2815. ROELEN, O., AND HANISCH, F. (Hydrocarbon Synthesis Corp.).Cobalt Recovery From Spent Catalysts. United States Patent 2,215,885, Sept. 24, 1940; appl. filed Sept. 17, 1938, Serial No. 230,510; in Germany Sept. 25, 1937; 3 claims (Cl. 23-238) Chem

PATENTS

2815. ROELEN, O., AND HANISCH, F. (Hydrocarbon Synthesis Corp.).Cobalt Recovery From Spent Catalysts. United States Patent 2,215,885, Sept. 24, 1940; appl. filed Sept. 17, 1938, Serial No. 230,510; in Germany Sept. 25, 1937; 3 claims (Cl. 23-238) Chem. Abs., vol. 35, 1941, p. 861.

Method of recovering Co values from catalysts prepared by precipitating compounds of Co onto kieselguhr. that have been used in the synthetic production of benzine from CO and H₂ by which a paraffinic deposit has been formed on the catalysts, involves treating the catalyst with a solution containing HNO₃until the Co is dissolved, the solution containing, throughout the process, a concentration of about 3-5% HNO₃and separating the resulting solution from the kieselguhr.