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Application of nanometer ZSM-5 molecular sieve in reaction for preparing methanol by dimethyl ether catalysis and hydrolyzation

A technology of ZSM-5 and molecular sieve, which is applied in the direction of molecular sieve catalyst, hydrolysis preparation, physical/chemical process catalyst, etc., which can solve the problems of poor stability and low activity

Inactive Publication Date: 2009-09-23
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the molecular sieve catalysts currently used are conventional micron-sized particles, and there are problems such as low activity and poor stability during the use of catalysts.

Method used

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  • Application of nanometer ZSM-5 molecular sieve in reaction for preparing methanol by dimethyl ether catalysis and hydrolyzation
  • Application of nanometer ZSM-5 molecular sieve in reaction for preparing methanol by dimethyl ether catalysis and hydrolyzation
  • Application of nanometer ZSM-5 molecular sieve in reaction for preparing methanol by dimethyl ether catalysis and hydrolyzation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Hydrolysis of Dimethyl Ether to Methanol I

[0049] The nanometer ZSM-5 molecular sieve with a silicon-aluminum ratio of 15:1 is used, and the average particle diameter is 400nm. The molar ratio of dimethyl ether to water vapor is 1:0.5, under the conditions of normal pressure (2.5atm) and reaction temperature of 180°C and space velocity of 1000ml / (gcat h), the methanol content in the product aqueous solution is measured The weight concentration is 26.6%, and there is no by-product in the liquid phase. The calculated dimethyl ether conversion rate is 13.8%, which is close to the equilibrium conversion rate. After 50 hours of reaction, the dimethyl ether conversion rate is 12.5%.

Embodiment 2

[0051] Dimethyl ether hydrolysis to methanol II

[0052] The nanometer ZSM-5 molecular sieve with a silicon-aluminum ratio of 130:1 is used, and the average particle diameter is 100nm. The molar ratio of dimethyl ether to water vapor is 1:5, and the reaction is carried out under the conditions of normal pressure (1.5 atm) and reaction temperature of 220°C and a space velocity of 2000ml / (gcat h). The weight concentration is 13.8%, and there is no by-product in the liquid phase. The conversion rate of dimethyl ether is calculated to be 20.9%, and the conversion rate of dimethyl ether after 500 hours of reaction is 18.6%, which shows that the stability is good.

Embodiment 3

[0054] Hydrolysis of Dimethyl Ether to Methanol III

[0055] The nanometer ZSM-5 molecular sieve with a silicon-aluminum ratio of 60:1 is used, and the average particle diameter is 200nm. The molar ratio of dimethyl ether to water vapor is 1:3, and the reaction is carried out under the conditions of normal pressure (1.0atm) and reaction temperature of 290°C and a space velocity of 20000ml / (gcat h). The weight concentration is 18.1%, the calculated dimethyl ether conversion rate is 23.6%, and the dimethyl ether conversion rate is 14.7% after 50 hours of reaction.

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Abstract

The invention discloses the application of nanometer ZSM-5 molecular sieve in the reaction for preparing methanol by dimethyl ether catalysis and hydrolyzation, relating to a method for preparing the methanol by gas-solid phase catalysis, namely, the dimethyl ether, water vapour and the ZSM-5 molecular sieve are mixed to obtain the methanol. The invention also discloses the novel application of the nanometer ZSM-5 molecular sieve.

Description

technical field [0001] The invention relates to the preparation of methanol, in particular to a gas-solid phase catalytic preparation method of methanol. Background technique [0002] Dimethyl ether (DME) is a colorless gas or compressed liquid with a slight ethereal odor. Dimethyl ether is inert at room temperature, not easy to auto-oxidize, non-corrosive, non-carcinogenic, and is a green and environmentally friendly industrial chemical. Dimethyl ether has the characteristics of easy compression, condensation, gasification, and miscibility with many polar or non-polar solvents. It is currently widely used in aerosol product propellants, Freon substitute refrigerants, solvents, etc., and is also used in other chemicals Synthesis, very versatile. DME is also an ideal fuel for automobile engines. Compared with methanol fuel vehicles, there is no problem such as cold start of automobiles. The future development direction of dimethyl ether is to be used as a substitute for au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/10B01J29/40
CPCY02P20/52
Inventor 李平熊刚华朱贻安赵茜陈春波周兴贵
Owner EAST CHINA UNIV OF SCI & TECH
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