Process for producing highly pure terephthalic acid

Details Process for producing highly pure terephthalic acid Process for producing highly pure terephthalic acid

1993-10-13

1995-05-30

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562412, 562417, C07C 5142

Patent

active

054203449

ABSTRACT:
A process for producing highly pure terephthalic acid, which comprises heating and dissolving crude terephthalic acid in water, and purifying it by contacting the aqueous solution with hydrogen at a temperature of from 260.degree. to 320.degree. C. in the presence of a platinum group metal catalyst, wherein the purification is initiated within three minutes after the aqueous solution under heating reaches a temperature of 250.degree. C.

REFERENCES:
patent: 3584039 (1971-06-01), Meyer
patent: 3639465 (1972-02-01), Olsen et al.
patent: 4877900 (1989-10-01), Tamaru et al.
patent: 4892972 (1990-01-01), Schroeder et al.

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