Patent ID: 8329124

Claim:
A solvent extraction composition comprising: a) an orthohydroxyaryloxime extractant chosen from a member selected from the group consisting of: i) an orthohydroxyarylketoxime compound according to Formula (1): and salts, tautomers or metal complexes thereof, wherein R 1 is an optionally substituted C 1 -C 20 hydrocarbyl group; and R 2 is an optionally substituted C 6 -C 20 orthohydroxyaryl group; ii) an orthohydroxyarylaldoxime compound according to Formula (2): and salts, tautomers or metal complexes thereof, wherein R 3 is an optionally substituted C 6 -C 20 orthohydroxyaryl group; and iii) mixtures of (i) and (ii); b) an anti-degradation agent chosen from a member selected from the group consisting of: i) a phenol compound substituted with a member selected from the group consisting of: 2 t-butyl groups; from 1 to 2 t-butyl groups and a C 1 -C 4 alkyl group; from 1 to 3 alkaryl groups; and a cumyl group; ii) a catechol compound substituted with a solubilizing group selected from a member of the group consisting of: an optionally substituted C 6 -C 20 alkyl; and an optionally substituted C 6 -C 20 aryl; iii) a resorcinol compound substituted with a solubilizing group selected from a member of the group consisting of: an optionally substituted C 6 -C 20 alkyl; and an optionally substituted C 6 -C 20 aryl; and iv) mixtures of (i)-(iii); and c) at least one water-immiscible organic solvent.