METHOD OF SEPARATING AND RECOVERING ALKENYLBENZENES AND UNREACTED ALKYLBENZENES FROM THE ALKENYLATION REACTION PRODUCT

摘要

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 distillation zone at which said alkenylation reaction product liquid is separated by distillation to recover an alkenylbenzene-con-taining fraction and an unreacted alkylbenzene-containing fraction, 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 milligram 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.