Method for separating and producing 1,3,5-trimethylbenzene through hydrocracking heavy aromatic hydrocarbons

A technology of mesitylene and hydrocracking, which is applied in the production of bulk chemicals, chemical instruments and methods, hydrocarbons, etc., and can solve problems such as complex processes, low added value of heavy aromatics, and low product purity

Active Publication Date: 2012-10-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is mainly to solve the technical problems such as low added value of heavy aromatics, complex process for separating mesitylene monomer from heavy aromatics, low product purity, and low yield, and provide a new method for hydrogenation of heavy aromatics Method for producing mesitylene by cracking and separating

Method used

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  • Method for separating and producing 1,3,5-trimethylbenzene through hydrocracking heavy aromatic hydrocarbons
  • Method for separating and producing 1,3,5-trimethylbenzene through hydrocracking heavy aromatic hydrocarbons

Examples

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Effect test

Embodiment 1～2

[0023] Binder-free ZSM-5 zeolite (SiO 2 / Al 2 o 3 The molar ratio is 60) prepared with reference to Chinese patent CN100384735C, the prepared binderless ZSM-5 zeolite crushing strength is greater than 75N / particle, the weight content of ZSM-5 zeolite is 98.5%, the product is ion-exchanged with ammonium nitrate solution, and after exchange Carry out roasting and transform into hydrogen-type zeolite. On the hydrogen-type binderless ZSM-5 zeolite, impregnate 0.05% Pt and 0.25% Zn in terms of load weight ratio, and calcinate at 450°C for 4 hours to obtain catalyst a, and the catalyst a after reduction and activation is placed in a fixed-bed reactor Carry out reaction, heavy aromatics raw material is xylene 7.49% by weight percentage; Isopropyl benzene 2.39%; N-propyl benzene 4.00%; 6.82%; 26.86% of mesitylene; 8.43% of trimethylbenzene; 0.94% of indane; 18.22% of hydrocarbons with more than 10 carbons. according to figure 1 The technological process of producing BTX aromatics...

Embodiment 3～5

[0026] Binder-free ZSM-5 zeolite (SiO 2 / Al 2 o 3 The molar ratio is 20) prepared with reference to Chinese patent CN100384735C, the prepared binderless ZSM-5 zeolite has a crushing strength greater than 65N / particle, and the weight content of ZSM-5 zeolite is 99.6%. The product is ion-exchanged with ammonium nitrate solution, and after the exchange Carry out roasting and transform into hydrogen-type zeolite. On the hydrogen-type binderless ZSM-5 zeolite, impregnate 0.005% of Pt and 0.01% of Sn by weight, and calcined at 450°C for 4 hours to obtain catalyst c; on the hydrogen-type binderless ZSM-5 zeolite Impregnate 0.5% of Pd, 0.01% of Zn and 1.0% of La by weight, and calcinate at 450°C for 4 hours to obtain catalyst d; impregnate 0.03% by weight of hydrogen-type binder-free ZSM-5 zeolite Pt, 0.02% Bi and 0.2% Sn were calcined at 450° C. for 4 hours to obtain catalyst e. The catalyst after reduction and activation was reacted in a fixed-bed reactor, and the raw material o...

Embodiment 6～7

[0028] Binder-free ZSM-11 zeolite (SiO 2 / Al 2 o 3 The molar ratio is 45) prepared with reference to Chinese patent CN101348261A, the prepared binderless ZSM-11 zeolite crushing strength is greater than 80N / particle, the weight content of ZSM-11 zeolite is 97.9%, the product is ion-exchanged with ammonium nitrate solution, after exchange Carry out roasting and transform into hydrogen-type zeolite. On the hydrogen-type binderless ZSM-11 zeolite, impregnate 0.06% of Pt and 0.2% of Zn by weight, and calcinate at 450°C for 4 hours to obtain catalyst f; on the hydrogen-type binderless ZSM-11 zeolite Catalyst g was obtained by impregnating 0.2% Pt and 0.20% Bi by weight and calcining at 450° C. for 4 hours. The catalyst after reduction and activation was reacted in a fixed-bed reactor, and the raw material of heavy aromatics was the same as in Example 1. The evaluation conditions and reaction results of the catalyst were shown in Table 1. according to figure 1 The technological...

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Abstract

The invention relates to a method for separating and producing 1,3,5-trimethylbenzene through hydrocracking heavy aromatic hydrocarbons to mainly solve technical problems of low added value of the heavy aromatic hydrocarbons, and complex flow, low product purity, low yield and the like in separation of 1,3,5-trimethylbenzene monomers from the heavy aromatic hydrocarbons. According to the method, hydrogen type binder-free ten-membered ring zeolite loading 0.005-0.5% by mass of Pt or Pd is adopted as a catalyst, hydrogen and the heavy aromatic hydrocarbons which are raw materials undergo hydrocracking treatment, and 1,2,4-trimethylbenzene and heavy aromatic hydrocarbons having boiling points greater than the boiling point of the 1,2,4-trimethylbenzene in products are returned to a reactor, so BTX aromatic hydrocarbon yield increase and 1,3,5-trimethylbenzene separation production are realized. The method well solves the problems, and can be used for the industrial production for yield increases of the BTX (benzene, toluene and xylol) aromatic hydrocarbon and the 1,3,5-trimethylbenzene.

Description

technical field [0001] The invention relates to a method for producing mesitylene by hydrocracking and separating heavy aromatics. Background technique [0002] Heavy aromatics include by-products of steam cracking units and refinery continuous reforming units, mainly carbon nine and carbon ten aromatics, which are valuable petrochemical resources, especially reforming heavy aromatics. With the successive production of continuous reforming units of large petrochemical enterprises in my country in recent years, the output of reformed heavy aromatics has increased rapidly. In addition to the production of paraxylene (PX) in continuous reforming units, heavy aromatics (continuous heavy aromatics) The C9 aromatics in the heavy aromatics in the whole plant are generally used for disproportionation and isomerization with toluene to produce PX), and a considerable part enters the comprehensive utilization production plant of heavy aromatics for processing and application, and is use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/02C07C15/04C07C15/06C07C15/08C07C4/18
CPCY02P20/52
Inventor 王德举刘仲能王燕波郭友娣
Owner CHINA PETROLEUM & CHEM CORP
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