Patent ID: 8470052

Claim:
A method for extracting a metal from an aqueous solution, the method comprising: contacting an aqueous solution containing a dissolved metal with a solvent extraction composition comprising: a water-immiscible organic solvent; and a metal extractant 2-hydroxyphenyldiazole compound according to Formula (1): and tautomers and salts thereof, wherein R 5 is chosen from a member selected the group consisting of hydrogen, an optionally substituted C 1 -C 36 hydrocarbyl group, halogen, and nitro; R 7 is selected from the group consisting of hydrogen, and an optionally substituted C 1 -C 36 hydrocarbyl group; each of R 9 and R 10 is independently chosen from a member selected from the group consisting of: hydrogen, an optionally substituted C 1 -C 36 hydrocarbyl group, an optionally substituted hydrocarbyloxy group, an optionally substituted hydrocarbyloxycarbonyl group, and an optionally substituted hydrocarbylcarbonyloxy group, and an optionally substituted mono or dihydrocarbylaminocarbonyl group; whereby at least a fraction of the metal is complexed with the metal extractant compound and extracted into the organic solvent.