Process for producing an aromatic carboxylic acid

Details Process for producing an aromatic carboxylic acid Process for producing an aromatic carboxylic acid

1997-02-10

1998-06-09

Barts, Samuel

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5265

Patent

active

057636486

ABSTRACT:
A process for producing an aromatic carboxylic acid, which comprises oxidizing an alkylaromatic hydrocarbon with a molecular oxygen-containing gas in a liquid phase in an acetic acid solvent in the presence of catalyst components comprising cobalt, manganese and bromine, wherein
(1) the reaction temperature is from 140.degree. to 180.degree. C.,
(2) the cobalt component is in an amount of from 400 to 3,000 ppm by weight to the acetic acid solvent, as calculated as cobalt metal,
(3) the manganese component is in an amount of from 0.001 to 0.4 time in the atomic ratio to cobalt,
(4) the bromine component is in an amount of from 0.1 to 5.0 times in the atomic ratio to cobalt,
(5) a part of an oxidation exhaust gas obtained by removing condensable components by condensation from a gas withdrawn from the reactor, is recycled to a liquid phase in the reactor, and
(6) the reaction pressure is adjusted to a level which is higher than the pressure for a case where air is used as the molecular oxygen-containing gas and no recycling of the oxidation exhaust gas is carried out.

REFERENCES:
patent: 4593122 (1986-06-01), Hashizume et al.
patent: 4827025 (1989-05-01), Shiraki et al.

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