A kind of method combining catalytic cracking and gasoline hydrogenation

Abstract

The invention provides a method for combining catalytic cracking and gasoline hydrogenation, which comprises the following steps: subjecting catalytic cracking raw materials to catalytic cracking reaction, and then performing fractionation, separation, analysis, absorption and stabilization in sequence to obtain dry gas, liquefied gas, Light naphtha, diesel oil and oil slurry; 60-70wt% of light naphtha and gasoline are sequentially separated by gasoline hydrogenation reaction and gasoline hydrogenation to obtain external materials and reuse materials; distillation range of light naphtha Control the C3+C4 content <1wt%, dry point <70℃; the distillation range of the recycled material controls the initial boiling point>40℃, the final boiling point 90~101℃; the light naphtha is 30%~40℃ % and recycled materials are returned to continue the catalytic cracking reaction. In the method, 30% to 40% of the light naphtha is subjected to catalytic cracking reaction together with the recycled material and the catalytic cracking raw material, so that the liquefied gas yield and the propylene content in the liquefied gas are both improved, and the ethylene content in the dry gas is also significantly increased.

Description

technical field [0001] The invention belongs to the technical field of oil refining and chemical industry, and particularly relates to a method for combining catalytic cracking and gasoline hydrogenation. Background technique [0002] The main raw materials used in catalytic cracking are atmospheric and vacuum wax oil, coking wax oil, fuel oil, etc., which are reacted under the action of high temperature catalysts, and dry gas, liquefied gas, gasoline, diesel oil, oil slurry, etc. are obtained through fractionation system and absorption stabilization system. product. Under the guidance of national policies and the conversion of new and old kinetic energy, the profit margin of gasoline and diesel oil refining units has declined. In recent years, the technical focus has been on optimizing the product distribution of catalytic cracking units, increasing the production of low-carbon olefins, especially the content of propylene in liquefied gas and ethylene in dry gas . [0003...

AI Technical Summary

Problems solved by technology

[0003] The gasoline produced by the catalytic cracking unit is sent to the gasoline hydrogenation unit for selective hydrogenation of the whole fraction first, and then qualified gasoline products are obtained through rectification and extraction. With the upgrading of the national gasoline standard, the olefin content in gasoline is strictly controlled, but At present, the content of olefins in the gasoline of the whole plant is relatively high, which affects oil adjustment. It is necessary to reduce the content of olefins in gasoline of the whole plant through technical optimization

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