2553. OGORZALY, H. J. (Standard Oil Development Co.). Hydrogenation of an Oxide of Carbon. United States Patent 2,458,870, Jan. 11, 1949; appl. filed Maq 29, 1946, Serial No. 673,189; 2 claims (Cl. 260-449.6). Chem. Abs., vol. 43, 1949, p. 3175.

Waxy and oily deposits formed on the catalyst during Fischer-Tropsch synthesis can be removed in a hydrogenation zone by treatment with H2-containing gas at 600-900 F. This treatment will remove deposits not removable by conventional washing with solvents. The advantages of the use of a 2d vessel are: Optimum temperature and pressure can be established; additional H2 and products of hydrogenation are not mixed with the synthesis product; and the CO:H2 ratio in the reaction zone will not be affected by the hydrogenation of the deposits on the catalyst. 3 United States patents are cited.

See also United States Patent 2,414,276 (abs. 3329).

------. See abs. 2169.