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Preparation method of catalyst for paraxylene produced by toluene selective disproportionation

A xylene catalyst and toluene technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of unevenness, small molecular sieve particles, high B/X value, etc., and achieve good technical effects and conversion The effect of high efficiency and high selectivity

Active Publication Date: 2006-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problems to be solved by this invention In the prior art, ZSM-5 molecular sieves synthesized by organic amine templates have many side reactions in the prepared catalyst, high B / X value, and low p-xylene yield in toluene disproportionation selective reaction products ; The requirements for environmental operating conditions are high, and the amount of waste water containing organic amines is large; the molecular sieves synthesized by inorganic amines are small and uneven, and the catalytic selectivity of the prepared catalysts is low. The preparation method of toluene catalyst

Method used

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

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Effect test

Embodiment 1

[0019] 500 grams of water glass (by weight percentage, containing SiO 2 26.1%, Na 2 (07.4%), add 350 grams of water and mix evenly, then get 47 grams of aluminum sulfate octadecahydrate, 20 grams of 98% concentrated sulfuric acid, and after 600 grams of water dissolve, join in the water glass, stir for 15 minutes and transfer to 2 liters In the stainless steel reactor of volume, add 200 milliliters of concentrated ammonia water and 25 gram ethylamines (weight 65%) again. Crystallize at 170°C for 60 hours, then filter out the crystallized product, wash with water for several times, and dry it. It is identified as ZSM-5 molecular sieve by X-ray phase, and the analysis result is consistent with the ZSM-5 literature data:

[0020] d() 11.4 10.3 3.9 3.8 3.7

[0021] I / I 0 strong strong strong strong strong

[0022] The synthesized sodium form ZSM-5 was exchanged into ammonium form by conventional methods. Chemical analysis gave a silicon to aluminum ratio of 30.

[0023...

Embodiment 2

[0025] 600 grams of water glass (by weight percentage, containing SiO 2 25.8%, Na 2 (07.3%), add 450 grams of water and mix uniformly, then get 58 grams of aluminum sulfate octadecahydrate, 25 grams of 98% vitriol oil, 600 grams of water and 5 grams of ZSM-5 crystal powder synthesized by this method are added to In water glass, after stirring for 15 minutes, transfer it to a stainless steel reaction kettle with a volume of 2 liters, and then add 40 g of liquid ammonia and 30 g of triethylamine solution and then seal the tank. Crystallize at 170°C for 60 hours, then filter out the crystallized product, wash it with water for several times, and dry it. It is identified as ZSM-5 molecular sieve by X-ray phase. The silicon-aluminum ratio of the molecular sieve was obtained as bulk 27.8, and the synthesized sodium form ZSM-5 was exchanged into ammonium form according to the conventional method.

[0026] Get 40 grams of ammonium type ZSM-5 former powders obtained above and add 25 gr...

Embodiment 3

[0028] 600 grams of water glass (by weight percentage, containing SiO 2 25.2%, Na 2 (07.2%), add 450 grams of water and mix uniformly, then get 58 grams of aluminum sulfate octadecahydrate, 25 grams of 98% vitriol oil, 600 grams of water and 5 grams of ZSM-5 crystal powder synthesized by this method are added to In water glass, after stirring for 15 minutes, transfer to a stainless steel reactor with a capacity of 2 liters, then add 50 g of ammonium chloride and 25 g of dipropylamine solution and then seal the tank. Crystallize at 170°C for 60 hours, then filter out the crystallized product, wash it with water for several times, and dry it. It is identified as ZSM-5 molecular sieve by X-ray phase. The silicon-aluminum ratio of the molecular sieve was obtained as bulk 24, and the synthesized sodium-form ZSM-5 was exchanged for the ammonium form according to conventional methods.

[0029] Get 40 grams of ammonium type ZSM-5 former powders obtained above and add 25 grams of sil...

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Abstract

The invention relates to a method for preparing dimethylbenzene catalyst via toluene selective disproportionation, which can solve the problems of much side reaction, high B / X value, and lower collection rate of dimethylbenzene in former technique. The invention uses organic amine-inorganic amine composite mould agent (the weight proportion by weight: organic amine / inorganic amine=0.05-100) to synthesize ZSM-5 molecular screen, and the technique of preparing catalyst via changing the property of organic silicon. And 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 producing p-xylene by shape-selective disproportionation of toluene. 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. Most of the patents now use ZSM-5 molecular sieve as the main body of the reaction. ZSM-5 zeolite consists of 10-membered silicon-oxygen rings to form a pore system with three-dimensional channels. The pore size characteristics of ZSM-5 zeolite allow rapid diffusion of p-xylene with a molecular diameter of 0.63 nm, while the diffusion coefficients...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C5/00C07C6/12C07C15/08
CPCY02P20/52
Inventor 朱志荣李为杨为民陈庆龄祁晓岚
Owner CHINA PETROLEUM & CHEM CORP