Method for producing low-sulfur gasoline

Abstract

The invention discloses a method for producing low-sulfur gasoline, which comprises: (1) introducing a gasoline raw material into a hydrogenation reactor and allowing the gasoline raw material to contact hydrogenation and desulfuration catalysts in the presence of hydrogen and undergo hydrogenation and desulfuration, separating the products of the reactions, and obtaining a hydrogen-rich gas and a gasoline fraction obtained after hydrogenation and desulfuration; and (2) introducing the gasoline fraction obtained after hydrogenation and desulfuration to a reverse flow reactor filled with a sweetening catalyst and allowing the gasoline fraction to pass through a catalyst bed layer from top down and contact with a steam stripping medium introduced from the bottom of the reactor in a reverse flow manner, wherein the regenerated mercaptan in the gasoline fraction discomposes into olefin and hydrogen sulfide on the catalyst, the hydrogen sulfide and light dydrocarbon in the fluid are transferred out of the reaction area with the steam stripping medium, the steam stripping medium which contains the hydrogen sulfide and light dydrocarbon is discharged from the upper part of the reverse flow reactor, and the gasoline product from which the mercaptan is removed is obtained from the bottom of the reactor. When the method provided by the method is used, the gasoline product of which the mercaptan sulfur content is lower than 3mu g / g can be produced, the total sulfur content of the gasoline product is reduced, and the octane number loss is small.

Description

technical field [0001] The present invention relates to a method of desulfurizing gasoline and, more particularly, to a method of refining gasoline using at least one hydrotreating process and at least one only in the absence of hydrogen. Background technique [0002] With the increasingly stringent environmental protection regulations, countries around the world have put forward stricter restrictions on the composition of engine fuels such as sulfur content, vapor pressure, benzene content, total aromatics content, and olefin content, among which the sulfur content in gasoline is particularly strict. my country plans to upgrade the quality of motor gasoline to the National III standard on December 31, 2009, requiring that the sulfur content of gasoline should not exceed 150 μg / g. Beijing has taken the lead in implementing the National IV emission standard in 2008, requiring the sulfur content of gasoline to be further reduced to below 50 μg / g. [0003] FCC gasoline is the ...

AI Technical Summary

Problems solved by technology

Removal of H 2 S can reduce the H in the subsequent hydrodesulfurization reactor 2 S concentration, but the hydrodesulfurization reaction will still produce new H 2 S, cannot completely inhibit the formation of regenerated mercaptans

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