Method for producing clean gasoline from catalytic cracking gasoline

Abstract

The invention discloses a method for producing clean gasoline from catalytic cracking gasoline. The method comprises: leading a light fraction lateral line from a stabilization tower middle part of a catalytic cracking absorption-stabilization unit, and conducting light and heavy fraction cutting separation on crude gasoline to obtain light fractions and heavy fractions; subjecting light fractions to alkali-free deodorization, letting the deodorized light fractions and hydrocarbon-rich diesel oil from the absorption-stabilization unit enter a disulfide fractionating tower, thus obtaining light gasoline from the fractionating tower top and extracting medium gasoline from a fractionating tower middle lateral line, mixing the medium gasoline with the heavy fractions obtained at the stabilization tower bottom of the absorption-stabilization unit, then passing the mixture through a hydrogenation protection reactor and a hydrodesulfurization reactor in order, then subjecting the hydrogenated liquid product to gas stripping, and mixing the product with the refined light gasoline, thus obtaining a clean gasoline product or a blending component. The method provided in the invention not only can decrease the mercaptan sulfur content and the total sulfur content of catalytic cracking gasoline, produce a clean gasoline product with qualified sulfur and olefin content, but also can significantly reduce the energy consumption of production equipment and increase the economic benefits of a catalytic cracking gasoline desulfurization device.

Description

technical field [0001] The invention relates to a process for refining light hydrocarbons, more specifically a method for producing clean gasoline by catalytic cracking gasoline, especially a method for producing clean gasoline by reducing the mercaptan sulfur content of catalytic cracking gasoline. technical background [0002] With the rapid development of the automobile industry and increasingly stringent environmental protection requirements, the production of low-sulfur and ultra-low-sulfur clean gasoline has become an inevitable trend in the development of the oil refining industry. Judging from the composition of my country's current gasoline pool, catalytic cracking gasoline components account for 75% to 80%. The sulfur content of catalytic cracking gasoline is usually 100~2000μg / g, and the contribution rate to the sulfur content in the gasoline pool in my country is the highest, reaching more than 98%. Moreover, as the feedstock processed by catalytic cracking deve...

AI Technical Summary

Problems solved by technology

The production process route is longer, and the energy consumption of the processing equipment is higher

The heat of the catalytic cracking process is relatively rich, and is usually used to generate the steam required by the refinery, but most of the heat below 300 ° C cannot be fully utilized, and the cooling load of the device is also increased.

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