Process for producing trimellitic acid

Details Process for producing trimellitic acid Process for producing trimellitic acid

1987-09-04

1989-05-30

Shippen, Michael L.

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

Organic compounds

Carboxylic acids and salts thereof

562416, C07C 51265

Patent

active

048353086

ABSTRACT:
A process for producing trimellitic acid by oxidizing pseudocumene with a molecular oxygen-containing gas in an acetic acid solvent in the presence of a catalyst comprising one or more cobalt compounds, one or more manganese compounds, and one or more bromine compounds, wherein the total amount of the cobalt compound is in the range of 0.01-1.0% by weight of the acetic acid solvent based on the weight of cobalt metal, the total amount of the manganese compound is in the range of 0.01-0.1% by weight of the acetic acid solvent based on the weight of manganese metal, the total amount of the bromine compound is in the range of 0.01-2.0% by weight of the acetic acid solvent based on the weight of bromine atoms, with the proviso that the atomic ratio of bromine to cobalt and manganese [Br/(Co+Mn)] is in the range of 2.51-2.99, which process comprises at least two reaction-stages comprising the preceding reaction-stage in which the reaction temperature is maintained in the range of 110.degree. to 180.degree. C. and the succeeding reaction-stage in which the reaction temperature is maintained in the range of 180.degree.-230.degree. C., the whole amounts of the cobalt compound, the manganese compound, the bromine compound, the acetic acid solvent and the reactant being introduced into the first stage of the preceding reaction-stage and the oxidation reaction being virtually completed in the succeeding reaction-stage.

REFERENCES:
patent: 3683016 (1972-08-01), Darin
patent: 4398040 (1983-08-01), Suzuki

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