Method for reducing gasoline sulfur content

Abstract

Relating to the field of hydrocarbon oil refining, the invention discloses a method for reducing the gasoline sulfur content. The method includes: fractionating a gasoline raw material into light fraction gasoline, medium fraction gasoline and heavy fraction gasoline, letting the light fraction gasoline firstly enter an alkaline extraction unit for removal of mercaptan, then mixing the mercaptan removed light fraction gasoline with medium gasoline fraction, and letting the mixture enter a solvent extraction unit; or letting the medium gasoline fraction firstly enter the solvent extraction unit, then mixing the obtained product and the light gasoline fraction, and subjecting the mixture to the alkaline extraction unit; letting the extract oil obtained by the solvent extraction unit and theheavy fraction gasoline enter a first reaction zone and a second reaction zone in order, and separating the reaction effluent of the second reaction zone to obtain hydrogenated heavy fraction gasoline; and mixing the treated light gasoline fraction and the medium gasoline fraction with the hydrogenated heavy fraction gasoline so as to obtain a gasoline product. The gasoline product obtained by themethod provided by the invention has the advantages of low sulfur content, small octane loss value and high gasoline yield.

Description

technical field [0001] The invention relates to the field of refined hydrocarbon oil, in particular to a method for reducing the sulfur content of gasoline, and more specifically to a method for reducing the sulfur content in high-sulfur and high-olefin gasoline raw materials to produce ultra-low sulfur gasoline. Background technique [0002] With the rapid increase of the number of automobiles in our country, the problem of air pollution caused by automobile exhaust emissions is becoming more and more serious. [0003] The pollutants emitted by automobile exhaust mainly include SOx and NOx. Such pollutants will not only cause acid rain, but also destroy the ozone layer, and NOx can also cause cancer in the human body, causing great harm to humans and the environment. Sulfur in gasoline can poison automobile exhaust gas purification catalysts, seriously affecting its ability to treat exhaust pollutants. Therefore, countries all over the world have formulated more and more ...

AI Technical Summary

Problems solved by technology

[0013] 1. The olefins in the raw material contribute a lot to the octane number, and the saturation of the olefins causes a large loss of the octane number;

[0014] 2. High sulfur content requires deep hydrodesulfurization, resulting in high olefin saturation;

[0015] 3. When producing National V gasoline, the cutting ratio of light and heavy gasoline is adjusted forward, resulting in an increase in the proportion of heavy gasoline that needs to be hydrotreated, and the olefin content in heavy gasoline is also further increased, and the loss of octane number is increased;

[0016] 4. When producing National V gasoline, the requirements for cutting precision and lye extraction operation are higher. If a small amount of non-mercaptan sulfur is cut into light gasoline, it will result in failure to produce National V gasoline products

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