Solvent extraction process

Details Solvent extraction process Solvent extraction process

C - Chemistry, Metallurgy

22

B

53/168

C22B 3/36 (2006.01) C01G 55/00 (2006.01)

Patent

CA 1337738

An aqueous solution containing palladium is contacted with a solution of a heterocyclic ring compound having at least one ring substituent of the type -COX, which is, or contains, a hydrocarbyl group having at least 5 carbon atoms. The heterocyclic ring compound may be a pyridine mono-, di- or tri-carboxylic acid ester, for example the bis-isodecyl ester of pyridine- 3,5-dicarboxylic acid. Other heterocyclic ring compounds include those having a pyrimidine, pyrazine, pyridazine, 1,2,4-triazole or imidazole ring. Palladium is extracted into the water-immiscible solution whilst other metals, particularly platinum group metals, remain in the aqueous solution. The palladium can be stripped from the water-immiscible solution for example using a dilute aqueous solution of ammonia.

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