Process for purification of naphthalenedicarboxylic acid

Details Process for purification of naphthalenedicarboxylic acid Process for purification of naphthalenedicarboxylic acid

1992-11-30

1994-09-06

Dees, Jose

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

Organic compounds

Carboxylic acids and salts thereof

562412, C07C 5143

Patent

active

053449690

ABSTRACT:
A process for purifying a crude naphthalenedicarboxylic acid containing impurities and coloring substances obtained by the oxidation of a di-substituted naphthalene, dispense with the use of a large amount of alkali or acid, and producing a naphthalenedicarboxylic acid having a high purity and good color effectively and in a high recovery is disclosed, which comprises dissolving the crude naphthalenedicarboxylic acid in a mixed solvent comprising an amine compound and an alcohol and conducting crystallization.

REFERENCES:
patent: 2849483 (1958-08-01), Ham
patent: 2949483 (1960-08-01), Ham

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