“The principle of \"reducing both energy consumption and water usage in the synthesis of methanol using low-carbon technologies\"
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The news article “Low-carbon technologies reduce energy and water consumption in methanol synthesis” at http://www.cpcia.org.cn/html/news/20109/79474_703.shtml mentions that the production of methanol using natural gas or petroleum refining off-gases as raw materials results in significant waste of hydrogen, as the ratio of H2+CO to CO+CO2 in the syngas is as high as 2.92. On the other hand, the production of methanol from coal through gasification results in a ratio of H2+CO/CO+CO2 in the syngas of only 1, which is far below the optimal ratio of 2.05–2.15 for methanol synthesis; as a result, the coal-based methanol production process generates large amounts of carbon dioxide while consuming large quantities of coal to obtain sufficient hydrogen. ”How should this passage be understood?
Methanol can be produced by combining coal and oil field gas; any entity that possesses such resources can undertake this process. Water conservation, however, is worth paying attention to.
“Producing methanol using natural gas or dry gas from petroleum refining as raw materials results in significant waste of hydrogen, as the ratio of H2+CO to CO+CO2 in the syngas is as high as 2.92. "It means that the hydrogen-to-carbon ratio in the syngas is high, resulting in more hydrogen in the off-gases. On the other hand, when methanol is produced by gasification of coal, the ratio of H2+CO to CO+CO2 in the syngas is only 1, which is much lower than the optimal ratio of 2.05–2.15 for methanol production; as a result, the coal-based methanol production process generates large amounts of carbon dioxide while consuming large quantities of coal to obtain sufficient hydrogen. ”It means that the hydrogen-to-carbon ratio in syngas is low; a conversion process is required during gas production. To obtain hydrogen, carbon monoxide is needed for the reaction CO+H2O=CO2+H2, and as a result, large amounts of carbon dioxide are emitted.
Reply to 3# yxdgx: “There is a high amount of hydrogen in the vent gas.” In that case, the nitrogen content can be increased slightly, and as a result, the hydrogen content in the vent gas will decrease.
Upstairs, I understood that \"the nitrogen content can be increased slightly, and as a result the hydrogen content in the off-gases will decrease.\" By off-gases, I mean gases that contain a high amount of hydrogen; I’m not talking about ways to reduce the hydrogen content in those off-gases. Even if 30% of the gas in your tank is an inert gas, the hydrogen content is still over 50%. What is meant here is that hydrogen accounts for a large proportion in the gas composition