Process for purification of aromatic dicarboxylic acids

Details Process for purification of aromatic dicarboxylic acids Process for purification of aromatic dicarboxylic acids

1990-06-27

1992-03-17

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562485, 562486, C07C 5147

Patent

active

050970666

ABSTRACT:
Aromatic dicarboxylic acids, specifically 4,4'-dicarboxydiphenyl ether, terephthalic acid, 4,4'-carboxybis(benzoic acid) and the like, are purified by dissolving the crude acid in a monocarboxylic acid anhydride, purifying the resulting solution, and recovering a purified acid product therefrom.

REFERENCES:
patent: 3574727 (1971-04-01), Taylor et al.
patent: 3592847 (1971-07-01), Gailivan et al.
patent: 4370496 (1983-01-01), Shigeyasu et al.

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