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Catalyst used for preparing dimethyl ether directly from synthetic gas

A technology of dimethyl ether and synthesis gas, which is applied in the dehydration of hydroxyl-containing compounds to prepare ether, physical/chemical process catalysts, ether preparation, etc., which can solve the problems of high reaction temperature and low selectivity of carbon monoxide conversion to dimethyl ether

Active Publication Date: 2007-05-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is the problems of high reaction temperature, carbon monoxide conversion rate and / or low selectivity of dimethyl ether in bifunctional catalysts in the prior art, and a new method for the direct preparation of dimethyl ether from synthesis gas is provided. catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Use hydrated alumina (aluminum hydroxide) to bake at 550°C for 4 hours to obtain γ-Al 2 o 3 , Dissolve 10 grams of ammonium sulfate with distilled water to form 40 ml of ammonium sulfate aqueous solution, and then pour 20 grams of the above-mentioned γ-Al into it 2 o 3 After soaking for 2 hours, the residual liquid was filtered off, dried overnight at 110°C and then roasted at 550°C for 3 hours to obtain modified γ-Al 2 o 3 . Modified γ-Al 2 o 3 It is an acidic component, which is mechanically mixed with methanol synthesis components, pressed into tablets, crushed and sieved to obtain bifunctional catalyst A, wherein the weight percentage of each component is CuO 45%, ZnO 20%, al 2 o 3 32%, SO 4 2- 3%.

Embodiment 2

[0036] 3.3 grams of analytically pure sulfuric acid are diluted with distilled water into 40 milliliters of sulfuric acid aqueous solution, then pour into it the gamma-Al in 20 grams of above-mentioned embodiment 1 2 o 3 After soaking for 2 hours, the residual liquid was filtered off, dried overnight at 110°C and then roasted at 500°C for 3 hours to obtain modified γ-Al 2 o 3 . The modified γ-Al 2 o 3 It is an acidic component, mechanically mixed with 10 grams of methanol synthesis components, pressed into tablets, crushed and sieved to obtain bifunctional catalyst B, wherein the weight percentage of each component is CuO 40%, ZnO 25 %, Al 2 o 3 30%, SO 4 2- 5%.

Embodiment 3

[0038] 8.6 grams of ammonium persulfate are dissolved with distilled water to be made into 40 milliliters of ammonium persulfate aqueous solution, then pour into it the gamma-Al in the above-mentioned embodiment 1 of 20 grams 2 o 3 After soaking for 2 hours, the residual liquid was filtered off, dried overnight at 110°C and then roasted at 600°C for 3 hours to obtain modified γ-Al 2 o 3 . The modified γ-Al 2 o 3 It is an acidic component, mechanically mixed with 10 grams of methanol synthesis components, pressed into tablets, crushed and sieved to obtain bifunctional catalyst C, wherein the weight percentage of each component is CuO 35%, ZnO 15% %, Al 2 o 3 46%, SO 4 2- 4%.

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Abstract

A catalyst for preparing dimether directly from synthetic gas is prepared from the SO2 ions modified gamma-Al2O3 and Cu(or Zn)-based methanol through compounding to obtain said bifunctional catalyst. Its advantages are high selectivity, high conversion rate and low reaction temp.

Description

technical field [0001] The invention relates to a catalyst for directly preparing dimethyl ether from synthesis gas. Background technique [0002] Dimethyl ether is an important raw material for the production of various chemical products. In the 1980s, many countries in the world developed dimethyl ether as a safe atomization propellant. Freon was banned in the early 1990s, and dimethyl ether was used as an ideal substitute. In recent years, it has been found that it also has extremely good combustion performance and can achieve clean combustion. It is known as "the fuel of the 21st century" abroad, so DME has attracted increasing attention internationally. [0003] Dimethyl ether was first produced by distillation of by-products in high-pressure methanol production. With the wide application of low-pressure methanol synthesis technology, side reactions are greatly reduced, leading to the rapid development of industrial production technology of dimethyl ether to methanol ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/055B01J23/72B01J23/06B01J21/04C07C41/09C07C43/04
Inventor 毛东森宋庆英张斌杨为民陈庆龄
Owner CHINA PETROLEUM & CHEM CORP
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