Ray Charles Lindemann

US Patent:

50062620, Apr 9, 1991

Filed:

Nov 21, 1989

Appl. No.:

7/440126

Inventors:

John Weyls - Cleveland OH
Ray C. Lindemann - Montgomery AL

Assignee:

Met. Rev. Inc. - Cleveland OH

International Classification:

C02F 170

US Classification:

210719

Abstract:

A process for recovering copper from cupric ion containing aqueous solutions which comprises adding to the aqueous solution containing cupric ions an amount of reducing agent which corresponds from 0. 1 to 10 moles of reducing agent per mole cupric ion, and heating the reaction mixture in the absence of oxygen in a closed vessel to a temperature of from 170. degree. to 240. degree. C. , said reducing agent being one or more members of the group consisting of: (a) organic aldehydes RCHO (R=H, C. sub. 1 to C. sub. 5 alkyl) (b) carboxylic acids R COOH (R=H, linear or branched C. sub. 1 to C. sub. 5 alkyl) (c) hydroxycarboxylic acids R. sub. 1 COOH (R. sub. 1 =HO(CH. sub. 2). sub. n, CH. sub. 3 CH(OH)--, CH. sub. 3 (CH. sub. 2). sub. n, CH(OH)-- with n=1 to 3) (d) dicarboxylic acids R. sub. 2 COOH (R. sub.