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Production and use for dimethyl ether by methanol dewater

A methanol dehydration and catalyst technology, which is applied in the direction of preparation of ether, dehydration of hydroxyl-containing compounds to prepare ether, chemical instruments and methods, etc., can solve the problems of complex preparation process, generation of sulfate waste liquid, unfavorable environment, etc., and achieve simple preparation process, Ease of preparation

Inactive Publication Date: 2006-03-15
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

CN1322704A has reported that methanol is used as raw material, and liquid composite acid is used as dehydration catalyst, and CN1111231A has reported that sulfuric acid is used as catalyst catalytic distillation to prepare dimethyl ether, but these two methods have equipment corrosion problems in different degrees
CN1308987A and CN1368493A have reported that with heteropolyacid, superacid SO 4 2- As a catalyst to dehydrate methanol to generate dimethyl ether, but the preparation process of heteropoly acid catalyst is complicated, and the preparation process of super acid catalyst has the disadvantages of producing sulfate waste liquid, which is unfavorable to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: copper nitrate trihydrate 121.4g, zinc nitrate hexahydrate 18.3g, lanthanum nitrate hexahydrate 13.3g. Dissolve each metal salt in methanol + acetone at a ratio of 1.3ml solvent / g carrier, pour 40g carrier Al 2 o 3 , stir well. Then add 5 g of samarium oxide and 5 g of vanadium pentoxide ground to below 250 mesh, continue to stir evenly, irradiate and dry with infrared light at 60°C, and roast at 350°C. The weight percentages of each component are CuO: 40, ZnO: 5, La 2 o 3 : 5, Sm 2 o 3 : 5, V 2 o 5 : 5, Al 2 o 3 : 40 Catalysts. Tablet, sieve, at 0.3MPa, 280°C, weight space velocity 2.0h -1 Under the above conditions, the molar conversion rate of methanol is 68.5%, and the molar selectivity of dimethyl ether is 95.4%.

Embodiment 2

[0017] Embodiment 2: copper nitrate trihydrate 60.7g, zinc nitrate hexahydrate 109.6g, lanthanum nitrate hexahydrate 2.7g. Dissolve each metal salt in methanol + ethanol + acetone at a ratio of 2ml solvent / g carrier, pour into 47g carrier HZSM-5, and stir evenly. Then add 1 g of samarium oxide and 1 g of vanadium pentoxide ground to below 250 mesh, continue to stir evenly, irradiate and dry with infrared light at 100°C, and roast at 450°C. The weight percentages of each component are CuO: 20, ZnO: 30, La 2 o 3 : 1, Sm 2 o 3 : 1, V 2 o 5 : 1, Al 2 o 3 :47 Catalyst. Tablet, sieve, at 0.5MPa, 240℃, weight space velocity 1.0h -1 Under the above conditions, the molar conversion rate of methanol is 65.5%, and the molar selectivity of dimethyl ether is 90.2%.

Embodiment 3

[0018] Embodiment 3: copper acetate monohydrate 75.2g, zinc nitrate hexahydrate 36.5g, lanthanum nitrate hexahydrate 26.6g. Dissolve each metal salt in ethanol at a ratio of 1.5ml solvent / g carrier, and pour into carrier 20g SiO 2 , 20gHZSM-5, stir evenly. Then add 5 g of samarium oxide and 5 g of vanadium pentoxide ground to below 250 mesh, continue to stir evenly, irradiate and dry with infrared light at 80°C, and roast at 350°C. The weight percentages of each component are CuO: 30, ZnO: 10, La 2 o 3 : 1O, Sm 2 o 3 : 5, V 2 o 5 : 5, SiO 2 :20, the catalyst of HZSM-5:20. Tablet, sieve, at 0.3MPa, 280°C, weight space velocity 3.0h -1 Under the above conditions, the molar conversion rate of methanol is 76.8%, and the molar selectivity of dimethyl ether is 93.2%.

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PUM

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Abstract

A catalyst for preparing dimether by dewatering methanol contains CuO (20-40 Wt%), ZnO (5-30), La2O3 (1-10), Sm2O3 (1-10), V2O5 (1-10) and carrier (40-60). Its preparing process includes such steps as dissolving copper nitrate (or acetate), Zinc nitrate (or acetate) and lanthanum nitrate in solvent, adding carrier, stirring, adding superfine (250 meshes) particles of Sm2O3 and V2O5, stirring, infrared drying at 60-100 Deg C., calcining at 350-500 Deg C., pressing and sieving.

Description

technical field [0001] The invention relates to a catalyst for synthesizing dimethyl ether, in particular to a catalyst for preparing dimethyl ether by dehydrating methanol as a raw material, a preparation method and application thereof. Background technique [0002] Dimethyl ether is an important chemical raw material, and it has a wide range of uses, such as fuel, aerosol, refrigerant and methylation reagent [Hou Zhaoyin, Fei Jinhua, Zheng Xiaoming, Petrochemical, 1999, 28( 1): 59-62]. It can replace chlorofluorocarbons as aerosol propellants to reduce the damage to the ozone layer of the atmosphere. The uniqueness of dimethyl ether also lies in that it has a cetane number similar to that of gasoline and can realize smokeless combustion, so it is recognized as a green fuel in the 21st century [Lu Shiwei, Chemical Physics Communication, 2(7): 6 , 2001]. As an important chemical intermediate and a clean fuel in the 21st century, dimethyl ether has attracted more and more ...

Claims

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Application Information

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IPC IPC(8): B01J23/847C07C41/09C07C43/04
Inventor 谭猗生解红娟韩怡卓崔海涛杨彩虹
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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