OPTIMISED LIQUID-PHASE OXIDATION Russian patent published in 2011 - IPC C07C51/265 C07C51/42 C07C63/26 C07C51/16 

FIELD: chemistry.

SUBSTANCE: invention relates to an improved continuous method of producing terephthalic acid, involving (a) feeding para-xylene into an oxidation reactor; (b) oxidation of at least a portion of said para-xylene in the liquid phase of a multi-phase reaction medium contained in said oxidation reactor until crude terephthalic acid is obtained, where said oxidation results in production of carbon dioxide, carbon monoxide and/or methyl acetate; and maintaining, during said oxidation, the molar ratio of obtained carbon oxides to said para-xylene in the range from 0.02:1 to 0.24:1. The invention also relates to a continuous method of producing terephthalic acid, involving (a) feeding para-xylene into an oxidation reactor; (b) oxidation of at least a portion of said para-xylene in the liquid phase of a multi-phase reaction medium, contained in said oxidation reactor, until crude terephthalic acid is obtained; and (c) maintaining, during said oxidation, molar ratio of persistence of said para-xylene in the range from 99.0 to 99.7%.

EFFECT: more efficient and cheaper liquid-phase oxidation of an oxidisable compound.

33 cl, 35 dwg, 7 tbl, 4 ex