Toluene selective disproportion and toluene and C9 and its above aromatic disproportion and alkyl transfusion method

Abstract

The toluene is selectively disproportionated to obtain the mixed xylene containing high-concentration p-xylene. Then the C9 and C9+x arylhydrocarbon and toluene take part in disproportionation and alkyl transfer reaction to prepare benzene and thermodynamically balanced mixed xylene. The advantages are less circulation of arylhydrocarbon, low energy consumption, and low requirement to raw materials.

Description

technical field [0001] The present invention relates to the selective disproportionation of toluene and the disproportionation and alkylation method of toluene and carbon nine and above aromatics, especially about the selective disproportionation of toluene and toluene and carbon nine and above aromatics (C 9 + A) disproportionation and transalkylation reaction, and then through carbon eight aromatics (C 8 A) Isomerization technology and p-xylene separation technology, the method of producing p-xylene (PX). Background technique [0002] P-xylene is one of the main basic organic raw materials in the petrochemical industry. It is widely used in many chemical production fields such as chemical fibers, synthetic resins, pesticides, medicines, and plastics. Traditional p-xylene production methods such as figure 1 As shown, the thermodynamic equilibrium xylene containing ethylbenzene generated by catalytic reforming of naphtha is C8 aromatics (C ...

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the shortcomings of low concentration of p-xylene in mixed xylene, high energy consumption or harsh requirements for reaction raw materials in the production of p-xylene in the previous literature, and to provide a new toluene selection Sexual disproportionation and disproportionation and transalkylation of toluene with carbon nine and above aromatics

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