3749. THOMPSON, W. I., AND TYSON, C. W. (Standard Oil Development Co.). Regeneration of Fluidized Catalysts. United States Patent 2,475,650, July 12, 1949. Chem. Abs., vol. 43, 1949, p. 9300.

PATENT

3749. THOMPSON, W. I., AND TYSON, C. W. (Standard Oil Development Co.). Regeneration of Fluidized Catalysts. United States Patent 2,475,650, July 12, 1949. chem. Abs., vol. 43, 1949, p. 9300.

Combustible contaminants are removed from finely divided catalysts by burning with O₂-containing regenerating gas. The regeneration is carried out in successive heated zones, with progressively increasing O₂ concentration and total pressures in the individual stages. This technique tends to counteract the decreased reaction rate resulting from loss of combustible matter. Effluent regenerating gas from a particular regenerating zone is used as feed gas for the preceding zone. The contact material and gas are blown upward in each stage, so that the time of passage of the regenerating gas is materially less than that of the fluidized catalyst. Gives 1 diagram.