Method of separating and recovering alkenylbenzenes and...

C - Chemistry – Metallurgy – 07 – C

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260/715.9

C07C 2/00 (2006.01) B01J 23/04 (2006.01) C07C 7/04 (2006.01)

Patent

CA 1049570

ABSTRACT OF THE DISCLOSURE In the method wherein an alkenylation reaction product liquid obtained by the alkenylation reaction of an alkylbenzene and a C4-C5 conjugated diene in the presence of alkali metal catalysts and containing unreacted alkylbenzene, alkali metal catalysts and organo-alkali metal compounds is conveyed to a dis- tillation zone at which said alkenylation reaction product liquid is separated by distillation to recover an alkenylbenzene-con- taining fraction and an unreacted alkylbenzene-containing frac- tion, the improvement which comprises adjusting the total of the concentrations of said alkali metal catalysts and organo-alkali metal compounds in said alkenylation reaction product liquid introduced to the distillation zone so as to be 0.09 - 15 milli- gram atoms per kilogram or said product liquid, calculated as alkali metal atoms, and thereafter conducting the distillation of said product liquid under conditions of non-addition of alcohols.

228330

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