Process for producing terephthalic acid
||US 8884055 B2
||Jun 8, 2011
||Nov 11, 2014
A solid terephthalic acid composition and a process for pro ducing terephthalic acid from para-xylene. The process com prises forming a mixture comprising the para-xylene, a sol vent, a bromine source, and a catalyst; and oxidizing the para-xylene by contacting the mixture With an oxidizing agent at oxidizing conditions to produce a solid oxidation product comprising terephthalic acid, para-toluic acid, 4-car boxybenzaldehyde. The solvent comprises a carboxylic acid having from 1 to 7 carbon atoms and an dialkyl imidazolium ionic liquid; and the catalyst comprises at least one of cobalt, titanium, manganese, chromium, copper, nickel, vanadium, iron, molybdenum, tin, cerium, and zirconium. The solid terephthalic acid composition comprises, less than about 4,000 ppm-wt 4-carboxybenzaldehyde content, and more than about 2,000 ppm-wt a para-toluic acid.