3764. TYSON, C.W. (Standard Oil Development Co.). Starting-up Operation Using Powdered Catalyst. United States Patent 2,391,366, Dec. 18, 1945; appl. filed June 15, 1943; Serial No. 490,831; 7 claims (Cl. 196-52). Chem. Abs., vol. 40, 1946, p. 1016.

PATENT

3764. TYSON, C.W. (Standard Oil Development Co.). Starting-up Operation Using Powdered Catalyst. United States Patent 2,391,366, Dec. 18, 1945; appl. filed June 15, 1943; Serial No. 490,831; 7 claims (Cl. 196-52). Chem. Abs., vol. 40, 1946, p. 1016.

When powdered catalyst is used, the whole system must be heated to a temperature > the condensation point of H₂O, before the powdered catalyst is introduced, to prevent massing of the catalyst particles. Heated air is passed through both the reaction and regeneration zones until a temperature of 225°-400° F. is reached. An auxiliary burner is then started, and the heated air on the regeneration side is replaced by hot combustion gases diluted with air. The air going to the reaction side is replaced by superheated steam. The combustion gases from the auxiliary burner at a temperature of 1,250° F. are quenched with the cold catalyst, which is then supplied to the regeneration side of the unit. In this way the cold catalyst is heated quickly, and heat is also supplied throughout the equipment.

See abs. 2151, 2493, 3749.