Processes for the production of high-purity dimethyl 2, 6-naphth

Details Processes for the production of high-purity dimethyl 2, 6-naphth Processes for the production of high-purity dimethyl 2, 6-naphth

1998-04-30

2000-01-11

Barts, Samuel

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

Organic compounds

Carboxylic acid esters

C07C 6748

Patent

active

060138319

ABSTRACT:
A process for the production of high-purity dimethyl 2,6-naphthalenedicarboxylate, which comprises esterifying 2,6-naphthalenedicarboxylic acid obtained by liquid phase oxidation of 2,6-dialkylnaphthalene with molecular oxygen in the presence of an oxidation catalyst, with methanol and then purifying a crude ester formed by the esterification, the crude ester being purified in the presence of an aromatic hydrocarbon as a solvent, in which impurities contained in a reaction product obtained by the esterification of 2,6-naphthalenedicarboxylic acid prepared by the liquid phase oxidation of 2,6-dialkylnaphthalene are effectively removed with simple procedures, oxidation catalyst metals are recovered, a crystal of naphthalenedicarboxylic acid formed by the oxidation of dialkylnaphthalene and/or its oxide derivative can be easily separated, and the oxidation catalyst to be brought into the step of producing dimethyl naphthalenedicarboxylate is recovered in the process of the production of naphthalenedicarboxylic acid and effectively used in the process of the production of naphthalenedicarboxylic acid.

REFERENCES:
patent: 4886901 (1989-12-01), Holzhauer et al.
patent: 5183933 (1993-02-01), Harper et al.
patent: 5262560 (1993-11-01), Holzhauer et al.
Patent Abstracts of Japan, 17(232) (C-1056), abstract of JP 4-364152 (May 1993).

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