FORM 2
THE PATENTS ACT 70
( ACT 39 of 70 )
COMPLETE SPECIFICATION (See Section 10 )
A Process for recovering organic chemicals from chlorinated organic effluent emanating from Chloroprene manufacturing process
PIDILITE INDUSTRIES LIMITED, A COMPANY REGISTERED UNDER THE
INDIAN COMPANIES ACT 1956 HAVING ITS REGISTERED OFFICE LOCATED AT REGENT CHAMBERS, NARIMAN POINT, MUMBAI - 400021,
MAHARASHTRA, INDIA.
The following specification describes the nature of the invention and the manner in which it is to be performed description

• Field of Invention
The invention relates to a process a process for recovering organic chemicals from chlorinated organic effluent emanating from Chloroprene manufacturing process The process of present invention is particularly useful for recovery of valuable organic chemicals from chlorinated organic effluent emanating from chloroprene manufacturing process before incineration or any other effluent treatment process. The present invention particularly relates to the recovery of 3,4-dichlorobutne-1, 1 -chloro 1,3-Butadiene, Vinyl cyclohexene and , Butoxy ethanol from the effluent containing them emanating from chloroprene manufacturing process .
The recovered 1-Chloro butadiene , if desired , can be used for producing new copolymer with chloroprene.
The recovered Chloroprene , if desired can be recycled back to polymerization process for converting chloroprene into Polychloroprene rubber.
The recovered 3,4 Dichlorobutene-1 if desired can be recycled back to dehydrochlorination process.
The recovered Butoxy ethanol if desired can be recycled back to Dehydrochlorination process.
The recovered Vinyl Cyclohexene if desired can be converted to vinyl cyclohexene diepoxide.
The recovered Heavy fractions can be incinerated.
• Background of Invention
During chloroprene manufacturing process, organic chlorinated effluent is generated from Dehydrochlorination section of the process . Dehydrochlorination is the process in which 3,4 Dichlorobutene-1 is reacted with Sodium hydroxide to produce Chloroprene. While producing chloroprene, the chlorinated organic effluent is generated. This '

chlorinated organic effluent contains 3,4-dichlorobutene-1, 1-chloro 1,3-butadiene, Vinyl cyclohexene, Butoxy ethanol, chloroprene and water, dimers & heavy fractions among others. Water content is 1-2%. Dimers include 1-Chloro,3-Chlorovinyl,Cyclohexene-6, 1-Chloro,4-Chlorovinyl, Cyclohexene-6, 1,3-dichloro,3 vinyl, cyclohexene-6 and 1,4-dichloro,3 vinyl, cyclohexene. Heavy fractions include Monoethers and Diethers.
The normal boiling point of components in Chlorinated Organic Effluent ranges from 59.4°C to 272.2°C. The lighter components, Chloroprene (N.B.P. = 59.4°C) to Vinyl Cyclohexene (N.B.P. = 127.9°C), constitute 47% of Chlorinated Organic (Wet) Effluent, while the heavier components constitute remaining 53%.
• Prior Art
To the best of our knowledge there is no process is available in the prior art for the recovery of organic chemicals from the effluent of Chloroprene manufacturing process
Normally such effluents are treated by incineration process which results in the loss of valuable organic chemicals. If a process developed wherein these valuable organic chemicals are recovered , there will be value addition to the process The value addition will be enhanced when the chemical so recovered are used for various purposes .
• Objectives of the present invention
Therefore the main objective of the present invention is to recover valuable organic chemicals from the effluent of chloroprene manufacturing process
Another objective of the present invention is to recover 3,4-dichlorobutne-1, 1-chloro 1,3-Butadiene, Vinyl cyclohexene and , Butoxy ethanol from the effluent of chloroprene manufacturing process
Yet another objective of the present invention is to recover individually 3,4-dtchlorobutne-1, 1-chloro 1,3-Butadiene, Vinyl cyclohexene and , Butoxy ethanol from

the effluent of chloroprene manufacturing process which can be used for various purposes
According to the present invention , Organic chemicals (Chloroprene, 1-Chloro butadiene, 3,4 Dichlorobutene-1 and Vinyl cyclohexene, Butoxy ethanol) which are present in chlorinated organic effluent coming out of chloroprene manufacturing can be recovered individually by using series of distillation columns as shown in figure 1 of the drawing accompanying this specification.
• Summary of Invention
Accordingly, the present invention provides a process for the recovery of 3,4-dichlorobutne-1, 1-chloro 1,3-Butadiene, Vinyl cyclohexene and , Butoxy ethanol from the chlorinated organic effluent emanating from chloroprene manufacturing process which comprises
(i) Passing the effluent containing lighter components comprising Chloroprene, 1-Chloro 1,3-Butadiene, Water, 3,4-Dichlorobutene-l and Vinyl cyclohexene and heavier components comprising Butoxy ethanol, Dimers and Heavy fractions in a first distillation column ( 1 ) , the column having a number of theoretical stages in the range of 5-20 and with random dumped packings, reflux ratio (being in the range of 0.1-0.5 and the temperature at the bottom of the column being in the range of 100-150 Deg.C , the pressure at the top of the column being in the range of 5-50 mm Hg absolute ,
(ii) Recovering , Chloroprene, 1-Ch!oro butadiene, 3,4-Dichlorobutene-1 and Vinyl cyclohexene along with water coming out from the top of the first distillation column (1 ), separating water from Chloroprene & 1-Chloro butadiene, 3,4-Dichlorobutene-1 and Vinyl cyclohexene by decanting
(iii) Passing the fraction containing 3,4-dichlorobutne-l, Vinyl cyclohexene , Chloroprene and 1-Chloro butadiene to a second distillation column (2), this column having a number of theoretical stages in the range of 5-20 and with random dumped packings, reflux ratio is maintained in the range of 0.2-1 and column bottom temperature is in the range of 60-100 Deg.C with column top pressure at 50-100 mm Hg absolute.