Catalytic cracking and gasoline hydrogenation combined method

Abstract

The invention provides a catalytic cracking and gasoline hydrogenation combined method which comprises the following steps: carrying out a catalytic cracking reaction on a catalytic cracking raw material, and sequentially carrying out fractionation, separation, desorption, absorption and stabilization to obtain dry gas, liquefied gas, light naphtha, diesel oil and slurry oil; 60-70 wt% of light naphtha and gasoline are sequentially subjected to a gasoline hydrogenation reaction and gasoline hydrogenation separation, and a delivery material and a recycling material are obtained, wherein the distillation range of the light naphtha controls the content of C3 + C4 to be less than 1wt% and the dry point to be 70 DEG C, the distillation range of the recycled material controls the initial boilingpoint to be more than 40 DEG C and the final boiling point to be 90-101 DEG C; 30%-40% of the light naphtha and the recycled material return to continue the catalytic cracking reaction. According tothe method, 30-40% of light naphtha, a recycled material and a catalytic cracking raw material are subjected to a catalytic cracking reaction together so that the yield of liquefied gas and the content of propylene in the liquefied gas are both increased, and the content of ethylene in dry gas is also obviously increased.

Description

technical field [0001] The invention belongs to the technical field of refining and chemical industry, and in particular 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 gas oil, coker gas oil, fuel oil, etc., which react under the action of high-temperature catalysts, and obtain dry gas, liquefied gas, gasoline, diesel oil, oil slurry, etc. 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 margins of gasoline and diesel oil refining units have declined. In recent years, the technical focus has been on optimizing the product distribution of catalytic cracking units and increasing the production of low-carbon olefins, especially the content of propylene in liquefied gas and ethylene in dry gas. . [0003] The gasol...

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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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