OPTIMISED LIQUID-PHASE OXIDATION IN REACTOR TYPE BUBBLE COLUMN Russian patent published in 2010 - IPC C07C51/235 B01J19/24 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to oxidation of para-xylene to obtain crude terephthalic acid and a reactor type bubble column. Mainly a gas-phase stream of oxidising agent containing molecular oxygen, and mainly a liquid-phase stream of initial materials containing para-xylene are fed into a reaction zone with maximum diametre D of the reactor type bubble column, and part of the para-xylene is oxidised in liquid phase of the multi-phase reaction medium contained in the reaction zone to obtain crude terephthalic acid. The initial materials are fed into the reaction zone through several inlet openings, at least two of which are spaced out from each other vertically by at least approximately 0.5D. At least part of the reaction zone is defined by one or more vertically lying side walls of the bubble column. At least approximately 25 wt % of para-xylene is fed into the said reaction zone in one or more places lying inside from the vertical side walls at a distance of at least 0.5D. Oxidation is carried out in the volume of the reaction medium with maximum height H, maximum width W and ratio H:W equal to at least approximately 3:1.

EFFECT: more efficient and economical liquid-phase oxidation of an oxidised compound at relatively low temperatures.

31 cl, 35 dwg, 7 tbl, 13 ex