Technique for synthesizing methanol by hydrogen and carbon dioxide

A technology for carbon dioxide and methanol synthesis, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve the problems of high energy consumption, impurity components, and high temperature changes, and achieves low energy consumption and reaction temperature. Low, simple process effect

Active Publication Date: 2009-03-18
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Description
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Problems solved by technology

[0005] At present, domestic and foreign studies have used iron-based catalysts to convert carbon dioxide into carbon monoxide to

Method used

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  • Technique for synthesizing methanol by hydrogen and carbon dioxide

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Embodiment 1

[0029] The processing method of present embodiment hydrogen and carbon dioxide synthesis methanol comprises following major steps:

[0030] (1), the first step of catalytic reaction: hydrogen and carbon dioxide with a volume ratio of 3:1 in 16000h -1 The space velocity is passed into the first reactor, and under the action of a copper-based hydrogenation catalyst with a Cu:Zn:Al molar ratio of 63:25:12, at a temperature of 230°C and a pressure of 8.5Mpa, the first step of catalytic hydrogenation is carried out Reaction to obtain methanol, water, carbon monoxide;

[0031] In this step, 5.9% of the carbon dioxide is converted into carbon monoxide and water, and 16.3% of the carbon dioxide is converted into methanol and water;

[0032] (2), gas-liquid separation: methanol, water, carbon monoxide and unreacted hydrogen and carbon dioxide after the above-mentioned (1) step reaction are carried out gas-liquid separation, methanol and water in the liquid state are separated as produ...

Embodiment 2

[0036] The processing method of present embodiment hydrogen and carbon dioxide synthesis methanol comprises following major steps:

[0037] (1), the first step of catalytic reaction: hydrogen and carbon dioxide with a volume ratio of 3:1 in 10000h -1 The space velocity is passed into the first reactor, and under the action of a copper-based hydrogenation catalyst with a Cu:Zn:Al molar ratio of 65:23:12, at a temperature of 250°C and a pressure of 5.5Mpa, the first step of catalytic hydrogenation is carried out Reaction to obtain methanol, water, carbon monoxide;

[0038] In this step, 8.6% of carbon dioxide is converted into carbon monoxide and water, and 16.6% of carbon dioxide is converted into methanol and water;

[0039] (2), gas-liquid separation: Carry out gas-liquid separation of methanol, water, carbon monoxide and unreacted hydrogen and carbon dioxide after the above-mentioned (1) step reaction, and methanol and water in liquid state are separated as product solution...

Embodiment 3

[0043] The processing method of present embodiment hydrogen and carbon dioxide synthesis methanol comprises following major steps:

[0044] (1), the first step of catalytic reaction: hydrogen and carbon dioxide with a volume ratio of 3:1 in 5000h -1 The space velocity is passed into the first reactor, and under the action of the copper-based hydrogenation catalyst under the action of the copper-based hydrogenation catalyst with a Cu: Zn: Al molar ratio of 70: 18: 12, the temperature is 280 ° C and the pressure is 8.0 Mpa. Carry out the first step of catalytic hydrogenation reaction to obtain methanol, water and carbon monoxide;

[0045] In this step, 13.0% of the carbon dioxide is converted into carbon monoxide and water, and 21.5% of the carbon dioxide is converted into methanol and water;

[0046] (2), gas-liquid separation: methanol, water, carbon monoxide and unreacted hydrogen and carbon dioxide after the above-mentioned (1) step reaction are carried out gas-liquid separat...

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Abstract

The invention discloses a technological method for synthesizing methanol by using hydrogen and carbon dioxide. The method mainly comprises the following steps that the hydrogen and the carbon dioxide are subjected to catalytic reaction which is the first step in a first reactor under the action of copper-based hydrogenation catalyst, so as to obtain methanol, water and carbon monoxide; separation is performed in a gas-liquid separator; liquid methanol and water are separated out; gaseous carbon monoxide, hydrogen and carbon dioxide enter a second reactor; and under the action of a methanol synthesis catalyst, synthesis reaction which is the second step is carried out, so as to obtain crude methanol and water. The method has the advantages that the method uses the hydrogen and the carbon dioxide as raw materials to synthesize the methanol, can fully utilize carbon dioxide resource which is generally regarded as waste gas to be discharged to synthesize the methanol easily, is low in reaction temperature, high in carbon dioxide conversion rate, simple in technological process, low in energy consumption and easy to realize industrialization, and develops a new way to produce methanol raw materials while reducing carbon dioxide emission into atmosphere.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of carbon dioxide, in particular to a process method for directly synthesizing methanol from hydrogen and carbon dioxide. Background technique [0002] Human consumption of oil and coal resources is increasing day by day, the carbon dioxide emitted into the atmosphere continues to grow every year, and the concentration of carbon dioxide in the atmosphere is increasing year by year, which is the main reason for the global greenhouse effect. [0003] Starting from the two basic points of effective protection of the earth's environment and full utilization of carbon resources, the hydrogenation of carbon dioxide to produce methanol can not only solve the problem of utilization of carbon dioxide waste gas, but also reduce the emission of carbon dioxide to the atmosphere, and develop and produce methanol raw materials A new way to more fully and effectively utilize limited carbon reso...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/151C07C29/154
CPCY02A50/20
Inventor 张晓阳凌华招胡志彪邱传珪刘京林李倩黄宏胡高荣刘婷
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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