Process for the purification of naphthalenedicarboxylic acid

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

1998-06-19

1998-11-24

Barts, Samuel

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5123

Patent

active

058409700

ABSTRACT:
Disclosed is a process for the purification of a naphthalenedicarboxylic acid (NDA) which has been manufactured by the oxidation of a dialkylnaphthalene in the presence of a molecular oxygen-containing gas and a heavy metal-containing catalyst and contains metal residues, e.g., cobalt and manganese residues, as impurities. The process involves contacting an acetic acid slurry of a NDA, typically 2,6-naphthalenedicarboxylic acid, containing such metals, with acetic anhydride.

REFERENCES:
patent: 3888921 (1975-06-01), Yamamoto et al.
patent: 4933491 (1990-06-01), Albertins et al.
patent: 5183933 (1993-02-01), Harper et al.
patent: 5254719 (1993-10-01), Holzhauer et al.
patent: 5292934 (1994-03-01), Sikkenga et al.

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