Method for deep desulfurization olefin hydrocarbon reduction of inferior gasoline

Abstract

The invention discloses a gasoline deep desulphurization and olefin reduction method, comprising that the gasoline raw material and hydrogen are contacted with hydrogenation absorption desulphurization and olefin aromatization difunctional catalyst to remove sulfur in the gasoline and reduce the olefin content in the gasoline product. The method of the invention can produce gasoline product with the sulfur content lower than 50 micrograms per gram, and can further produce gasoline product with the sulfur content lower than 10 micrograms per gram while the olefin content is lower than 20v%, and meanwhile the antiknock quality index loss is low. The method of the invention can be applied to deep desulphurization and olefin reduction process of FCC gasoline, catalytic pyrolysis gasoline, coker gasoline, pyrolysis gasoline and pressure gasoline or the mixed gasoline raw material thereof.

Description

technical field [0001] The invention belongs to a method for deeply desulfurizing and reducing olefins in gasoline, in particular to a method for producing high-quality gasoline by deeply desulfurizing and reducing olefins in inferior gasoline raw materials under the condition of hydrogen. technical background [0002] With the continuous enhancement of people's awareness of environmental protection, the emission of toxic and harmful substances in automobile exhaust will be strictly controlled, so the quality requirements of oil products used as engine fuels are becoming more and more stringent. For this reason, various countries have put forward extremely stringent restriction indicators on motor gasoline specifications such as oxygen content, vapor pressure, benzene content, total aromatics content, boiling point, olefin content and sulfur content, in order to reduce the emission of harmful substances. The main problem in comparing the quality of gasoline in my country is ...

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Problems solved by technology

However, there are problems such as low liquid yield and waste lye treatment in this method.

[0008] For FCC gasoline with high olefin content and low aromatic content, when the existing hydrogenation technology is used for treatment, the olefin saturation rate is high, resulting in a large loss of octane number

Using the above method of cutting gasoline raw materials into light and heavy fractions, the light fraction is sweetened by alkali refining, the heavy fraction is hydrofined, and then the octane number is restored to process FCC gasoline. The liquid yield is low, the mercaptan content rises, and the total sulfur The content cannot be lower than 50μg / g, and there are problems such as waste lye treatment

However, using the above-mentioned adsorption desulfurization method alone cannot treat FCC gasoline with high olefin content.

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