Catalyst for yield increases of BTX (benzene, toluene and xylol) aromatic hydrocarbons and trimethylbenzene through hydrocracking heavy aromatic hydrocarbons

A technology for BTX aromatics and hydrocracking, which is applied in the direction of molecular sieve catalysts, physical/chemical process catalysts, hydrocarbons, etc., and can solve the problems of long trimethylbenzene monomer flow, difficult separation, and insufficient removal capacity.

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

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the hydrotreating catalyst in the prior art has insufficient ability to remove C9 aromatics except trimethylbenzene in low-value-added heavy aromatics, and the process of rectifying and separating trimethylbenzene monomer from the product is long. Separation is difficult and the technical problem of high cost is to provide a catalyst for increasing the production of BTX aromatics and trimethylbenzene in the hydrocracking of heavy aromatics. The catalyst of this invention has high activity and can effectively remove C9 aromatics except trimethylbenzene. Separating high-purity trimethylbenzene monomers from the product and increasing the production of BTX aromatics solved this problem better

Method used

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  • Catalyst for yield increases of BTX (benzene, toluene and xylol) aromatic hydrocarbons and trimethylbenzene through hydrocracking heavy aromatic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0018] 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 by weight, and calcinate at 450°C for 4 hours to obtain catalyst a; on the hydrogen-type binderless ZSM-5 zeolite Catalyst b was obtained by impregnating 0.3% of Pd and 0.05% of Pb in weight ratio, and calcining at 450° C. for 4 hours.

Embodiment 3～5

[0020] 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.

Embodiment 6～7

[0022] 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.

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Abstract

The invention relates to a catalyst for the yield increases of BTX aromatic hydrocarbons and trimethylbenzene through hydrocracking heavy aromatic hydrocarbons to mainly solve technical problems of insufficient capability of present hydrotreatment catalysts for removing C9 aromatic hydrocarbons except the trimethylbenzene from the heavy aromatic hydrocarbons with low added values, and long flow, difficult separation and high cost in rectification separation of trimethylbenzene monomers from products. According to the invention, hydrogen type binder-free ten-membered ring zeolite loading 0.005-0.5 parts by mass of Pt or Pd is adopted as the catalyst, so the catalyst well solves the problems, and can be used for the industrial production for the yield increases of the BTX aromatic hydrocarbons and the trimethylbenzene with a high added value through hydrocracking the heavy aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a catalyst for increasing the production of BTX aromatics and trimethylbenzene by hydrocracking heavy aromatics. Background technique [0002] Heavy aromatics include by-products of carbon nine and above aromatics in steam cracking units and refinery continuous reforming units, which are valuable petrochemical resources, especially reforming heavy aromatics. With the successive production of continuous reforming units in large petrochemical enterprises in my country in recent years, the output of reformed heavy aromatics has increased rapidly. In the production of xylene (PX), a considerable part of it enters the production plant for the comprehensive utilization of heavy aromatics for processing and application, and is used to extract components such as mesitylene, p-trimethylbenzene, para-trimethylbenzene, and methylethylbenzene. [0003] Foreign countries have started to use this part of resources to produce fine chemical pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J29/44C07C15/02C07C15/04C07C15/06C07C15/08C07C4/18
CPCY02P20/52
Inventor 王德举郭友娣王辉刘仲能
Owner CHINA PETROLEUM & CHEM CORP
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