Method for upgrading high-olefin FCC (fluid catalytic cracking) gasoline

Abstract

The invention provides a method for upgrading high-olefin FCC (fluid catalytic cracking) gasoline. The method comprises the following steps: prehydrogenating FCC gasoline to obtain prehydrogenated FCCgasoline; cutting the prehydrogenated FCC gasoline into light fraction, medium fraction and heavy fraction; performing etherification or catalytic cracking on the light fraction; performing solvent extraction on the medium fraction to obtain olefin-rich raffinate and arene-rich extracted oil; recovering light olefins from the extracted oil to obtain light olefins and sulfur-rich oil; returning one part of light olefins to a solvent extraction system for backwashing, and performing catalytic cracking reprocessing or selective hydrodesulfurization on the other part of light olefins; performingselective hydrodesulfurization on the heavy fraction and the sulfur-rich oil to obtain desulfurized heavy fraction. With adoption of the method, octane number of a gasoline product can be increased while sulfur content and olefin content are reduced.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a method for upgrading high-olefin catalytic cracking gasoline. Background technique [0002] In recent years, with the impact of pollution problems such as smog and haze caused by automobile exhaust, people's requirements for environmental protection have been increasing day by day. Countries around the world have successively formulated strict new standards for clean gasoline. For example, the Euro V motor gasoline standard promulgated by the European Union in 2011 stipulates that the olefin content is below 18v%, the sulfur content is below 10ppm, and the octane number is maintained above 95; The gasoline standard requires the olefin content to be below 18v%, the sulfur content to be below 10ppm, and the octane number to be above 93. Therefore, the main manifestation of the improvement of gasoline quality standards is to reduce the olefin content an...

AI Technical Summary

Problems solved by technology

Among them, S-zorb is used for the desulfurization of full fraction catalytic gasoline. The sulfur content of gasoline after desulfurization can be controlled below 10ppm, but the loss of octane number of full fraction gasoline is 1.0-2.0 units; RSDS technology first cuts catalytic gasoline into light and heavy Fractions, light fractions are extracted and sweetened, and heavy fractions are selectively hydrodesulfurized. When producing products with a sulfur content of less than 10ppm, the output of light fractions is about 20%, and most of them need hydrogenation. The octane number of full-distillate gasoline The loss is between 3.0-4.0; Prime-G+ adopts the process flow of pre-hydrogenation of whole fraction, splitting of light and heavy gasoline, and selective hydrodesulfurization of heavy fraction. Although some low-sulfur light components do not need hydrotreating, the yield of light components Fewer, most still require hydrotreating, resulting in octane losses between 3.0-4.0 for full distillate gasoline

[0008] Existing technologies for reducing the sulfur content of catalytic cracking gasoline generally have problems such as large proportion of hydrotreating, large loss of octane number, uncoordinated olefin reduction and sulfur reduction when meeting the requirements of deep desulfurization; therefore, there is an urgent need to develop A catalytic cracking gasoline quality upgrading technology that can increase the octane number of gasoline products while maintaining the content of olefins

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