OPTIMISED LIQUID-PHASE OXIDATION Russian patent published in 2010 - IPC C07C51/21 B01J10/00 B01J19/24 

FIELD: chemistry.

SUBSTANCE: liquid-phase oxidation is carried out in a reactor-type bubble column. In one version, the method involves input of an oxidising agent stream containing molecular oxygen into the reaction zone of the reactor-type bubble column. Input of a stream of initial material containing the compound to undergo oxidation in the said reaction zone with provision for input of not more than approximately 80 wt % of the said compound to undergo oxidation of the said stream of initial material into one vertical quadrant of the reaction zone, determined theoretically using a pair of intersecting vertical planes which divide the said reaction zone into four vertical quadrants of equal volume. Oxidation of at least a portion of the said compound to undergo oxidation in liquid phase of a multiphase reaction medium contained in the said reaction zone. In another version there is provision for input of at least approximately 25 wt % of the said compound to undergo oxidation into the said reaction zone in one or several positions inside and at a distance from the said vertical sidewalls of at least 0.05D, where D is maximum diametre of the said reaction zone. If the compound to undergo oxidation is paraxylene and the oxidation reaction product is crude terephthalic acid (CTA), then that product can be purified and extracted using cheaper methods compared to the one that could have been used if CTA had been obtained using a traditional high-temperature oxidation method.

EFFECT: more efficient reaction at relatively low temperatures.

34 cl, 35 dwg, 6 tbl, 13 ex