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.