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Title:
PROCESS FOR PURIFYING 4,4'-DIHYDROXYDIPHENYL SULFONE
Document Type and Number:
WIPO Patent Application WO/1989/001469
Kind Code:
A1
Abstract:
This invention provides a process for purifying 4,4'-dihydroxydiphenyl sulfone, which comprises dissolving crude 4,4'-dihydroxydiphenyl sulfone in an aqueous solution of a basic substance, conducting salting out to precipitate and separate 4,4'-dihydroxydiphenyl sulfone mono-salt, and treating it with an acid. It also provides a process for preparing 4,4'-dihydroxydiphenyl sulfone mono-salt, which comprises dissolving crude 4,4'-dihydroxydiphenyl sulfone in an aqueous solution of a basic substance and conducting salting out to precipitate and separate 4,4'-dihydroxydiphenyl sulfone mono-salt.

Inventors:
Ogata
Eiji, Ono
Koji
Application Number:
PCT/JP1988/000813
Publication Date:
February 23, 1989
Filing Date:
August 17, 1988
Export Citation:
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Assignee:
KONISHI CHEMICAL INDUSTRY
LIMITED OGATA
Eiji, Ono
Koji
International Classes:
C07C315/06; C07C317/22; C07C317/24; (IPC1-7): C07C147/10
Foreign References:
JPS6293271A
US3297766A
US4162270A
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