2831. ROTTIG, W. (Ruhrchemie A. G.). Catalytic Hydrogenation of Carbon Monoxide With Iron Catalysts. United States Patent 2,620,347, Dec. 2, 1952; appl. filed Apr. 26, 1950, Serial No. 158,320; in Germany, May 7, 1949; 12 claims (Cl. 260-449.6)

PATENTS

2831. ROTTIG, W. (Ruhrchemie A. G.). Catalytic Hydrogenation of Carbon Monoxide With Iron Catalysts. United States Patent 2,620,347, Dec. 2, 1952; appl. filed Apr. 26, 1950, Serial No. 158,320; in Germany, May 7, 1949; 12 claims (Cl. 260-449.6). Chem. Abs., vol. 47, 1953, p. 5666.

Synthesis gas is passed over Fe catalyst that has been activated by continuous contact with synthesis gas for at least 96 hr. The temperature is maintained at 150°-195° C., and the paraffin is extracted from the catalyst with a solvent at that temperature. The treatment is repeated at least once more with synthesis gas for 100-200 hr. at atmospheric pressure. The temperature throughout the major part of the catalytic material is kept at 190°-200° C. The catalyst thus prepared by repeated solvent extraction may be used for a considerable period of time before any appreciable drop in efficiency. H₂ reduction of the Fe particles is carried out preferably at 200°-250° C. and a gas velocity of 100-200 cm. per sec. until at least 25% by weight of the total Fe is obtained in the reduced form. 3 United States patents cited.