METHOD FOR PRODUCING GASOLINE WITH DISTRIBUTION OF OXYGENATE AND TWO OLEFIN-CONTAINING FRACTIONS Russian patent published in 2021 - IPC C10G35/95 

FIELD: gasoline production.
SUBSTANCE: invention relates to a method for producing gasoline, in which four streams are used as raw material, the first of which comprises a hydrocarbon fraction which is in the form of a gasoline fraction having a boiling point of not more than 215°C, and the second stream comprises an oxygenate, at least one component selected from the group: methanol, ethanol, dimethyl ether, third flow includes the first olefin-containing fraction, fourth flow includes the second olefin-containing fraction. The first olefin-containing fraction comprises one or more olefins selected from a group comprising ethylene, propylene, butylene, isobutylene, in a total quantity of 10 to 50 wt.% and includes 0.5-8.0 wt.% hydrogen. The second olefin-containing fraction comprises one or more olefins selected from the group comprising propylene, butylene and isobutylene in a total quantity of 50 to 70 wt.% and includes 0 to 5.0 wt.% of C1-C2 hydrocarbons. The inventive method consists in using three reaction zones filled with a zeolite catalyst which comprises ZSM-5-type zeolite. The first flow is fed into at least one reaction zone, the second flow is fed into the first, second and third reaction zones, wherein the mass fraction of the second flow delivered to each subsequent reaction zone is less than the mass fraction of the second flow, the third stream is fed into at least one reaction zone and the fourth stream is fed into at least one reaction zone. The product flow from the first reaction zone is fed into the second reaction zone and the product flow from the second reaction zone is fed into the third reaction zone. The hydrocarbon fraction is 70-83 wt.% of the feedstock, the first olefin-containing fraction is 4-19 wt.% of the feedstock, the second olefin-containing fraction is 3-14 wt.% of the feedstock. The distribution of the second flow between the three reaction zones is 40-85 wt.%/10-35 wt.%/5-25 wt.% of the total amount of the second flow and the catalyst distribution by reaction zones is 17-33 wt.%/28-50 wt.%/33-50 wt.% of the total catalyst for the first/second/third reaction zones respectively.

EFFECT: technical result consists in producing high-octane gasoline with the involvement of low-grade olefin-containing fractions while preserving the yield and quality of the product.
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