Technique for recycling purge gas of device used for synthesizing methyl alcohol by utilizing synthesis gas

A technology for synthesizing methanol and a process method, which is applied in the field of recovery of purge gas of a synthesis gas-to-methanol plant to achieve the effects of improving purity and total volume, reducing emissions and reducing total consumption

Active Publication Date: 2013-08-28
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purge gas of synthetic methanol is a relatively clean gas containing hydrogen, carbon monoxide, and carbon dioxide. Direct combustion or discharge results in the waste of non-renewable coal resources and the increase of methanol production costs. In addition, the existing membrane separation or pressure swing adsorption separation Technology Due to the high content of carbon monoxide, methane and other gases in the purge gas, the recovery rate of hydrogen directly through membrane separation or pressure swing adsorption device is not high, generally lower than 80%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The raw material purge gas adopts the gas composition in Comparative Example 1. In terms of molar ratio, the catalyst of Cu:Zn:Al=7:1:0.8 is used as the catalyst for the carbon monoxide water vapor shift, and the reaction temperature is controlled at 200°C and the pressure is 5.0 MPa, the reaction space velocity is 10000h -1 , adding water vapor 30Kmol / h, the molar ratio of carbon monoxide and water in the purge gas is 1:1.93, the molar ratio of methanol and water in the purge gas is 1:10.1, and the composition of the shifted gas after cooling is CO 0.31%; CO 2 3.50%; H 2 83.08%; N 2 8.67%; Ar 3.51%; CH 4 0.32%; CH 3 OH 0.05%;H 2 O0.02%, after purification by pressure swing adsorption, 99.99% H 2 8450Nm 3 / h, hydrogen production increased by 12.29%, an increase of 925Nm per hour 3 Hydrogen, while the purity of hydrogen has been improved.

Embodiment 2

[0033] The raw material purge gas adopts the gas composition in Comparative Example 2, adopts a carbon monoxide vapor shift catalyst of Cu:Zn:Al=6:3:1 (molar ratio), the reaction temperature is 230°C, the pressure is 4.0MPa, and the reaction space velocity is 8000h -1 , add water vapor 90Kmol / h, the molar ratio of carbon monoxide and water in the purge gas is 1:1.18, the molar ratio of methanol and water in the purge gas is 1:34.2, and the composition of the shifted gas after cooling is CO 1.39%; CO 2 18.91%; H 2 71.77%; N 2 6.91%; Ar 0.48%; CH 4 0.48%; CH 3 Oh 0.04%; H 2 O0.02%, after purification by pressure swing adsorption, 99.99 H 2 8095Nm 3 / h, hydrogen production increased by 31.16%, an increase of 1923 Nm per hour 3 Hydrogen, while the purity of hydrogen has been improved.

Embodiment 3

[0037] The raw material purge gas adopts the gas composition in Comparative Example 3, adopts the carbon monoxide steam shift catalyst of Cu:Zn:Al=7.5:1.5:1 (molar ratio), the reaction temperature is 260°C, the pressure is 4.0MPa, and the reaction space velocity is 10000h -1 , add water vapor 130Kmol / h, the molar ratio of carbon monoxide and water in the purge gas is 1:2.98, the molar ratio of methanol and water in the purge gas is 1:49.38, and the composition of the shifted gas after cooling is CO 0.42%; CO 2 19.38%; H 2 69.23%; N 2 7.06%; Ar 2.27%; CH 4 1.12%; CH 3 OH 0.01%;H 2 O0.52%, after purification by pressure swing adsorption, 99.99 H 2 7360Nm 3 / h, hydrogen production increased by 21.61%, an increase of 1308 Nm per hour 3 Hydrogen, while the purity of hydrogen has been improved.

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Abstract

The invention relates to a technique for synthesizing methyl alcohol by utilizing synthesis gas in the field of chemical industry and in particular relates to a technique for recycling purge gas of device used for synthesizing methyl alcohol by utilizing synthesis gas. The technique comprises the following steps of: carrying out a water vapour transformation reaction on the purge gas of the methyl alcohol synthesizing device, wherein carbon oxide in the purge gas is converted into carbon dioxide and hydrogen, and methyl alcohol in the purge gas is reformed and decomposed into carbon dioxide and hydrogen; carrying out pressure swing adsorption separation purification on the purge gas after the transformation reaction, so as to obtain hydrogen with higher purity; and returning the hydrogen after pressure swing adsorption purification to a methyl alcohol synthesis process, so as to achieve higher feed gas utilization rate. According to the technique for recycling the purge gas of the device used for synthesizing methyl alcohol by utilizing the synthesis gas, content of hydrogen in the purge gas is increased, and discharge of carbon monoxide effective gas is also reduced; direct discharge of methyl alcohol is eliminated, and recycling of the methyl alcohol in the purge gas is realized; and the total consumption of the synthesis gas in methyl alcohol synthesis front processes such as low temperature transformation reaction and pressure swing adsorption decarbonisation is reduced, and direct discharge of carbon dioxide and methyl alcohol synthesis cost are reduced.

Description

Technical field [0001] The present invention involves the process method of synthetic gas synthetic methanol in the chemical field, which is a process method for the recovery of gas recycling for synthetic gas synthetic methanol devices. [0002] Background technique [0003] my country's coal chemical industry is a high energy -consuming and high -emission industry. Due to technology constraints, the energy conversion efficiency of coal in the overall industrial chain is not high, and the strength of energy consumption and carbon dioxide emissions is more than 10 times the national analogy of the country. The disorderly development will directly affect the realization of the overall goal of national energy conservation and emission reduction.Therefore, the annual output of 1 million tons and below coal methanol projects and other coal chemical projects have been strictly restricted by national industrial policies.Under this industrial policy, millions of tons of large coal -to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50
Inventor 张晓阳胡志彪胡高荣邹鑫徐晓峰李倩黄宏邱传珪
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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