Technique for synthesizing methanol by hydrogen and carbon dioxide

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...

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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 synthesize methanol, but its obvious disadvantages are high temperature change, high energy consumption, and impurity components.

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