Method for desulfuration by recombination alkylate catalytic distillation

Abstract

The invention relates to a method for desulfuration by recombination alkylate catalytic distillation. Gasoline material to be desulfurized is separated into a light distillate and a heavy distillate, and the light distillate and the heavy distillate are respectively led to different positions of a catalytic distilling tower, wherein a feed inlet of the light distillate is lower than a feed inlet of the heavy distillate; solid acid catalyst is filled in the catalytic distilling tower, wherein the operation pressure of the catalyst distilling tower is 0.1MPa to 0.5 MPa, the temperature of a reaction area is 80-200 EDG C, and the airspeed of liquid is 0.1h-1 to 20h-1; olefin contained in the gasoline is fully utilized to react with the sulphocompound in the gasoline so as to remarkably improve the boiling point of the sulphocompound, enable the sulfur transfer degree to be higher, effectively remove the sulfur in the gasoline without losing the octane number and achieve the double purposes desulfuration and olefin reduction. The method also has the advantages of little constructing investment, mild operating condition and easy control of the process.

Description

technical field [0001] The invention relates to a desulfurization method using olefin contained in gasoline as an alkylating agent. Background technique [0002] At present, catalytic cracking (FCC) gasoline accounts for more than 75% of gasoline in my country, and brings more than 90% of sulfur impurities into finished gasoline. Therefore, the production of clean gasoline products requires a substantial reduction in the sulfur content of FCC gasoline. Among the sulfides contained in FCC gasoline, mercaptans and thioethers are less, and thiapanes account for more than 80% of the total sulfides. Hydrodesulfurization (HDS) is a widely used FCC gasoline desulfurization technology at present. It can remove many kinds of sulfides and high reaction conversion rate, but the olefins in the light fraction are easily saturated at the same time, which reduces the octane number of gasoline. Alkylation desulfurization refers to contacting gasoline with an acidic catalyst, so that the t...

AI Technical Summary

Problems solved by technology

None of the existing technologies separate low-carbon olefins from low-boiling point thiophene sulfides. In this case, low-carbon olefins can easily react with low-boiling point thiophene sulfides to occupy the substitution position, and the resulting alkylthiophene derivatives The boiling point of the substance is not high enough, so the sulfur transfer effect is not good

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