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Patent Abstracts

      768.  ------.  [GARBO, P. W.]  (Hydrocarbon Research, Inc.).  Separating Powdered Catalysts From Exothermically Reactive Gases.  United States Patent 2,526,651, Oct 24, 1950; appl. Filed Aug. 2, 1945, Serial No. 608,394; 11 claims (Cl. 260-449.6).

Control of exothermic reaction of gaseous suspension of unreacted vapors and powdered catalyst is achieved by introducing an agent such as NH3, H2S, or thiophene, which depresses the activity of the catalyst.  In hydrocarbon synthesis NH3 5-15% by volume of CO represses the hydrogenation.  For example, in synthesizing hydrocarbons using Fe catalyst, 2 or 3 fluidizing reactors, preferably decreasing capacity, are arranged serially with means for withdrawal of products between reactors.  At these withdrawal points there is a preceding separation of entrained catalyst in presence of NH3.  1/3-2/3 of the CO will be converted in the 1st reactor, the rest in subsequent steps.  In oxidation of toluene and naphthalebe, lead tetraethyl, Fe pentacarbonyl, and I vapor may be used as repressors: in oxidation of MeOH, Cl- or S-containing compounds: in destructive hydrogenation of mineral oils, steam, or O2.  1 foreign and 13 United States patents cited.