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Catalyst for producing dimethyl ether and its preparation method and application

A catalyst and a technology for dimethyl ether, which are applied to the catalyst for the production of dimethyl ether and the fields of preparation and application, can solve the problems of high reaction temperature, high process operation temperature, unfavorable environment, etc. easy effect

Inactive Publication Date: 2009-01-21
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid phase method produces dimethyl ether, although the investment is small, but because the liquid acid is corrosive, it will cause great pollution to the environment, so it tends to be eliminated
[0005] And US4595785 has proposed the gamma-Al that is modified with aluminum titanate 2 o 3 As a dehydration catalyst to synthesize dimethyl ether, it can increase the reaction speed and reduce side reactions and coking, but the reaction temperature is as high as 300-400 °C
CN1613558A has reported the process of modifying alumina with sulfate and being used for the dehydration of methanol to produce dimethyl ether. Although a good reaction result can be obtained at a lower temperature, there is the existence of sulfate in the catalyst preparation process, and mass production is harmful to Unfavorable environment
CN1830934A describes the process of methanol dehydration to dimethyl ether, but its process operating temperature is high
The composite solid acid catalyst that CN1125216A adopts is made up of aluminosilicate, aluminum oxide and the mixed metal oxide of lanthanum, manganese, silicon, and its preparation method is comparatively loaded down with trivial details; The multistage cold-shock type adiabatic reactor that this method adopts, because catalyst bed layer The reaction temperature difference is large, which reduces the selectivity of the product and the service life of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1 Catalyst is produced by Changling Petroleum Refining and Chemical Co., Ltd. Catalyst Factory γ-Al 2 o 3 , ThO produced by Shanghai Youhua Chemical Co., Ltd. 2 , Ga produced by Hunan Huaihua Yinhuan Smelting Co., Ltd. 2 o 3 , ZrO produced by Xiaqian Zirconia Factory in Yangquan City, Shanxi Province 2 , PS-AO produced by Hubei Haizhijie Chemical Technology Co., Ltd. 2 Alumina with small pores was crushed to 250 mesh, and the catalyst precursor was composed at a weight percentage of 60:15:5:5:15, stirred for 12 hours, shaped, dried at 80°C, and calcined at 500°C to obtain a catalyst.

[0016] The refined methanol from the top of the methanol rectification tower enters the dimethyl ether synthesis tower from the top of the dimethyl ether synthesis tower, at 260°C for 0.9h -1 , 0.6MPa reaction conditions and under the action of the catalyst, the dehydration of methanol to dimethyl ether occurs. The conversion of methanol reached 75.68 (mol%).

[0017] Th...

Embodiment 2

[0019] Example 2 The catalyst is HX001 activated alumina produced by Pingxiang Xingchen Industry Co., Ltd., and ThO produced by Taojiang Jinlong Rare Earth Materials Co., Ltd. 2 , Ga produced by Zibo Baida Chemical Co., Ltd. 2 o 3 , ZrO produced by Shandong Hengjia Pharmaceutical Development Co., Ltd. 2 , PS-AO produced by Hubei Haizhijie Chemical Technology Co., Ltd. 2 Alumina with small pores was crushed to 220 mesh, and the catalyst precursor was composed at a weight percentage of 70:1:1:8:20, stirred for 24 hours, shaped, dried at 120°C, and calcined at 400°C to obtain a catalyst.

[0020] The refined methanol coming out of the top of the methanol rectification tower enters the dimethyl ether synthesis tower from the top of the dimethyl ether synthesis tower, and under the action of the catalyst, the reaction of methanol dehydration to dimethyl ether occurs. At 320°C, 0.8h -1 , 0.4MPa reaction conditions, methanol conversion rate reached 70.52 (mol.%).

[0021] The re...

Embodiment 3

[0023] Example 3 The catalyst is γ-Al produced by Changling Petroleum Refining and Chemical Co., Ltd. Catalyst Factory 2 o 3 , ThO produced by Guangdong Zhongxin Economic and Trade Development Co., Ltd. 2 , Ga produced by Zibo Baida Chemical Co., Ltd. 2 o 3 , ZrO produced by Tianjin Guangfu Fine Chemical Research Institute 2 , PS-AO produced by Hubei Haizhijie Chemical Technology Co., Ltd. 2 Alumina with small pores was crushed to 200 mesh, and catalyst precursor was composed at a weight percentage of 60:2:12:1:25, stirred for 20 hours, shaped, dried at 100°C, and calcined at 350°C to obtain a catalyst.

[0024] The refined methanol from the top of the methanol rectification tower enters the dimethyl ether synthesis tower from the top of the dimethyl ether synthesis tower, and under the action of the catalyst, the reaction of methanol dehydration to dimethyl ether occurs. At 300℃, 0.9h -1 , 0.8MPa reaction conditions, methanol conversion rate reached 72.08 (mol.%).

[0...

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PUM

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Abstract

The invention relates to a catalyst to produce the dimethyl ether with the weight proportion Gamma-Al2O3 sixty to eighty wt percent, ThO2 one to fifteen wt percent, Ga2O3 one to fifteen wt percent, ZrO2 one to fifteen wt percent and bond ten to twenty five wt percent. The raw material is crushed to two hundred meshes and mixes the material by the weight proportion, and then agitates, mold, dry and bake to obtain the catalyst. The invention has the advantages of quick and simple preparation, gentle operating condition, and good reaction performance without pollution.

Description

technical field [0001] The invention relates to a catalyst for producing dimethyl ether, a preparation method and application, in particular to a catalyst for producing dimethyl ether by methanol dehydration, a preparation method and application. Background technique [0002] Coal is the main energy source in our country, and its proportion in the primary energy consumption is more than 70%, but the energy utilization rate is low and the pollution is serious. With the improvement of people's living standards, the demand for clean energy is becoming more and more urgent. Although city gas and natural gas have entered millions of households, there are still many areas where these clean fuels cannot be used. Based on this purpose, it is necessary to seek new clean energy and make it enter areas that cannot be covered by city gas and natural gas. Liquefied petroleum gas (LPG) can replace part of city gas and natural gas to enter households, but the supply of liquefied petroleu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J23/08C07C41/09C07C43/04
Inventor 谭猗生解红娟韩怡卓潘俊轩赵霞
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI