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Method for synthesising methanol by complete cycle of carbon monoxide, carbon dioxide and hydrogen

A carbon dioxide and carbon monoxide technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve problems such as environmental pollution and waste of resources, and achieve the goal of reducing production costs, reducing temperature rise, and optimizing process technology Effect

Active Publication Date: 2012-06-27
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only pollutes the environment, but also wastes resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The gas composition of raw materials entering the tower in the reaction of synthesizing methanol is: CO8.0%, CO 2 15.13%, H 2 76.87%, the hydrogen-carbon ratio of the raw material entering the tower is 2.67, the reaction temperature is 250°C, the reaction pressure is 8.0MPa, and the reaction space velocity is 10000h -1 , using 200mlCuO / ZnO / Al 2 o 3 Industrial synthesis of methanol catalysts for fixed-bed catalytic reactions. After gas-liquid separation, the tower gas composition is: CO, 3.00%; CO 2 , 17.92%; H 2 , 79.08%, the tower gas volume is 1.60Nm 3 / h. Under the action of the existing industrial methanol synthesis catalyst, the one-way conversion rate of carbon monoxide is 70.00%, the one-way conversion rate of carbon dioxide is 5.19%, and the heat released by the reaction is 676.84kj / h. During the reaction process, the average temperature rise is 5°C, and the unreacted raw materials and gas phase products such as methanol and water take away about 13.25kj / ...

Embodiment 2

[0030] The gas composition of raw materials entering the tower in the reaction of synthesizing methanol is: CO, 6.0%; CO 2 , 20.5%; H 2 , 73.50%. The hydrogen-carbon ratio of the raw material entering the tower is 2.0, the reaction temperature is 240°C, the reaction pressure is 8.5MPa, and the reaction space velocity is 10000h -1 , using 200mlCuO / ZnO / Al 2 o 3 Industrial synthesis of methanol catalysts for fixed-bed catalytic reactions. After gas-liquid separation, the tower gas composition is: CO, 2.51%; CO 2 , 23.11%; H 2 , 74.37%, the tower gas volume is 1.67Nm 3 / h. Under the action of the existing industrial methanol synthesis catalyst, the one-way conversion rate of carbon monoxide is 65.00%, the one-way conversion rate of carbon dioxide is 5.8%, and the heat released by the reaction is 422.38kj / h. The average temperature rise during the reaction is 2°C, and the unreacted raw materials and gas phase products such as methanol and water take away about 8.30kj / h of h...

Embodiment 3

[0032] The gas composition of raw materials entering the tower in the reaction of synthesizing methanol is: CO, 10.0%; CO 2 , 12.90%; H 2 , 77.10%. The hydrogen-carbon ratio of the raw material entering the tower is 2.8, the reaction temperature is 200°C, the reaction pressure is 8.0MPa, and the reaction space velocity is 5000h -1 , using 200mlCuO / ZnO / Al 2 o 3 Industrial synthesis of methanol catalysts for fixed-bed catalytic reactions. After gas-liquid separation, the tower gas composition is: CO, 6.06%; CO 2 , 14.88%; H 2 , 79.06%, the tower gas volume is 0.82Nm 3 / h. Under the action of the existing industrial methanol synthesis catalyst, the one-way conversion rate of carbon monoxide is 50.00%, the one-way conversion rate of carbon dioxide is 4.93%, and the heat released by the reaction is 170.24kj / h. The average temperature rise during the reaction is 2.5°C, and the unreacted raw materials and gas phase products such as methanol and water take away about 3.28kj / h ...

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Abstract

The invention discloses a method for synthesising methanol by the complete cycle of carbon monoxide, carbon dioxide and hydrogen, comprising the following steps of: adjusting the content of carbon dioxide in raw material gases for synthesising methanol to control the intensity of heat release in a reaction for synthesising methanol, so as to achieve the matching of heat released from the synthesis reaction and the heat transfer of a methanol synthesis tower, wherein the concentration in mole percentage of carbon dioxide in the synthesising gases is 10.0-20.5%; performing gas-liquid separation and boosting on the unreacted carbon monoxide, carbon dioxide and hydrogen after catalytic reaction on the raw material gases consisting of carbon monoxide, carbon dioxide and hydrogen, and then returning all the unreacted gases to the inlet of the synthesis tower; and adjusting the ratio of the carbon monoxide to the carbon dioxide to the hydrogen in a fresh gas, and enabling the synthesising gases entering in the synthesis tower to satisfy a hydrogen-carbon ratio of 2.00-2.80. The method disclosed by the invention realizes the complete cycle of carbon monoxide, carbon dioxide and hydrogen, reduces energy and the losses of non-renewable resources, optimizes the process technology for synthesising methanol, and decreases production cost.

Description

technical field [0001] The invention relates to a process for synthesizing methanol from synthesis gas in the field of chemical industry, in particular to a process for synthesizing methanol from synthesis gas with medium and low pressure (excluding inert gas nitrogen) and high carbon dioxide content. Background technique [0002] With the rapid development of the economy and the gradual depletion of oil resources, alternative energy has become one of the focuses of my country's technological and industrial development. Facing the resource conditions and national conditions of "lack of oil, less gas, and relatively rich coal resources" in my country, alcohol ether fuel has become an alternative energy source with great development prospects. [0003] Medium and low pressure methanol synthesis technology is one of the important process technologies in the field of coal chemical industry. In recent years, my country's medium and low pressure synthetic methanol industry has de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/151
CPCY02E50/18Y02E50/10
Inventor 张晓阳胡志彪胡高荣徐晓峰刘岩李倩黄宏邱传珪刘京林
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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