Method for recovering trans-1,2-dichloroethene

Details Method for recovering trans-1,2-dichloroethene Method for recovering trans-1,2-dichloroethene

2007-09-11

2007-09-11

Page, Thurman K. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

C570S202000, C570S216000, C570S235000, C570S256000

Reexamination Certificate

active

10834408

ABSTRACT:
Describes a method for recovering trans-1,2-dichloroethene from a liquid feed composition comprising both the cis-and trans-isomers of 1,2-dichloroethene and contaminating amounts of other chlorinated hydrocarbons, e.g., lower alkyl chlorinated hydrocarbons, such as C1-C2chlorinated hydrocarbons. In one of the described methods, the liquid feed composition is introduced into a first distillation column10wherein the stereoisomers and chlorinated hydrocarbons more volatile than the stereoisomers are removed as overhead12and charged to a second distillation column20. In column20, the stereoisomers are separated from the more volatile chlorinated hydrocarbons, and a bottoms fraction24comprising the stereoisomers is charged to a reactive distillation column30wherein the cis-isomer is isomerized to the trans-isomer in the liquid phase and in the presence of an organic free-radical initiator, e.g., an azonitrile initiator. Substantially pure trans 1,2-dichloroethene is recovered as overhead 32 from reactive distillation column30.

REFERENCES:
patent: 3914167 (1975-10-01), Ivy et al.
patent: 4781807 (1988-11-01), Clark, Jr. et al.
patent: 5051536 (1991-09-01), Gorton et al.
patent: WO91/02708 (1991-03-01), None

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