PROCESS FOR RECOVERY OF 1,4-DICHLOROBUTENE-2 Russian patent published in 1999 - IPC

FIELD: organic chemistry. SUBSTANCE: present invention describes process for recovering 1,4-dichlorobutene-2 from mixture of C₄ chlorohydrocarbons prepared by liquid phase chlorination of butadiene. Mixture of C₄ dichlorobutenes comprising substantially dichlorobutenes and trichlorobutenes is subjected to selective aqueous alkali dehydrochlorination with 30-46% aqueous NaOH at 13-20 C in ethyl chloride using catalyst system consisting of trialkyl-1-chlorobuten-2-yl ammonium chloride and alcoholic component which includes C₁-C₄ alcohol, or benzyl alcohol, or 1,4-butenediol. Catalyst system is prepared directly in admixture with C₄- chlorohydrocarbons to be dehydrochlorinated. Improved process makes it possible to recover 1,4-dichlorobutene- 2-without prerectification of mixture of C₄- chlorohydrocarbons. EFFECT: more efficient recovery process. 3 cl, 5 ex