Method of producing naphthalenedicarboxylic acids and diaryldica

Details Method of producing naphthalenedicarboxylic acids and diaryldica Method of producing naphthalenedicarboxylic acids and diaryldica

1991-06-25

1992-09-01

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562417, 562488, C07C 51265

Patent

active

051440660

ABSTRACT:
A method of producing naphthalenedicarboxylic acids by the oxidation of dialkyl-substituted naphthalene with a gas containing molecular oxygen under liquid phase conditions in an organic solvent and in the presence of a catalyst comprising copper and bromine, or a catalyst comprising copper, bromine and at least one kind of element/compound selected from the group of consisting of amine compounds and heavy metallic elements which are vanadium, manganese, iron, cobalt, nickel, palladium and cerium. And a method of producing diaryldicarboxylic acids by the oxidation of dialkyl-substituted diaryl compounds with a gas containing molecular oxygen in an organic solvent and in the presence of the same catalyst. These methods permit high yields of naphthalenedicarboxylic acids of high purity and of diaryldicarboxylic acids of high purity with the use of small amounts of catalyst.

REFERENCES:
patent: 4750786 (1990-08-01), Sanchez et al.
patent: 4794195 (1988-12-01), Hayashi et al.
patent: 4970338 (1990-11-01), Matsuda et al.
"Effect of Pyridine on Cobalt Bromide Catalyzed Oxidation of P-Xylene in Various Solvents", Oxidation Communications 3, Nos. 3-4, 303-314 (1983).

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