METHOD OF PRODUCING LIGHT GASOLINE WITH LOW SULFUR CONTENT Russian patent published in 2017 - IPC C10G53/02 C10G35/06 

FIELD: chemistry.

SUBSTANCE: method includes the following steps: a) conducting a demercaptization step by attaching, at least, a portion of the mercaptans to the olefins by contacting the gasoline with, at least, the first catalyst at a temperature of 50 to 250°C, a pressure of 0.4 to 5 MPa, and a liquid space velocity (LHSV) of 0.5 to 10 h^-1. The first catalyst is presented in a sulfided form and comprises the first carrier, at least, one metal selected from group VIII, and, at least, one metal selected from group VIb of the Periodic Table of Elements, a weight percent expressed as the equivalent of metal oxide selected from group VIII, with respect to the total weight of the catalyst, is from 1 to 30%, and the weight percent expressed in the equivalent of metal oxide selected from group VIb is from 1 to 30% based on the total weight of the catalyst; b) carrying out the step of treating the gasoline from step a) with hydrogen in a distillation column comprising, at least, one reaction zone containing, at least, one second catalyst comprising the second carrier and, at least, one metal from group VIII. The conditions in step b) are selected such that the following operations are carried out simultaneously in the said distillation column: I) distillation with the separation of gasoline from step a) into a light gasoline fraction with a reduced content of sulfur-containing compounds and a heavy gasoline fraction having a higher boiling point, than light gasoline, and containing most of the sulfur-containing compounds, the light gasoline fraction being withdrawn at a point above the reaction zone, and the heavy gasoline fraction is withdrawn at a point located under the reaction zone; II) contacting the gasoline fraction from step a) with the second catalyst to carry out the following reactions: (i) thioetherification by attaching a portion of the mercaptans to a portion of the diolefins to produce thioethers, (ii) selective hydrogenating a portion of the diolefins to olefins and, optionally, (iii) isomerization of olefins.

EFFECT: method helps to produce a light gasoline fraction.

14 cl, 2 dwg