METHOD OF PRODUCING TEREPHTHALIC ACID Russian patent published in 2014 - IPC C07C51/21 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing terephthalic acid from para-xylene, which includes preparing a mixture comprising para-xylene, a solvent, a bromine source, a catalyst and optionally ammonium acetate; and oxidising the para-xylene by bringing the mixture into contact with an oxidising agent in oxidative conditions to obtain a solid oxidation product, where said solid oxidation product comprises terephthalic acid, 4-carboxybenzaldehyde and para-toluic acid; where the solvent comprises a carboxylic acid having 1-7 carbon atoms, dialkylimidazole ionic liquid and optionally water, under the condition that the ratio of the ionic liquid to carboxylic acid in said solvent is in the range of 1:10 to 10:1 by weight; and where the catalyst contains at least one of the following elements: cobalt, titanium, manganese, chromium, copper, nickel, vanadium, iron, molybdenum, tin, cerium and zirconium.

EFFECT: method enables to control content of different impurities in the solid oxidation product.

16 cl, 1 tbl, 9 ex