Solvent extraction process

Details Solvent extraction process Solvent extraction process

1989-02-27

1990-10-09

Sever, Frank

Liquid purification or separation

Processes

Ion exchange or selective sorption

423 22, 423 24, C02F 142, G21F 904

Patent

active

049618563

ABSTRACT:
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 while 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.

REFERENCES:
patent: 4654145 (1987-03-01), Penopoulos et al.

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