Method for preparing synthetic liquid hydrocarbons from CO and H₂

摘要

The invention relates to synthesis of liquid C5 and higher hydrocarbons from CO and H2 according to the Fischer-Tropsch synthesis. An object is to provide high syngas conversion rate, minimum content of waxes in the products, high content of C10-C20 fractions per pass within a single reactor and avoidance of use of expensive catalyst components. The claimed method for preparing synthetic liquid hydrocarbons by catalytic conversion of a syngas according to the Fischer-Tropsch synthesis comprises sequential passing the reaction mixture through at least four layers of a multilayer fixed bed of granulated catalysts, wherein a first layer in the direction of passing the reaction mixture comprises a cobalt Fischer-Tropsch synthesis catalyst that provides occurring the Fischer-Tropsch synthesis at Anderson-Schulz-Flory factor of 0.67 to 0.96, a second layer in the direction of passing the reaction mixture comprises a traditional cobalt Fischer-Tropsch synthesis catalyst that provides occurring the Fischer-Tropsch synthesis at Anderson-Schulz-Flory factor of 0.82 to 0.96, a third layer in the direction of passing the reaction mixture comprises not less than 30% of H-form zeolite, and a lowermost layer comprises a traditional cobalt Fischer-Tropsch synthesis catalyst that provides occurring the Fischer-Tropsch synthesis at Anderson-Schulz-Flory factor of 0.82 to 0.96. The cobalt Fischer-Tropsch synthesis catalyst of the first layer has thermal conductivity not less than 4 watt/m·K and comprises not more than 10% of skeleton cobalt to decrease heat generation intensity in the front layer and not less than 20% of H-form zeolite.

主权项

1. A method for preparing synthetic liquid hydrocarbons by catalytic conversion of a syngas according to the Fischer-Tropsch synthesis in a multilayer fixed bed of granulated catalysts comprising:
passing a reaction mixture sequentially through at least four layers of said fixed bed, wherein: a first layer in the direction of passing the reaction mixture comprises a cobalt Fischer-Tropsch synthesis catalyst that comprises skeleton cobalt and that catalyzes Fischer-Tropsch synthesis at an Anderson-Schulz-Flory factor of 0.67 to 0.96, wherein the first layer has thermal conductivity of not less than 4 W/m/K, a second layer in the direction of passing the reaction mixture comprises a cobalt Fischer-Tropsch synthesis catalyst that catalyzes Fischer-Tropsch synthesis at an Anderson-Schulz-Flory factor of 0.82 to 0.96, a third layer in the direction of passing the reaction mixture comprises not less than 30% of H-form zeolite, and a lowermost layer comprises a cobalt Fischer-Tropsch synthesis catalyst that catalyzes Fischer-Tropsch synthesis at an Anderson-Schulz-Flory factor of 0.82 to 0.96.