Process for the production of high-purity naphthalenedicarboxyli

Details Process for the production of high-purity naphthalenedicarboxyli Process for the production of high-purity naphthalenedicarboxyli

1997-10-03

1999-01-12

Barts, Samuel

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

Organic compounds

Carboxylic acids and salts thereof

562487, C07C 5142

Patent

active

058592946

ABSTRACT:
A process for producing a high-purity naphthalenedicarboxylic acid having an improved hue or an excellent hue from a crude naphthalenedicarboxylic acid obtained by the oxidation of dialkyl naphthalene, industrially advantageously at high yields, which comprises dissolving a crude naphthalenedicarboxylic acid obtained by the oxidation of dialkyl naphthalene in an aqueous solution containing an aliphatic amine, an alicyclic amine or acetonitrile, removing heavy metal components contained as impurities until the content of the heavy metal components based on the crude naphthalenedicarboxylic acid is 100 ppm or less, and heating the aqueous solution containing a naphthalenedicarboxylic acid amine salt to distill off the amine.

REFERENCES:
patent: 5481033 (1996-01-01), Alms et al.
patent: 5563294 (1996-10-01), Holzhauer et al.
Yamamoto et al., Chemical Abstracts, Vo. 84, No. 17, 26 Apr. 1976 Abstract No. 121553a JP 75 142 542.

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