CPC C22B 11/04 (2013.01) [C22B 3/10 (2013.01); C22B 3/12 (2013.01); C22B 3/14 (2013.01); C22B 3/165 (2013.01); C22B 3/22 (2013.01); C22B 3/42 (2013.01); C22B 3/44 (2013.01); C22B 11/06 (2013.01); Y02P 10/20 (2015.11)] | 16 Claims |
1. A method comprising:
evaporating a liquid stream comprising an alkali metal chloride and a substituted quaternary amine to form a crystal slurry in at least one evaporator maintained at a boiling temperature between 100° C. and 150° C.;
contacting the crystal slurry with a stream comprising at least one of palladium, rhodium, and platinum and comprising negligible amounts of copper, iron, nickel, lead, cobalt, aluminum, calcium, bismuth zinc, sulfur, selenium, tellurium, arsenic, ruthenium, silver and gold.
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