Method for purifying a crude diphenylsulfone tetracarboxylic aci

Details Method for purifying a crude diphenylsulfone tetracarboxylic aci Method for purifying a crude diphenylsulfone tetracarboxylic aci

1988-09-16

1990-04-03

Shippen, Michael L.

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

Organic compounds

Carboxylic acids and salts thereof

562430, C07C 5143

Patent

active

049142313

ABSTRACT:
Disclosed is a method for purifying a crude diphenylsulfone tetracarboxylic acid which comprises the steps of dissolving a crude diphenyolsulfone tetracarboxylic acid in a solvent mixture of water and acetic acid and recrystallizing the crude to obtain a highly purifed diphenylsulfone tetracarboxylic acid.

REFERENCES:
patent: 3504022 (1970-03-01), Bresson
patent: 4287366 (1981-09-01), Yamaguchi et al.
patent: 4445124 (1984-04-01), Fujii
patent: 4827029 (1989-05-01), Kleeman
patent: 4855218 (1989-08-01), Fujita
Chelates in Analytical Chemistry, vol. 1, Ed. by H. A. Flaschka and A. J. Barnard, Jr., Marcell Dekker, Inc., New York, 1967, pp. 49-79 and 291-292.

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