Preparation method of catalyst for paraxylene produced by toluene selective disproporationation

A xylene catalyst and selectivity technology, which is applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of less mesopores, affecting the diffusion rate of reaction products, affecting reaction activity and selectivity, etc. , to achieve the effect of increasing the diffusion ability

Active Publication Date: 2008-06-04
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that there are few mesopores in the catalyst particles in the prior art, which affects the diffusion rate of the reaction product, thereby affecting the reaction activity and selectivity. A new catalyst for the selective disproportionation of toluene to p-xylene is provided. preparation method

Method used

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  • Preparation method of catalyst for paraxylene produced by toluene selective disproporationation
  • Preparation method of catalyst for paraxylene produced by toluene selective disproporationation
  • Preparation method of catalyst for paraxylene produced by toluene selective disproporationation

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Effect test

Embodiment 1

[0016] Get 40 grams of ammonium hydrogen type ZSM-5 former powder and add 25 grams of silica sol (by weight percentage, containing SiO 2 40%) and 5 milliliters of EO-PO copolymer nonionic surfactants, kneaded and extruded into strips, dried and baked at 500°C for 2 hours to obtain the shaped catalyst precursor A without shape-selective treatment, wherein EO is ring Ethylene oxide, PO is propylene oxide.

Embodiment 2

[0018] Get 40 grams of ammonium hydrogen type ZSM-5 former powder and add 25 grams of silica sol (by weight percentage, containing SiO 2 40%) and 3.0 grams of hay powder (below 200 orders), kneaded and extruded into strips, dried at 500 ° C for 2 hours to obtain the shaped catalyst precursor B without shape-selective treatment.

Embodiment 3

[0020] Get 50 grams of catalyst precursor A, add 48 milliliters of n-hexane and 2.5 grams of benzyl silicone oil (average molecular weight about 600) as the solution, and distill off n-hexane in an oil bath at 90°C. The residue after evaporating to dryness was heated up to 500° C. in a muffle furnace, kept for 3 hours, and then naturally cooled to obtain a catalyst subjected to a shape-selective treatment. Repeat the above-mentioned silicone oil modification treatment process to obtain a finished catalyst product C, the catalyst mesopore part ( ≥20A) pore volume 0.22 ml / g.

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Abstract

The invention relates to a method for preparing dimethylbenzene catalyst via toluene selective disproportionation, which can solve the problems that lower central pore number in the catalyst grains which will affect the diffusion rate of reaction product, the reaction activity and selection, in former technique. The invention solves aforementioned problem via adding the hole-enlarge agent of liquid organic compound or solid powder organic compound containing carbon, oxygen and nitrogen in the catalyst molding process, to prepare the catalyst parent body; then using phenylmethyl silicon oil to process the organic silicon deposition surface treatment to produce the catalyst. The invention can be used in the commercial manufacture of toluene selective disproportionation.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for the selective disproportionation of toluene to p-xylene. Background technique [0002] Toluene disproportionation reaction is one of the common reactions in industry. It can convert toluene into benzene and xylene with higher application value. The xylene product is an equilibrium composition mixture of its three isomers, and the most valuable p-xylene Only 24%. Therefore, someone proposed a new process of shape-selective disproportionation, so that the reaction system can selectively generate p-xylene. Conventional toluene disproportionation catalysts use mordenite as the main active component. Due to the large pore diameter of mordenite, the three isomers of p-xylene cannot achieve the shape-selective effect. Since ZSM-5 was synthesized in the early 1970s, it has been widely valued due to its unique catalytic performance for reactions such as alkylation, isomerization, disproportionati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C6/12C07C5/22C07C15/08
CPCY02P20/52
Inventor 陈庆龄侯敏朱志荣孔德金张荣程文才
Owner CHINA PETROLEUM & CHEM CORP
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