Process for the purification of terephthalic acid

Details Process for the purification of terephthalic acid Process for the purification of terephthalic acid

1983-01-28

1984-05-08

Trousof, Natalie

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

Organic compounds

Carboxylic acids and salts thereof

562416, 562417, 562485, C07C 5142

Patent

active

044476469

ABSTRACT:
The present invention provides an improved process for the purification of crude terephthalic acid which has been produced by the oxidation of para-xylene. The process comprises contacting the crude terephthalic acid with oxygen-containing gas at a temperature of about 190.degree. to 230.degree. C. and a pressure of about 1,850 to 3,600 kPa in the presence of a solvent comprising an alkanoic acid which is preferably acetic acid. The process further comprises the use of a novel and surprisingly effective catalyst system. The catalyst system comprises cobalt, a bromide compound, and samarium, with the samarium being employed at a concentration of about 0.005 to 500 ppm.

REFERENCES:
patent: 3431296 (1969-03-01), Ichikawa et al.
patent: 3887613 (1975-06-01), Blay
patent: 4201871 (1980-05-01), Tanouchi et al.
patent: 4211882 (1980-07-01), Komatsu et al.
patent: 4314073 (1982-02-01), Crooks

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