Process for preparing terephthalic acid

Details Process for preparing terephthalic acid Process for preparing terephthalic acid

C - Chemistry, Metallurgy

07

C

260/510.5

C07C 63/26 (2006.01) C07C 51/265 (2006.01)

Patent

CA 1145357

ABSTRACT OF THE DISCLOSURE A process for preparing terephthalic acid is dis- closed 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) Image (1) wherein y represents the molar ratio of water/p-toluic acid in the reaction mixture, x represents the molar ratio of manganese/total amount of manganese + cobalt in the catalyst composition Image A equals about 0.200, B equals about 10.9, C equals about 4.35; and D equals about 0.0724.

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