Process for purification of aromatic polycarboxylic acids

Details Process for purification of aromatic polycarboxylic acids Process for purification of aromatic polycarboxylic acids

1996-09-17

2000-10-17

Gerstl, Robert

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5143

Patent

active

061334766

ABSTRACT:
The present invention provides a process for purifying crude aromatic polycarboxylic acids having one or more condensed rings, wherein two or more carboxylic acid groups can be at any position of the aromatic ring or rings. The process uses solvents consisting of two families of organic compounds as major solvent: a monocyclic compound containing two hetero-atoms and alkylamine compound, and two families of co-solvent: water and alcohol, to separate impurities from the crude acids. The product purity from the instant invention can be achieved to a level that is significantly better than the current state of the art.

REFERENCES:
patent: 2811548 (1957-10-01), Ham
patent: 2829160 (1958-04-01), Stehman
patent: 2862963 (1958-12-01), Hofheim
patent: 4201871 (1980-05-01), Tenouchi
patent: 5183933 (1993-02-01), Harper
patent: 5344969 (1994-09-01), Iwane
patent: 5565609 (1996-10-01), Hirowatari

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