Process for separating dichlorodiphenylsulfone isomers

Details Process for separating dichlorodiphenylsulfone isomers Process for separating dichlorodiphenylsulfone isomers

1988-08-19

1989-10-24

Ceperley, Mary E.

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

Organic compounds

Sulfur containing

210674, C07C14706

Patent

active

048763900

ABSTRACT:
A process for the liquid phase adsorptive separation of 4,4'-dichlorodiphenylsulfone (4,4'-DCDPS) from crystallization residue feed mixture also containing other DCDPS isomers. The feed is contacted with an X or Y type zeolite, substituted with a cation of a Group IA or IIA metal or ammonium. The other isomers are selectively adsorbed to the substantial exclusion of 4,4'-DCDPS. The 4,4'-DCDPS is recovered in high purity by fractionating the raffinate to recover the desorbent, aliphatic alcohols having 4-8 carbon atoms either used alone or diluted with an aromatic compound.

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