Process for preparing polymer grade terephthalic acid

Details Process for preparing polymer grade terephthalic acid Process for preparing polymer grade terephthalic acid

1990-10-12

1993-05-11

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562480, 562485, C07C 51487

Patent

active

052102920

ABSTRACT:
A process for purifying a crude terephthalic acid obtained by neutralization of the disodium terephthalate from alkali waste water from a polyester fabric-treatment process, into polymer grade terephthalic acid. The crude terephthalic acid is crushed, and fed to the kiln at 150.degree.-300.degree. C. for thermal treatment in an aqueous solution. The ammoniated, and the impurities in the solution are removed by adsorption followed by deammoniation, which may be accomplished by heating or by treatment with sulfuric acid.

REFERENCES:
patent: 4716245 (1987-12-01), Hirose
patent: 4820868 (1989-04-01), Mitamura et al.

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