PROCESS FOR PRODUCING 2,4'-DIHYDROXYDIPHENYL SULFONE

A process for producing 2,4'-dihydroxydiphenylsulfone which comprises separating 4,4'-dihydroxydiphenylsulfone by crystallization from a mixture containing 4,4'-dihydroxydiphenylsulfone, 2,4'-dihydroxydiphenylsulfone, phenolsulfonic acid and phenol which is obtained by dehydratio...

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Bibliographic Details
Main Authors HASEGAWA, TAKEO, TANIGUCHI, NORIHIRO, IGARASHI, KAZUAKI, YOSHINO, GOU, TOMODA, YUICHI
Format Patent
LanguageEnglish
French
German
Published 03.05.2006
Edition7
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:A process for producing 2,4'-dihydroxydiphenylsulfone which comprises separating 4,4'-dihydroxydiphenylsulfone by crystallization from a mixture containing 4,4'-dihydroxydiphenylsulfone, 2,4'-dihydroxydiphenylsulfone, phenolsulfonic acid and phenol which is obtained by dehydration of phenol and sulfuric acid or phenolsulfonic acid to obtain a mixture having a content of 2,4'-dihydroxydiphenylsulfone greater than the content of 4,4'-dihydroxydiphenylsulfone, crystallizing 2,4'-dihydroxydiphenylsulfone by adjusting the composition of the solvent of the obtained mixture so that the ratio of the amounts by weight of phenol to water is 10:90 to 90:10, and separating 2,4'-dihydroxydiphenylsulfone by filtration; and a process as described above in which the filtrate obtained by the filtration is used as the raw material for the hydration.
Bibliography:Application Number: EP20030731628