Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1991-10-15
1993-02-02
Dees, Jose G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
502 28, 556 49, 556147, 562416, 562417, 562487, 562488, C07C 51265
Patent
active
051839334
ABSTRACT:
Provided is a continuous process for producing 2,6-naphthalenedicarboxylic acid by the liquid phase oxidation of 2,6-dimethylnaphthalene comprising continuously adding to a reaction zone the oxidation reaction components comprising 2,6-dimethylnaphthalene, a source of molecular oxygen, a solvent comprising an aliphatic monocarboxylic acid, and a catalyst comprising cobalt, manganese and bromine components, wherein the atom ratio of manganese to cobalt is about 5:1 to about 0.3:1, the total of cobalt and manganese is at least about 0.40 weight percent based on the weight of solvent, and maintaining the contents of the reaction zone at a temperature of about 370.degree. F. to about 420.degree. F. and at a pressure sufficient to maintain at least a portion of the monocarboxylic acid in the liquid phase thereby oxidizing the 2,6-dimethylnaphthalene to 2,6-naphthalenedicarboxylic acid. By operating according to the process of this invention, 2,6-naphthalenedicarboxylic acid can be continuously produced in high yield and with low levels of impurities.
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Harper Jon J.
Kuhlmann George E.
Larson Keith D.
McMahon Rosemary F.
Sanchez Paul A.
Amoco Corporation
Clarke Vera C.
Dees Jos,e G.
Nemo Thomas E.
Oliver Wallace L.
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