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Patent Abstracts

      383.     ------.  [CLARK, A.]  (Phillips Petroleum Co.).  Regeneration of Catalysts Used in the Production of Hydrocarbons From Carbon Monoxide and Hydrogen.  United States Patent 2,479,999, Aug. 23, 1949: appl. filed May 28, 1945.  Serial No. 596,407: 7 claims (Cl. 260-449.6).  Chem. Abs., vol. 43, 1949, p. 9420.

 Fischer-Tropsch reaction is carried out under known conditions until the activity of the catalyst declines owing to waxy deposit.  Then the temperature of the catalyst bed is raised by cutting down the flow of cooling fluid or by introducing heating fluid into the heat exchanger until CH₄ and steam are the predominant reaction products formed.  The actual minimum temperature to accomplish this result will depend on the catalyst used.  For a CO: Th: kieselguhr catalyst 100:18:100, this temperature is approximately 270º C.  For an ordinary Fe catalyst it will be 300º C. or higher, whereas for a sintered Fe catalyst it will be 340º C.  In an example using a Co: Th: kieselguhr catalyst 100:18:100, the temperature was allowed to rise to 308º C. and maintained until analysis of the effluent showed essentially CH₄ and C₂H₆.  The treatment was continued for 5 hr. The effluent was O₂, 5.1%; CO₂, 13%; olefins , 0.4%; H₂, 9.4%; CO, 1.1%: CH₄. 62% and C₂H₆, 6.9%.  At this point the catalyst was free from waxy deposit.  The temperature was dropped to 246º C., and the synthesis continued.  The reaction products with both fresh and reactivated catalyst in ml. Per m.3 of synthesis gas was as follows:

Solid and liquid hydrocarbon---------------------90

Oil b. above 200º C---------------------------------20

Gasoline b. below 200º C--------------------------41

Gaseous hydrocarbons (including O₂ and C₄)---5

Paraffin wax------------------------------------------25

2 literature refs. And 5 United States patents cited.