METHOD OF EXTRACTING CATALYST Russian patent published in 2013 - IPC B01J38/74 B01J23/30 B01J38/68 

FIELD: chemistry.

SUBSTANCE: invention relates to extraction of heteropoly acids from catalysts. Described is a method of extracting heteropolytungstic acid from a spent catalyst which contains heteropolytungstic acid deposited on a support, involving (a) bringing the spent catalyst into contact with an extractant selected from water, methanol, ethanol and a mixture of any two or more thereof, for a period of time sufficient for extraction of at least a portion of heteropolytungstic acid; (b) separating the extractant, which contains heteropolytungstic acid, from the treated spent catalyst; (c) bringing the extractant, which contains heteropolytungstic acid, into contact with a strongly acidic ion-exchange resin to remove corroded metals contained therein and (d) separating the treated extractant which contains heteropolytungstic acid.

EFFECT: high efficiency of the method.

11 cl, 1 tbl, 21 ex