OPTIMISED LIQUID-PHASE OXIDATION Russian patent published in 2010 - IPC C07B33/00 C07C51/235 B01J19/24 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to liquid-phase catalytic oxidation of an aromatic compound and a reactor-type bubble column. A stream of starting material containing an oxidisable compound and an stream of oxidising agent containing molecular oxygen are fed into the reaction zone of a reactor-type bubble column with maximum height H and maximum width W. At least a portion of the said oxidisable compound is oxidised in liquid-phase by a multiple-phase reaction medium in the reaction zone when at least part of the reaction medium comes into contact with at least one deflector placed in the reaction zone. At least approximately 10 wt % of the oxidisable compound is converted to solid substance in the reaction medium. The ratio H:W of the column is at least approximately equal to 6:1. At least approximately 30 wt % of the oxidisable compound is fed into the reaction zone at a distance of approximately 1.5 H from the lowest mark for inlet of molecular oxygen into the reaction zone. When the oxidisable compound is paraxylene and the oxidation reaction product is crude terephthalic acid, the said product can be purified and extracted using methods which are cheaper than methods which would be used if the product were to be obtained via high-temperature oxidation.

EFFECT: more efficient and cheaper oxidation of the oxidisable compound at relatively low temperature.

38 cl, 58 dwg, 4 tbl, 10 ex