Preparation method of dimethyl ether

A technology of dimethyl ether and plasma, applied in ether preparation, dehydration of hydroxyl-containing compounds to prepare ether, organic chemistry, etc., can solve the problems of low selectivity and low conversion rate of dimethyl ether, and achieve high carbon dioxide utilization rate, The effect of fast reaction rate and high yield

Active Publication Date: 2015-03-04
GUANGXI UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome CO in the prior art 2 The conversion rate of dimethyl ether is too low, the shortcoming of the selectivity of dimethyl ether is not high, provide a kind of preparation method of dimethyl ether, this method has simple process, easy to operate, CO 2 The advantages of high conversion rate and high selectivity of dimethyl ether

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  • Preparation method of dimethyl ether
  • Preparation method of dimethyl ether

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Embodiment 1

[0024] A kind of preparation method of dimethyl ether

[0025] Spread a layer of 0.5cm thick quartz sand on the plate electrode of the plasma-catalytic reactor, weigh 1g composite catalyst (Cu-Zn-Cr / γ-Al 2 o 3 ) on the quartz sand, and then spread a layer of quartz sand on the composite catalyst, so that the quartz sand-composite catalyst-quartz sand layer reaches 2cm. The flow rate is 30mL·min -1 H 2 , in situ reduction at 300°C for 4h, after the catalyst is reduced and activated, switch to V(H 2 ) / V(CO 2 ) is a reaction raw material gas of 3, the raw material gas flows through a plasma-catalytic reactor with a discharge distance of 8cm, a discharge voltage of 8kV, and a discharge frequency of 8kHz. The reaction pressure is 2.5MPa, the reaction temperature is 280°C, and the reaction space velocity for 2000h -1 The carbon dioxide hydrogenation reaction is carried out under the same conditions, the main product of the reaction is dimethyl ether, and the by-products are ca...

Embodiment 2

[0027] A kind of preparation method of dimethyl ether

[0028] Spread one deck of 0.5cm thick quartz sand on the plate electrode of the plasma-catalytic reactor, take by weighing 1g composite catalyst (Cu-Zn / HZSM-5, the silicon-aluminum ratio of HZSM-5 is 25) and be placed on the quartz sand, Then spread a layer of quartz sand on the composite catalyst, so that the layer of quartz sand-composite catalyst-quartz sand reaches 2cm. The flow rate is 30mL·min -1 H 2 , in situ reduction at 300°C for 4h, after the catalyst is reduced and activated, switch to V(H 2 ) / V(CO 2 ) is the reaction raw material gas of 2, and the raw material gas flows through a plasma-catalytic reactor whose discharge distance is 3cm, discharge voltage is 4kV, and discharge frequency is 8kHz. The reaction pressure is 5MPa, the reaction temperature is 270°C, and the reaction space velocity is 4000h -1 The carbon dioxide hydrogenation reaction is carried out under the same conditions, the main product of ...

Embodiment 3

[0030] A kind of preparation method of dimethyl ether

[0031]Spread a layer of 0.5cm thick quartz sand on the plate electrode of the plasma-catalytic reactor, weigh 1g composite catalyst (Cu-Zn-Al / HZSM-5, the silicon-aluminum ratio of HZSM-5 is 600) and put it on the quartz sand On the sand, lay a layer of quartz sand on the composite catalyst, so that the quartz sand-composite catalyst-quartz sand layer reaches 2cm. The flow rate is 30mL·min -1 H 2 , in situ reduction at 300°C for 4h, after the catalyst is reduced and activated, switch to V(H 2 ) / V(CO 2 ) is the reaction raw material gas of 5, the raw material gas flows through a plasma-catalytic reactor with a discharge distance of 6cm, a discharge voltage of 12kV, and a discharge frequency of 7kHz. The reaction pressure is 3.5MPa, the reaction temperature is 260°C, and the reaction space velocity 3000h -1 The carbon dioxide hydrogenation reaction is carried out under the same conditions, the main product of the reacti...

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Abstract

The invention discloses a preparation method of dimethyl ether. The preparation method comprises the following steps: mixing CO2 serving as raw material with H2, wherein the ratio of V(H2)/V(CO2) is 2-7; enabling the mixture to pass through a plasma-catalytic reactor of which the discharge spacing is 3-8cm, the voltage is 4-16kV and the frequency is 1-12kHz, wherein the plasma-catalytic reactor combines a plasma generating region and a catalyst storage region together and has a temperature control function; carrying out carbon dioxide hydrogenation reaction under the conditions that the reaction pressure is 1-5MPa, the reaction temperature is 200-280 DEG C and the reaction airspeed is 1000-5000h<-1>, wherein the main reaction product is dimethyl ether and the byproducts are carbon monoxide, methane, methyl alcohol and the like. The preparation method of dimethyl ether has the advantages of simple process, operation convenience, high reaction rate, high CO2 percent conversion and environment-friendly reaction process; the selectivity of dimethyl ether is high and the yield of dimethyl ether is high.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of carbon dioxide. Specifically, it is a preparation method of dimethyl ether. Background technique [0002] With the rapid development of modern industry, CO 2 The rapid increase in emissions has far exceeded the capacity of nature, CO 2 The excessive discharge of carbon dioxide has become a serious environmental problem. Dimethyl ether is an important chemical raw material. It has many unique uses in the chemical industry. It can replace freon as an aerosol propellant and refrigerant to reduce environmental pollution. At the same time, dimethyl ether can replace common The liquefied petroleum gas used is used as domestic fuel, and can also be used as vehicle fuel instead of diesel. CO 2 Catalytic hydrogenation to synthesize dimethyl ether can not only effectively utilize CO 2 Preparation of high value-added chemicals, and can solve CO 2 The problem of environmental pollution is of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/09
CPCC07C41/09C07C43/043
Inventor 秦祖赠周新辉蒋月秀苏通明李立硕
Owner GUANGXI UNIV
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