Process for recovery of palladium from spent catalyst
AssigneeCouncil of Scientific and Industrial Research
InventorsRaksh Vir Jasra, Pushpito Kumar Ghosh, Hari Chand Bajaj, Arvindkumar Balvantrai Boricha
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Abstract
The present invention relates to an improved process for the recovery of palladium from spent catalyst. The present invention particularly relates to a suitable method of catalyst recovery of precious metals from spent catalysts or inorganic waste and more specifically the process concerns with the recovery of palladium that is anchored on carbon and is used as catalyst for the hydrogenation of nitro aromatics or as a catalyst for many other organic transformations.
Claims8
A process for recovering palladium from a finely divided spent catalyst generated from a hydrogenation plant, the process comprising
- (i) thermally treating said spent catalyst, wherein the palladium is anchored on carbon;
- (ii) cooling said thermally treated spent catalyst to a temperature from 20 to 40° C. in air;
- (iii) digesting said cooled spent catalyst in a mineral acid in a reaction mixture under continuous stirring, wherein the mineral acid is selected from the group consisting of nitric acid, hydrochloric acid, and sulfuric acid;
- (iv) filtering said reaction mixture to separate carbon particles from filtrate;
- (v) precipitating palladium as a metal salt from the filtrate;
- and
- (vi) drying said metal salt.
Dependencies are inferred from the claim text.