A method for producing high-octane low-benzene gasoline

Abstract

The invention relates to a method for producing high-octane low-benzene gasoline. The benzene-rich gasoline in the refinery is first cut, and the separated carbon five and carbon six components are sent to a hydrogenation unit, and the hydrogenated product is sent to decarbonization. The five-unit separates C5 and C6 components, and the C6 components containing benzene are sent to a multi-stage adiabatic fixed-bed reactor to make benzene contact and react with ethylene in the refinery dry gas first, and the reaction products and unreacted benzene and methanol Continue the reaction to achieve benzene reduction, the products and reactants move down through the catalyst bed of each stage, and the total product is sent to the separation unit for separation to obtain fuel gas, light hydrocarbons, low-benzene aromatics and water, low-benzene aromatics and the separated C5 The components are mixed to form a high-octane low-benzene blended gasoline component. The invention can flexibly adjust the amount of methanol added according to the matching degree between the ethylene content in the refinery dry gas and the benzene content in the refinery benzene-rich gasoline, which can not only fully recover the ethylene in the dry gas, but also meet the requirements for reducing benzene, and at the same time It can also generate high-clean and low-benzene blending gasoline components.

Description

technical field [0001] The invention relates to a method for producing high-octane and low-benzene gasoline by comprehensively utilizing dry gas produced from refinery benzene-rich gasoline (such as catalytic cracking gasoline, reformed gasoline, pyrolysis gasoline, etc.) and catalytic cracking units. Especially when the amount of ethylene in the dry gas of the refinery does not match the amount of benzene in benzene-rich gasoline, the purpose of reducing benzene in the gasoline of the whole plant can be achieved by adding methanol. This process can not only achieve the effect of reducing benzene in gasoline, but also solve the problem of dry gas outlet, which is more in line with the current market situation and economically feasible. Background technique [0002] With the continuous improvement of environmental protection awareness and the increasingly serious pollution of automobile exhaust, the restrictions on automobile exhaust emissions are becoming increasingly strict...

AI Technical Summary

Problems solved by technology

[0006] The purpose of this invention is to provide a method for producing high-octane low-benzene gasoline, comprehensively utilizing refinery benzene-rich gasoline and refinery dry gas and methanol to produce high-octane low-benzene gasoline, to solve the existing Process and refinery dry gas ethylene recovery technology has various problems such as the mismatch between ethylene in refinery dry gas and the excess benzene in refinery benzene-rich gasoline, and the high cost of ethylene recovery in refinery dry gas

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