Fischer-tropsch process
AssigneeMobil Oil Corporation
InventorsWerner O. Haag, James C. Kuo, Paul B. Weisz
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Abstract
An improved Fischer-Tropsch process for hydrocarbon synthesis operated in the fluid mode of the Sasol's Synthol Process provides increased diesel and heavier hydrocarbon yield wherein a Fischer-Tropsch synthesis catalyst modified by a minor amount of a zeolite catalyst selectively converts enough waxy product to prevent adhesion between catalyst particles which might interfere with catalyst flow thereby permitting maximization of diesel oil and heavy hydrocarbon yield.
Claims34
A method for maximizing the production of diesel oil and heavier hydrocarbon oils comprising contacting a suitable synthesis gas feed comprising hydrogen and carbon oxides with a fluidized or moving bed catalyst system comprising a major proportion of a Fischer-Tropsch synthesis catalyst containing a minor proportion of a zeolite catalyst having an alpha value of from 1 to about 200 and wherein the fraction of zeolite catalyst used, zeolite activity and the amount of liquid product produced are controlled in accordance with the following equation:
- f.alpha.W+A.n
- where f is the fraction of zeolite catalyst used, alpha is zeolite activity, W is the weigh of liquid product per weight of total solid catalyst charge per hour, A is an average number which varies inversely with the operating temperature and n is from about 1 to 10, thereby selectively converting or cracking sufficient waxy product also produced to prevent adhesion between catalyst particles, maintaining catalyst fluidity and maximizing diesel oil and heavier hydrocarbon yield.
In a Fischer-Tropsch process for maximizing the production of diesel oil and heavier hydrocarbon oil, the improvement comprising contacting a synthesis gas feed comprising hydrogen and carbon monoxide with a fluidized or moving bed catalyst system comprising a major amount of a Fischer-Tropsch synthesis catalyst and a minor amount of a zeolite catalyst having an alpha value of from about 1 to 200 wherein the fraction of zeolite catalyst used, zeolite activity and the amount of liquid product produced are controlled in accordance with the following equation:
- f.alpha.W=A.n
- where f is the fraction of zeolite catalyst used, alpha is zeolite activity, W is the weight of liquid product per weight of total solid catalyst charge per hour, A is an average number which varies inversely with the operating temperature and n is from about 1 to 10, thereby selectively converting or cracking sufficient waxy product also produced to prevent adhesion between catalyst particles, maintaining catalyst fluidity and maximizing diesel oil and heavier hydrocarbon yield.
Dependencies are inferred from the claim text.