2824. ROLLMAN, W. F. (Standard Oil Development Co.). Contacting Fluid Solids With Gases. United States Patent 2,491,135, Dec. 13, 1949; appl. filed Apr. 27, 1948, Serial No. 23,590; 4 claims (Cl. 260-449.6). Chem. Abs., vol. 44, 1950, p. 1764.

PATENTS

2824. ROLLMAN, W. F. (Standard Oil Development Co.). Contacting Fluid Solids With Gases. United States Patent 2,491,135, Dec. 13, 1949; appl. filed Apr. 27, 1948, Serial No. 23,590; 4 claims (Cl. 260-449.6). Chem. Abs., vol. 44, 1950, p. 1764.

Subdivided catalyst in a fluid solids hydrocarbon synthesis reactor is withdrawn continuously through a series of vertical tubes near the periphery near the bottom of the reactor. The tubes connect with a corresponding number of inclined tubes manifolded together at the center of the bottom of the reactor through which the synthesis gases enter the reactor. The catalyst. thus withdrawn, is picked up by incoming gases and returned to the reactor. The incoming mixture passes into the reactor through a cone. The turbulent fluid bed condition is arrived at a lower vapor inlet velocity than when catalyst is not recycled without any tendency to fixed bed formation at the extreme bottom of the vessel. Overheating is prevented and attrition is reduced. 3 United States patents cited.