1811.  KEITH, P. C. (Hydrocarbon Research, Inc.). Catalytic Synthesis of Hydrocarbons. United States Patent 2,506,221, May 2, 1950; appl. filed Feb. 18, 1947, Serial No. 729,217; 6 claims (Cl. 260-449.6). Chem. Abs., vol. 44, 1950, p. 6106.

Synthesis gas is introduced into the lower portion of the reactor and passes upward through a series of successive, independently supported catalyst masses. The effluent from each preceding catalyst mass is mixed with additional synthesis gas in an orifice or constricted passage before uniform redistribution through the next succeeding bed of catalyst. Each zone is separated from the preceding zone not only by a restricted passage, but also by suitable means such as a conical bottom wall concave on its upper surface adapted to distribute the upward flow of gas uniformly throughout the horizontal cross section of the catalyst mass, which it supports. Each zone is provided with individual cooling surfaces immersed in the fluidized powder and provided with an internal coolant. The cooling surface may take any conventional form. 9 United States patents cited.