Conversion of synthesis gas to hydrocarbon mixtures utilizing dual reactors
AssigneeMobil Oil Corporation
InventorsWerner O. Haag, Tracy J. Huang
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Abstract
The conversion of less than 1 H.sub.2 /CO ratio syngas to high yield of C.sub.3 plus product is accomplished with a CO reducing catalyst comprising shift characteristics and the product of Fischer-Tropsch synthesis is converted to premium gasoline and distillate fuels by contact with acidic ZSM-5 zeolite. The syngas conversion may be accomplished in any catalyst system permitting a very close temperature control on the exotherm encountered and the gasoline-distillate yield relationship may be varied as a function of temperature and pressure.
Claims11
In a process for converting syngas to carbon compounds comprising oxygenates and hydrocarbon products wherein syngas is contacted with an iron-containing Fischer-Tropsch catalyst at a temperature with the range of 400.degree. to 600.degree. F. and a pressure within the range of 1-1500 psig so as to achieve high conversion of said syngas to substantial amounts of C.sub.3 + carbon compounds comprising no more than 20% methane plus ethane, and all or a portion of the product of said syngas conversion is passed in contact with an acidic crystalline zeolite having a pore dimension greater than 5 Angstroms, a silica-to-alumina ratio of at least 12, and a constraint index within the range of 1-12 at a temperature of 530.degree.-850.degree. F., a pressure from about 1 atmosphere to about 800 psig, and at a space velocity of from about 0.2 to 30 WHSV so as to promote the formation of gasoline and distillate materials;
- the improvement which comprises increasing the rate of syngas conversion by maintaining a H.sub.2 /CO ratio in the range of 0.5 to 1 and achieving an overall syngas conversion of greater than 60%.
Dependencies are inferred from the claim text.