Process for preparing terephthalic acid

Details Process for preparing terephthalic acid Process for preparing terephthalic acid

1979-08-22

1981-03-24

Siegel, Alan

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

Organic compounds

Carboxylic acids and salts thereof

C07C 51255

Patent

active

042582091

ABSTRACT:
A process for preparing terephthalic acid is disclosed which comprises the steps of oxidizing a substantially homogenous liquid reaction mixture, comprising p-toluic acid, optionally in admixture with p-xylene and partially oxidized p-cylene derivatives, an amount of between 5% and 80% by weight of water, and an oxidation catalyst comprising a catalytically-active metal compound such as manganese compounds, cobalt compounds or mixtures thereof, with an oxygen-containing gas. At least a minimum amount of M millimoles of the catalytically-active metal compound per kg of the liquid reaction mixture is used, wherein M is defined by the following equation (1) ##EQU1## wherein y represents the molar ratio of water/p-toluic acid in the reaction mixture,

REFERENCES:
patent: 2833819 (1958-05-01), Egbert et al.
patent: 3700731 (1972-10-01), Sullivan
patent: 3852343 (1974-12-01), Hanotier et al.

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