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Return to Abstracts of Patents Return to Abstracts of Patents 500-749 Patent Abstracts749. ------. [FRIEDMAN, A. H.] (Phillips Petroleum Co.). Method for Replacing Deactivated Hydrocarbon Synthesis Catalyst With Fresh Catalyst. United States Patent 2,573,559, Oct. 30, 1951: appl. filed June 21, 1948, Serial No. 34,177: 6 claims (Cl. 260-449.6). A deactivated fluidized catalyst of the type utilized in the catalytic synthesis of hydrocarbons and of oxygenated compounds and having an average particle size of 40- to 400-mesh is reactivated by introducing a fresh fluidizable catalyst, differing by at least 10-mesh size from the average particle size of the catalyst present, into the reaction zone in suitably measured amounts, so that the catalytic operation is not interfered with, and withdrawing a like portion of deactivated catalyst from the reaction zone at a point below the upper level of the fluidized catalyst by difference in particle size into fresh and deactivated portions and returning the fresh catalyst to the reaction zone. These steps are continued until the fluidized bed of deactivated catalyst has been substantially replaced by fresh catalyst. The exchange may take 20-48 hr. |