Process for the production of aromatic polycarboxylic acids

Details Process for the production of aromatic polycarboxylic acids Process for the production of aromatic polycarboxylic acids

1985-10-23

1988-01-12

Lone, Werren B.

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

Organic compounds

Carboxylic acids and salts thereof

562416, C07C 5121

Patent

active

047193115

ABSTRACT:
A process for the manufacture of polycarboxylic acids having at least three carboxylic acid groups for each benzene ring is disclosed. In this novel process, water is used in the last third of the reaction to improve the yield of cobalt-manganese-bromine or oxidation system and eliminate catalyst deactivation. Polycarboxylic acids such as durene are converted to pyromellitic acid which is used to manufacture a polyimide ring used as molding compounds for replacement of metals.

REFERENCES:
patent: 4197412 (1980-04-01), Kimura et al.
patent: 4230882 (1980-10-01), Seko et al.
patent: 4299977 (1981-11-01), Kuhlmann et al.

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