METHOD OF PRODUCING HYDROCARBON GASOLINE FRACTIONS FROM SYNTHESIS GAS DILUTED WITH NITROGEN AND CARBON DIOXIDE Russian patent published in 2014 - IPC C07C1/04 C10G2/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing hydrocarbon gasoline fractions from synthesis gas, having volume ratio H₂/(CO+CO₂) of 1-3, by contacting, at temperature of 360-440°C and pressure of 100 atm, with a bifunctioanal catalyst containing a ZSM-5 or ZSM-11 zeolite which contains 0.1-1 wt % iron, and a metal oxide component consisting of Zn, Cr and W oxides, wherein content of N₂ in the synthesis gas ranges from more than 10 to 20 vol. % and content of CO₂ ranges from 1 to 15 vol. %. Wherein total content of N₂ and CO₂ in the synthesis gas is not more than 30 vol. %, and the volume ratio of components (H₂-CO₂)/(CO+CO₂) is in the range of 1.7-2.3, and the process of converting synthesis gas is carried out with not less than 15 circulations. The invention also relates to a method where a stream of synthesis gas, having volume ratio of components (H₂-CO₂)/(CO+CO₂) less than 1.7, with content of N₂ from 20 to 30 vol. % and content of CO₂ from 1 to 15 vol. %, is divided into two streams, followed by separating H₂ from the first stream and adding to the second stream in an amount which enables to lower content of N₂ in the second stream to concentration lower than 20 vol. % and increase volume ratio of components (H₂-CO₂)/(CO+CO₂) in the second stream to 1.7-2.3, which is then fed for contacting with the bifunctional catalyst with not less than 15 circulations, wherein the first stream is taken for burning after separating H₂.

EFFECT: obtaining gasoline fractions with low concentration of benzene, high selectivity on C₅ hydrocarbons and methane.

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