1772. ------. [JOHNSON, E. A.] (Standard Oil Co. of Indiana). Hydrocarbons From Carbon Monoxide and Regeneration of Synthesis Catalyst. United States Patent 2,455,419, Dec. 7, 1948. Chem. Abs., vol. 43, 1949, p. 1551.

In the hydrogenation of CO with a fluidized Fe catalyst, the catalyst gradually loses activity owing to accumulation of S compounds. A portion of the catalyst is withdrawn from the hydrogenation zone and passed to a desulfurizing zone in which it flows downward in a fluidized state against a countercurrent stream of air or other oxidizing gas at 1,000º-2,000º F., preferably about 1,500º F. The S is removed as SO₂ and the oxidized catalyst is passed to a reducing zone in which it flows downward in a fluidized state against a countercurrent stream of H₂ or H₂-containing gas and is thus reactivated. The catalyst is cooled and recycled to the synthesis zone or recycled in whole or in part to the oxidizing zone. Gives a flowsheet and construction details of the desulfurizing system.