Method and system for producing heavy naphtha rich in light aromatics from heavy aromatics

Abstract

The invention relates to a method and system for producing heavy naphtha rich in light aromatic hydrocarbon from heavy aromatic hydrocarbon. The method mainly solves the problem of low naphtha aromatic hydrocarbon purity when aromatic hydrocarbon is used as a target product in the prior art. The method comprises the following steps: carrying out hydrofining on a catalytic diesel oil stream to separate impurities, carrying out a hydrocracking reaction, and separating after the reaction to obtain fractions comprising light hydrocarbons, heavy naphtha rich in light aromatic hydrocarbons and heavytail oil, wherein the hydrocracking catalyst comprises the following components in parts by weight: a2) 5-80 parts of solid acid zeolite, b2) 0.05 to 8 parts of a group VIII metal, c2) 3 to 25 partsof VIB group metal oxide, d2) 0.1 to 2 parts of VIB group metal sulfide, and e2) 20 to 95 parts of a first binder. The method can be used for producing heavy naphtha containing high-quality light aromatic hydrocarbons from catalytic cracking light diesel oil, solves the problem of low purity of hydrocracking aromatic hydrocarbons, and achieves a good technical effect.

Description

technical field [0001] The invention relates to the technical field of petroleum catalytic cracking, in particular to a hydrocracking method and system for producing heavy naphtha rich in light aromatics from heavy aromatics. Background technique [0002] Benzene and p-xylene (PX) are important basic organic chemical raw materials, which are widely used in the production of polyester, chemical fiber and other products. They are closely related to the development of the national economy and people's basic necessities of life. The demand has been strong and increasing rapidly in recent years. There are two main process routes for the source of aromatics raw materials: one raw material route is to obtain aromatics raw materials through catalytic reforming of naphtha and extraction of aromatics; the other raw material route is to hydrogenate pyrolysis gasoline, a by-product of the ethylene plant, and extract aromatics Obtain aromatic hydrocarbon raw materials, so as to convert l...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem in the prior art that the purity of light aromatics in heavy naphtha fractions is too low when light aromatics are used as target products, the present invention provides a method for producing heavy naphtha rich in light aromatics from heavy aromatics. Aromatic raw materials are sequentially hydrotreated and selectively converted to produce heavy naphtha with high purity light aromatics, and good technical results have been achieved

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