Method for producing high-octane low-benzene gasoline

Abstract

The invention relates to a method for producing high-octane low-benzene gasoline. The method comprises the following steps: cutting refinery benzene-rich gasoline, feeding the separated C5 and C6 components into a hydrogenation unit, feeding the hydrogenated product into a C5 decarburization unit to separate C5 and C6 components, feeding the benzene-containing C6 component into a multi-section adiabatic fixed bed reactor to enable benzene to be in contact reaction with ethylene in refinery dry gas, continuously reacting the obtained reaction product with unreacted benzene and methanol to realize benzene reduction, moving the product and reactants downwards through each section of catalyst bed layer, feeding the total product into a separation unit, separating to obtain fuel gas, light hydrocarbon, low-benzene aromatic hydrocarbon and water, and mixing the low-benzene aromatic hydrocarbon with the separated C5 component to obtain the high-octane low-benzene blended gasoline component. The methanol adding amount can be flexibly adjusted according to the matching degree of the ethylene amount in refinery dry gas and the benzene amount in refinery benzene-rich gasoline, ethylene in thedry gas can be fully recycled, the requirement for benzene reduction can be met, and meanwhile high-cleanness low-benzene blended gasoline components can be generated.

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...

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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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