Process for producing a high purity 2,4-dihydroxydiphenylsulfone

Details Process for producing a high purity 2,4-dihydroxydiphenylsulfone Process for producing a high purity 2,4-dihydroxydiphenylsulfone

1996-01-17

1998-06-16

Rotman, Alan L.

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

Organic compounds

Sulfur containing

C07C31506

Patent

active

057673187

ABSTRACT:
A process for producing a high purity 2,4'-dihydroxydiphenylsulfone (2,4'-isomer) comprising separating 2,4'-isomer from 4,4'-dihydroxydiphenylsulfone (4,4'-isomer) by adding a hydroxide of an alkali metal in an amount which is the total of an amount by mol 1.6 to 2.2 times as great as the amount by mol of 2,4'-isomer and an amount by mol 0.8 to 1.2 times as great as the amount by mol of 4,4'-isomer to a solution of a mixture of 2,4'-isomer and 4,4'-isomer containing 15% by weight or more of 2,4'-isomer in water, to allow 2,4'-isomer to remain dissolved in water in the form of a dialkali metal salt thereof and 4,4'-isomer to be precipitated from the solution in the form of a monoalkali metal salt thereof. A carbonate of an alkali metal may also be used. In order to accelerate the operation, an excess amount of the alkali may be added, which is subsequently neutralized. A high purity 2,4'-isomer having a purity of 95 to 99.5% by weight can be obtained easily with a high yield from a mixture of the isomers containing 15% by weight or more of 2,4'-isomer.

REFERENCES:
patent: 2392137 (1946-01-01), Foster
patent: 5001270 (1991-03-01), Zemlanicky et al.
patent: 5097074 (1992-03-01), Ogata et al.
patent: 5378674 (1995-01-01), Kobayashi et al.

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