PATENT

3317. ----- [SEGURA, M. A.]  (Standard Oil Development Co.).  Catalyst Recovery in Hydrocarbon Synthesis Processes.  United States Patent 2,479,420, Aug. 16, 1949; appl. Sept. 26, 1946, Serial No. 699,561;  10 claims (Cl. 260-449.6).  Chem. Abs., vol. 43, 1949, p. 9420.

If proper particle-size distribution does not exist in a fluidized bed of Fe catalyst, the heat transfer coefficient will be poor, which causes poor fluidization, large losses of catalyst fines, poor heat transfer, and large temperature gradients.  In this invention the catalyst is withdrawn from the reactor, resintered, and returned to the reactor in a particle size greater than the powdered Fe removed from the reactor.  The method is especially recommended for handling powdered catalyst in synthesis of hydrocarbons in a delayed settler, bottom drawoff reactor.  3 United States patents cited.