Process for preparing purified 2,6-naphthalenedicarboxylic acid

Details Process for preparing purified 2,6-naphthalenedicarboxylic acid Process for preparing purified 2,6-naphthalenedicarboxylic acid

1995-06-06

1997-05-13

Geist, Gary L.

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

Organic compounds

Carboxylic acids and salts thereof

562486, 562488, 562412, 562414, 528298, C07C 5109, C07C 5121, C08G 6318

Patent

active

056294468

ABSTRACT:
A process for preparing purified 2,6-naphthalenedicarboxylic acid which comprises hydrolyzing a dialkyl-2,6-naphthalenedicarboxylate with water at a reaction temperature of at least about 450.degree. F. under liquid phase condition, the amount of water present being sufficient to solubilize, at the reaction temperature, at least about 10 percent of the 2,6-naphthalenedicarboxylic acid formed; and a process for purifying 2,6-naphthalenedicarboxylic acid comprising combining impure 2,6-naphthalenedicarboxylic acid with a purification solvent, heating the resulting mixture under liquid phase conditions at a temperature of at least about 500.degree. F. to form a product mixture and thereafter recovering from the product mixture purified 2,6-naphthalenedicarboxylic acid.

REFERENCES:
patent: 3671578 (1972-06-01), Ogata et al.
patent: 4933491 (1990-06-01), Albertins et al.
patent: 5068410 (1991-11-01), Tanaka et al.
patent: 5149867 (1992-09-01), Chen et al.
patent: 5256817 (1993-10-01), Sikkenga et al.
patent: 5292934 (1994-03-01), Sikkenga et al.

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