Process for producing mixture of dihydroxydiphenylsulfone...

Details Process for producing mixture of dihydroxydiphenylsulfone... Process for producing mixture of dihydroxydiphenylsulfone...

2005-03-01

2005-03-01

Richter, Johann (Department: 1621)

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

Organic compounds

Sulfur containing

C568S018000, C568S027000

Reexamination Certificate

active

06861562

ABSTRACT:
The present invention provides a process for producing a mixture of 4,4′- and 2,4′-dihydroxydiphenylsulfones comprising heating trihydroxytriphenyldisulfone or a mixture of dihydroxydiphenylsulfone isomers containing trihydroxytriphenyldisulfone in the presence of phenol and an acid catalyst.

REFERENCES:
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patent: 50-116446 (1975-09-01), None
patent: 10-25277 (1998-01-01), None
patent: 10-139756 (1998-05-01), None

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