Shell Oil Comapny

Abraham J Van Der Zeeuw

Riekert Kok

Peter Koenders

A process is described for the selective recovery of nickel values from an aqueous solution containing nickel values by means of liquid/liquid extraction, wherein the aqueous solution is contacted with an organic extractant comprising a substantially water-immisicible organic solvent and one or more of certain alpha,beta-dioxime compounds. Novel alpha, beta-dioxime compounds for use in the extraction process are also described.

Liquid/liquid extraction of nickel values

A process is described for the recovery of copper values from an acidic aqueous solution containing copper values by means of liquid-liquid extraction, wherein the extractant is a mixture comprising a substantially water-immiscible organic solvent, one or more hydroxyoximes capable of extracting copper values, and one or more alpha, betadioximes of the anti-configuration. Novel alpha, beta-dioxime compounds are also disclosed.

Extraction of copper values from aqueous solution

Novel 2-hydroxyiminoacetic acids of the formula ##STR1## where R is an aromatic hydrocarbyl group substituted with one or more aliphatic chains of at least four carbon atoms are excellent for the extraction of metal values from acidic metal - containing aqueous solutions, particularly for the separation of Cu from Fe, Ni from Co and Ca from Mg.

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Amsterdam, Netherlands

Abraham J Van Der Zeeuw