Process for making 4,4'-dihydroxydiphenyl sulfone

Details Process for making 4,4'-dihydroxydiphenyl sulfone Process for making 4,4'-dihydroxydiphenyl sulfone

1989-12-20

1991-02-26

Ceperley, Mary E.

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

Organic compounds

Sulfur containing

C07C31500

Patent

active

049963678

ABSTRACT:
A process is described to make a dihydroxydiphenol sulfone product with a 4,4'-dihydroxydiphenol sulfone purity in excess of 90 wt. % by reaction of phenol and concentrated sulfuric acid in a solvent mixture containing a lower-boiling and a higher-boiling hydrocarbon, removal by azeotropic distillation of water, hydrocarbon, and phenol, phase separation of the distillate, and return of at least the phenol to the reaction at a rate which maintains a phenol to sulfuric acid mol ratio in the reaction of at least 2 to 1.

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patent: 2833828 (1958-05-01), Sauls
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patent: 4113974 (1978-09-01), Mark et al.
patent: 4162270 (1979-07-01), Ogata et al.
patent: 4382147 (1983-05-01), Kitamura et al.
patent: 4820831 (1989-04-01), Ogata et al.
Derwent Abstract of Japanese Patent 51-98239, published Aug. 1976.
J. Chem. Soc. 2854-6 (1949), S. E. Hinkel and G. H. R. Summers.
Abstract of Japanese Patent 43-24660, published May 1966.
Abstract of Japanese Patent 47-43936, published Nov. 1972.

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