas flow path of the second heat exchanger 3 can be melted, and the melted organic compound can be discharged from the second discharge path 24, and further, the second heat exchanger 3 can be discharged. The organic compound having a higher melting point attached to the gas flow path can be melted and removed from the gas flow path as compared with the case where only the cooling of the gas is stopped.
[0050]
　Further, when the on-off valve 15 is closed to stop the supply of cooling water to the second heat exchanger 3 and the cooling of the gas in the second heat exchanger 3 is stopped, the heat exchanger 3 is supplied. There is a possibility that the organic compounds in the gas are hardly removed and are discharged from the second heat exchanger 3. In this case, the cooling system 100 is configured to recover the gas exhausted to the outside of the system from the exhaust unit, further provides another path in the distribution path 8, and the gas discharged from the second heat exchanger 3 is further provided in the other path. It may be provided with a configuration in which the gas is supplied and the gas is recovered or processed.
Example
[0051]
　Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples as long as the gist of the present invention is not exceeded.
[0052]
[Example 1]
　Using the cooling system shown in FIG. 1, an organic compound is obtained from a gas containing an organic compound generated when a propylene-based polymer which is a raw material for a non-woven fabric is melt-kneaded, using the following heat exchanger. Separation was performed under the following conditions.
(1st heat exchanger and 2nd heat exchanger)
　1st heat exchanger: Fin tube type heat exchanger
　2nd heat exchanger: Multi-tube orthogonal type heat exchanger (manufactured by Maeda Iron Works, tube: Tavilent tube (spiral), heat transfer area: 6.44 m 2 , heat exchange amount: 6.41 kW)
(Gas supply and cooling water temperature conditions)
　Gas temperature containing organic compounds: 70 ° C in a
　cooling system Gas flow rate: 25 m 3 / min (supplied for 1 hour)
　Temperature of cooling water supplied to the first heat exchanger: 16 ° C Temperature of cooling water supplied to
　the second heat exchanger: 8 ° C
[0053]
　When the organic compound was separated from the gas containing the organic compound under the above conditions for the gas supply and the temperature condition of the cooling water, the temperature of the gas discharged from the first heat exchanger and the second heat exchanger, and The temperatures of the cooling water discharged from the first heat exchanger and the second heat exchanger were as follows.
(Temperature of gas and cooling water)
　Temperature of gas discharged from the first heat exchanger: 35 ° C Temperature of gas discharged from
　the second heat exchanger: 25 ° C
　Discharged from the first heat exchanger Cooling water temperature: 22 ° C Temperature of cooling water
　discharged from the first heat exchanger: 10 ° C
[0054]
　Next, a liquid organic compound condensed and recovered in the gas flow path of the first heat exchanger, a solid organic compound adhering to the gas flow path of the second heat exchanger, and a second heat. The components of the liquid organic compound condensed and recovered in the gas flow path of the exchanger were analyzed using a gas chromatograph mass analyzer (manufactured by Azilent Technology, trade name GC-MSHP-6973). The components estimated from each peak and their peak area percentages are shown in Tables 1 and 2 below. Table 1 shows the analysis results of the organic compounds separated by the first heat exchanger, and Table 2 shows the analysis results of the organic compounds separated by the second heat exchanger.
[0055]
[table 1]

[0056]
[Table 2]

[0057]
　As shown in Tables 1 and 2, the organic compound could be separated from the gas containing the organic compound by using the cooling system of this example.
[0058]
[Comparative Example 1] The same
　system as the cooling system of Example 1 was used except that the second heat exchanger was not provided as the heat exchanger and only the first heat exchanger was provided.
[0059]
　Using the cooling systems of Example 1 and Comparative Example 1, the organic compound was separated from the gas containing the organic compound under the above-mentioned conditions, and a part of the gas discharged to the outside of the system was recovered and contained in the discharged gas. The possible diacetylbenzene was collected in a collection tube (silica gel) and a collection tube (TENAX), and the amounts thereof were compared.
　The results are shown in Table 3.
[0060]
[Table 3]

[0061]
　As shown in Table 3, in Example 1, the amount of diacetylbenzene that can be contained in the discharged gas is smaller than that in Comparative Example 1, regardless of the type of the collection tube. It could be removed suitably.
Code description
[0062]
　1 ... Manufacturing unit, 2 ... 1st heat exchanger, 3 ... 2nd heat exchanger, 4, 6, 8 ... Distribution route, 5 ... Pump, 7 ... Bypass route, 11, 12 ... Three-way valve (switching unit) ), 13-18 ... On-off valve, 21, 22 ... Cooling water flow path, 23 ... First discharge path, 24 ... Second discharge path
The scope of the claims
[Claim 1]
　Melting and kneading a polymer, and a manufacturing unit for manufacturing nonwoven by spinning molding the melt-blended polymer,
　occurs when the melt-kneading the polymer, and a discharge portion for discharging the gas containing the organic compound,
　the discharge A first heat exchanger that cools the gas discharged from the unit and a
　second heat exchanger that is arranged downstream of the first heat exchanger and cools the gas discharged from the first heat exchanger. A cooling system including a heat exchanger and
　an exhaust unit for exhausting the gas discharged from the second heat exchanger to the outside of the
　system.
[Claim 2]
　The cooling system according to claim 1, wherein the first heat exchanger is a fin tube type heat exchanger.
[Claim 3]
　The cooling system according to claim 1 or 2, wherein the second heat exchanger is a orthogonal flow type heat exchanger.
[Claim 4]
　A path connecting the downstream side of the first heat exchanger and the upstream side of the second heat exchanger, and connecting the downstream side of the second heat exchanger and the exhaust portion, and the
　path in the path.
　It is possible to switch between a bypass path connecting the upstream side and the downstream side of the second heat exchanger and whether or not to supply the gas discharged from the first heat exchanger to the second heat exchanger.
　The cooling system according to any one of claims 1 to 3, further comprising a switching unit .
[Claim 5]
　The organic compound is at least one selected from 2,4-dimethyl-heptene, 2,6-dimethylnonane, propylene tetramer, propylene pentamer, isomers thereof, diacetylbenzene and di-tert-butylphenol. The cooling system according to any one of claims 1 to 4, comprising the above.
[Claim 6]
　6. Cooling system.
[Claim 7]
　The cooling system according to claim 6, wherein the control unit controls the second heat exchanger to cool the gas discharged from the first heat exchanger to 20 ° C to 30 ° C.
[Claim 8]
　Any of claims 1 to 7, further comprising a first discharge path for discharging the component separated from the gas by cooling the gas discharged from the discharge unit with the first heat exchanger. The cooling system according to claim 1.
[Claim 9]
　Claims 1 to claim further include a second discharge path for discharging a component separated from the gas by cooling the gas discharged from the first heat exchanger with the second heat exchanger. Item 8. The cooling system according to any one of items 8.
[Claim 10]
　A separation method for separating an organic compound from a gas containing the organic compound by using the cooling system according to any one of claims 1 to 9.
[Claim 11]
　The organic compound is at least one selected from 2,4-dimethyl-heptene, 2,6-dimethylnonane, propylene tetramer, propylene pentamer, isomers thereof, diacetylbenzene and di-tert-butylphenol. 10. The separation method according to claim 10.
[Claim 12]
　The second heat exchanger is a orthogonal flow type heat exchanger, and the gas discharged from the first heat exchanger is contained in the gas by cooling with the second heat exchanger. The separation method according to claim 10 or 11, wherein at least one of the organic compounds is attached to the gas flow path of the second heat exchanger and separated from the gas.
[Claim 13]
　The cooling system further comprises a second discharge path for discharging components separated from the gas by cooling the gas discharged from the first heat exchanger with the second heat exchanger. ,
　after stopping the cooling of the gas in the second heat exchanger, and supplying the gas discharged from the first heat exchanger to said second heat exchanger, the second heat exchanger The separation method according to claim 12, wherein the organic compound adhering to the gas flow path of No. 12 is melted, and the melted organic compound is discharged from the second discharge path.
[Claim 14]
　The cooling system further comprises a second discharge path for discharging components separated from the gas by cooling the gas discharged from the first heat exchanger with the second heat exchanger. ,
　wherein after stopping the cooling of the gas in the cooling and the second heat exchanger of the gas in the first heat exchanger, the second heat the gas discharged from the first heat exchanger The separation method according to claim 12, wherein the organic compound supplied to the exchanger, melted in the gas flow path of the second heat exchanger, and the melted organic compound is discharged from the second discharge path.