Process for manufacturing 5-hydroxyisophthalic acid

Details Process for manufacturing 5-hydroxyisophthalic acid Process for manufacturing 5-hydroxyisophthalic acid

1994-10-04

1995-05-16

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5116

Patent

active

054162564

ABSTRACT:
An improved process for manufacturing 5-hydroxyisophthalic acid by means of oxidizing 5-acyloxy-m-xylene or its oxidation intermediate with molecular oxygen in a solvent consisting of lower aliphatic carboxylic acid and acetic anhydride in the presence of catalyst consisting of heavy metal comprising cobalt as the main component, and a bromine compound, and hydrolyzing the product thereby obtained. The improvement is characterized in that the oxidation is carried out under a pressure of 2-15/cm.sup.2 gauge in the presence of an alkali metal compound corresponding to 0.1-1.1 gram atom in terms of alkali metal atom based upon 1 gram atom of the heavy metal used for the catalyst.
The present invention produces a high-quality 5-hydroxyisophthalic acid having excellent color from 5-acyloxy-m-xylene.

REFERENCES:
patent: 4263452 (1981-04-01), Komatsu

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