Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1998-03-26
2000-01-25
Killos, Paul J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562412, C07C 5116
Patent
active
060180773
ABSTRACT:
A process for producing 2,6-naphthalenedicarboxylic acid comprising oxidizing 2,6-dimethylnaphthalene with a gas containing oxygen in a solvent comprising a lower aliphatic carboxylic acid in the presence of a catalyst comprising cobalt, manganese, and bromine, wherein the total amount of cobalt and manganese in the catalyst is 50 to 300 mg atom per 1 g mol of 2,6-dimethylnaphthalene, a ratio by g atom of manganese to cobalt in the catalyst is 20:1 to 4:1, and the oxidation is conducted at a temperature of 200 to 250.degree. C.; and a process as described above, wherein a mother liquor which is obtained from a slurry of a product of the oxidation via a step of solid-liquid separation is recyled to a step of oxidation after heat treatment at a temperature of 150.degree. C. or higher. In accordance with the processes, accumulation of substances which affect the oxidation adversely is prevented. Moreover, a large fraction of a mother liquor of oxidation can be recycled without decrease in the yield of the reaction, and the catalyst components and the solvent components in the mother liquor of oxidation can be utilized efficiently.
REFERENCES:
patent: 3856855 (1974-12-01), Yamashita et al.
patent: 4933491 (1990-06-01), Albertins et al.
patent: 5183933 (1993-02-01), Harper et al.
patent: 5292934 (1994-03-01), Sikkenga et al.
Database WPI, Section Ch, Week 9502, Derwent Publications Ltd., London, GB, Class A41, AN 95-009584 of JP 06 293 697 A, Oct. 1994.
Inari Masato
Machida Hiroshi
Ogawa Hiroshi
Ohkoshi Fumio
Tanaka Kazuo
Killos Paul J.
Mitsubishi Gas Chemical Company Inc.
Parsa J.
LandOfFree
Process for producing 2,6-naphthalenedicarboxylic acid does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for producing 2,6-naphthalenedicarboxylic acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing 2,6-naphthalenedicarboxylic acid will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2316965