Method for purifying a naphthalenedicarboxylic acid

Details Method for purifying a naphthalenedicarboxylic acid Method for purifying a naphthalenedicarboxylic acid

1992-06-18

1993-10-26

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562416, 562417, 562488, C07C 51487

Patent

active

052568172

ABSTRACT:
A method for purifying a naphthalenedicarboxylic acid comprising contacting an impure naphthalenedicarboxylic acid with hydrogen in the presence of a hydrogenation catalyst and a solvent comprising a low molecular weight carboxylic acid, at a temperature of at least about 500.degree. F., and a pressure sufficient to maintain the solvent at least partially in the liquid phase and thereafter recovering purified naphthalenedicarboxylic acid.

REFERENCES:
patent: 3584039 (1971-06-01), Meyer
patent: 3888921 (1975-06-01), Yamamoto et al.
patent: 4794195 (1988-12-01), Hayashi et al.
patent: 4933491 (1990-06-01), Albertins et al.
Xu et al., "Chemistry of Synthetic High Polymers," vol. 10, pp. 107-111, (1984).

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