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Method for preparing catalyst of para xylene through methylation of toluene

A technology of xylene catalyst and tolyl methyl group, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of large amount of wastewater containing organic amines, low catalytic selectivity of catalysts, and environmental operating conditions. high problems, to achieve the effect of good catalytic activity and selectivity, high crystallinity, and excellent catalytic performance

Active Publication Date: 2008-08-06
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 the present invention In the prior art, ZSM-5 molecular sieves synthesized by organic amine templates have high requirements on environmental operating conditions and a large amount of waste water containing organic amines; the molecular sieves synthesized by ethers have small and uneven particles, and the catalyst prepared The problem of low catalytic selectivity of the toluene methylation to provide a new preparation method of p-xylene catalyst

Method used

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  • Method for preparing catalyst of para xylene through methylation of toluene
  • Method for preparing catalyst of para xylene through methylation of toluene
  • Method for preparing catalyst of para xylene through methylation of toluene

Examples

Experimental program
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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 30 grams of aluminum sulfate octadecahydrate, 20 grams of 98% concentrated sulfuric acid, and after dissolving 600 grams of water, add it to the water glass, stir it for 15 minutes and transfer it to 2 liters In the stainless steel reactor of volume, add 250 milliliters of concentrated ammonia water, 8 grams of methyl ethers and 85 grams of 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...

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 25 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 reaction kettle with a volume of 2 liters, and then add 40 grams of liquid ammonia, 50 grams of ether and 12 grams of triethylamine solution and seal the can. 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 65, and the synthesized sodium-form ZSM-5 was exchanged for the ammonium form according to the conventional method.

[0026] Get 40 grams of the above-mentioned obtained ammonium type...

Embodiment 3

[0028] 600 grams of water glass (by weight percentage, containing SiO2 25.2%, Na 2 (07.2%), add 450 grams of water and mix uniformly, then get 12 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 reaction kettle with a volume of 2 liters, and then add 50 grams of ammonium chloride, 80 grams of ether and 10 grams of dipropylamine solution and seal the can. 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 147, and the synthesized sodium-form ZSM-5 was exchanged for the ammonium form according to the conventional method.

[0029] Get 40 grams of the above-mentioned obtained ammonium ty...

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Abstract

A catalyst for methylating toluene to prepare xylene with high selectivity and low requirement to environment features that the combined organic amine-ether template is used to prepare ZSM-5 molecular sieve, and said ZSM-5 molecular sieve is then modified by organosilicon.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for producing p-xylene through methylation of toluene, in particular to a preparation method of a catalyst for producing p-xylene through methylation of toluene and methanol. Background technique [0002] The alkylation reaction of toluene is one of the most promising reactions for industrial applications. It can convert toluene into p-xylene with high concentration of application value, and it also provides an effective way for rational utilization of methanol. 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 of ortho-xylene and m-xylene with a molecular diameter of 0.69 nm are much lower. In th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C2/00C07C15/00C07C6/12C07C15/08
CPCY02P20/52
Inventor 邹薇孔德金朱志荣李为侯敏杨德琴
Owner CHINA PETROLEUM & CHEM CORP
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