Process for producing mixture of dihydroxydiphenylsulfone...

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

2005-11-15

2005-11-15

Richter, Johann (Department: 1621)

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

Organic compounds

Sulfur containing

Reexamination Certificate

active

06965054

ABSTRACT:
The present invention provides a process for producing a mixture of dihydroxydiphenylsulfone isomers containing 2,4′-dihydroxydiphenylsulfone, the process comprising heating 4,4′-dihydroxydiphenylsulfone or a mixture of dihydroxydiphenylsulfone isomers containing at least 85 wt. % of 4,4′-dihydroxydiphenylsulfone in the presence of phenol and sulfuric or sulfonic acid.

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Yoshihiro Yoshii, et al., “Isomer Distribution in Sulfonation and p-Hydroxyphenylsulfonylation of Phenol,” Journal of the Chemical Society of Japan, 1985 (1), pp. 70-74.

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