990. HENGSTEBECK, R. J. (Standard Oil Co. of Indiana). Catalytic Conversion. United States Patent 2,493,917, Jan. 10, 1950; appl. filed Nov. 20, 1944, Serial No. 564,348; 13 claims (Cl. 260-449.6). Chem. Abs., vol. 44, 1950, p. 3700.

Patent Abstracts

990. HENGSTEBECK, R. J. (Standard Oil Co. of Indiana). Catalytic Conversion. United States Patent 2,493,917, Jan. 10, 1950; appl. filed Nov. 20, 1944, Serial No. 564,348; 13 claims (Cl. 260-449.6). Chem. Abs., vol. 44, 1950, p. 3700.

Rotating catalyst bed, partly immersed in a cooling liquid, is used. The charge gases are introduced at one side of the bed and withdrawn at the other side. Rotation is at a velocity that will keep the catalyst at uniform temperature. When the heat capacity of the bed is great enough, a relatively nonvaporizable liquid may be used as coolant. When the heat capacity is not great enough to absorb liberated heat of reaction as sensible heat, the catalyst may e kept wet with vaporizable liquid when it is in contact with the reaction gases. The space velocity is controlled by raising and lowering the level of the liquid in which the rotating bed is partly immersed. The speed of rotation is controlled to insure reimmersion of the catalyst before it gets to hot or to insure the presence of vaporizable liquid on the catalyst from the time it emerges from the liquid layer until it is again immersed. Preferred coolants are H₂O gasoline-boiling-range hydrocarbons, and low boiling aqueous mixtures of O-containing products of the Fischer-Tropsch synthesis itself. 1 foreign and 10 United States patents cited.