Process for producing dihydroxydiphenylsulfone

Details Process for producing dihydroxydiphenylsulfone Process for producing dihydroxydiphenylsulfone

2005-12-13

2005-12-13

Richter, Johann (Department: 1621)

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

Organic compounds

Sulfur containing

Reexamination Certificate

active

06974886

ABSTRACT:
The present invention provides a process for producing dihydroxydiphenylsulfone wherein trihydroxytriphenylsulfone and coloring impurities are effectively removed without altering the isomeric composition of dihydroxydiphenylsulfone. In particular, the present invention provides a process for producing dihydroxydiphenylsulfone comprising the steps of dissolveing or suspending in an aqueous solvent crude dihydroxydiphenylsulfone containing trihydroxytriphenylsulfone, adjusting the pH to 5–7, optionally cooling, and separating the crystalline dihydroxydiphenylsulfone thus precipitated.

REFERENCES:
patent: 6700020 (2004-03-01), Pabst et al.
patent: 0 220 855 (1987-05-01), None
patent: 10 - 27277 (1998-01-01), None
patent: 10 - 139756 (1998-05-01), None
patent: WO 2001079163 (2001-10-01), None

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