Methanol Purification Version – Daily Question 20200307
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What is the impact of a small amount of CO2 in the feed gas used for methanol synthesis on the production of methanol? Answer: Positive effects: (1) CO2 itself can also participate in the synthesis reaction, and its presence inhibits the formation of dimethyl ether to a certain extent. (2) It prevents CO from being converted into CO2, a reaction that occurs in the presence of H2O. (3) It helps to regulate temperature, prevent overheating, protect the activity of copper-based catalysts, and extend their service life. (4) It can prevent carbon deposition on the catalyst. Disadvantages: (1) Compared to methanol synthesis from CO, 0.7 m3 more H2 is required per 1 kg of methanol produced. (2) An increase in water content in crude methanol and a decrease in methanol concentration lead to higher steam consumption.
(1) From the reaction equation, CO2 can also participate in the reaction to produce methanol. The synthesis of methanol from CO2 requires one more molecule of H2 compared to using CO, and one molecule of H2O is produced as a byproduct. Therefore, when the hydrogen content in the feed gas is low, it is necessary to use more H2 and CO to produce methanol. (2) The presence of CO2 inhibits the formation of dimethyl ether to a certain extent. Since dimethyl ether is the product of the dehydration reaction of 2 molecules of methanol, the reaction between CO2 and H2 to produce methanol generates 1 molecule of H2O, and the presence of H2O plays a positive role in suppressing the dehydration reaction of methanol. (3) It prevents CO from being converted into CO2, a reaction that occurs in the presence of H2O. (4) It is more effective at regulating temperature, preventing overheating, protecting the activity of copper-based catalysts, and extending their service life. (5) It can prevent carbon deposition on the catalyst. Therefore, the CO2 content in the feed gas is generally kept at around 3%.
(1) From the reaction equation, CO2 can also participate in the reaction to produce methanol. The synthesis of methanol from CO2 requires one more molecule of H2 compared to using CO, and one molecule of H2O is produced as a byproduct. Therefore, when the hydrogen content in the feed gas is low, it is necessary to use more H2 and CO to produce methanol. (2) The presence of CO2 inhibits the formation of dimethyl ether to a certain extent. Since dimethyl ether is the product of the dehydration reaction of 2 molecules of methanol, the reaction between CO2 and H2 to produce methanol generates 1 molecule of H2O, and the presence of H2O plays a positive role in suppressing the dehydration reaction of methanol. (3) It prevents CO from being converted into CO2, a reaction that occurs in the presence of H2O. (4) It is more effective at regulating temperature, preventing overheating, protecting the activity of copper-based catalysts, and extending their service life. (5) It can prevent carbon deposition on the catalyst. Therefore, the CO2 content in the feed gas is generally kept at around 3%.
Positive effects: (1) CO2 itself can also participate in the synthesis reaction, and its presence inhibits the formation of dimethyl ether to a certain extent. (2) It prevents CO from being converted into CO2, a reaction that occurs in the presence of H2O. (3) It helps to regulate temperature, prevent overheating, protect the activity of copper-based catalysts, and extend their service life. (4) It can prevent carbon deposition on the catalyst. Disadvantages: (1) Compared to methanol synthesis from CO, 0.7 m3 more H2 is required per 1 kg of methanol produced. (2) An increase in water content in crude methanol and a decrease in methanol concentration lead to higher steam consumption.
Positive effects: (1) CO2 itself can also participate in the synthesis reaction, and its presence inhibits the formation of dimethyl ether to a certain extent. (2) It prevents CO from being converted into CO2, a reaction that occurs in the presence of H2O. (3) It helps to regulate temperature, prevent overheating, protect the activity of copper-based catalysts, and extend their service life. (4) It can prevent carbon deposition on the catalyst. Disadvantages: (1) Compared to methanol synthesis from CO, 0.7 m3 more H2 is required per 1 kg of methanol produced. (2) An increase in the water content in crude methanol and a decrease in the methanol concentration lead to higher steam consumption.
Positive effects: (1) CO2 itself can also participate in the synthesis reaction, and its presence inhibits the formation of dimethyl ether to a certain extent. (2) It prevents CO from being converted into CO2, a reaction that occurs in the presence of H2O. (3) It helps to regulate temperature, prevent overheating, protect the activity of copper-based catalysts, and extend their service life. (4) It can prevent carbon deposition on the catalyst. Disadvantages: (1) Compared to methanol synthesis from CO, 0.7 m3 more H2 is required per 1 kg of methanol produced. (2) An increase in the water content in crude methanol and a decrease in the methanol concentration lead to higher steam consumption.
Positive effects: (1) CO2 itself can also participate in the synthesis reaction, and its presence inhibits the formation of dimethyl ether to a certain extent. (2) It prevents CO from being converted into CO2, a reaction that occurs in the presence of H2O. (3) It helps to regulate temperature, prevent overheating, protect the activity of copper-based catalysts, and extend their service life. (4) It can prevent carbon deposition on the catalyst. Disadvantages: (1) Compared to methanol synthesis from CO, 0.7 m3 more of H2 is required per 1 kg of methanol produced. (2) The water content in crude methanol increases, while the methanol concentration decreases.
Positive effects: (1) CO2 itself can also participate in the synthesis reaction, and its presence inhibits the formation of dimethyl ether to a certain extent. (2) It prevents CO from being converted into CO2, a reaction that occurs in the presence of H2O. (3) It helps to regulate temperature, prevent overheating, protect the activity of copper-based catalysts, and extend their service life. (4) It can prevent carbon deposition on the catalyst. ? ?? ? Adverse effects: (1) Compared to methanol synthesis from CO, 0.7 m3 more of H2 is required per 1 kg of methanol produced. (2) An increase in the water content in crude methanol and a decrease in the methanol concentration lead to higher steam consumption.
Positive effects: (1) CO2 itself can also participate in the synthesis reaction, and its presence inhibits the formation of dimethyl ether to a certain extent. (2) It prevents CO from being converted into CO2, a reaction that occurs in the presence of H2O. (3) It helps to regulate temperature, prevent overheating, protect the activity of copper-based catalysts, and extend their service life. (4) It can prevent carbon deposition on the catalyst. Disadvantages: (1) Compared to methanol synthesis from CO, 0.7 m3 more H2 is required per 1 kg of methanol produced. (2) An increase in water content in crude methanol and a decrease in methanol concentration lead to higher steam consumption.
Positive effects: (1) CO2 itself can also participate in the synthesis reaction, and its presence inhibits the formation of dimethyl ether to a certain extent. (2) It prevents CO from being converted into CO2, a reaction that occurs in the presence of H2O. (3) It helps to regulate temperature, prevent overheating, protect the activity of copper-based catalysts, and extend their service life. (4) It can prevent carbon deposition on the catalyst. Disadvantages: (1) Compared to methanol synthesis from CO, 0.7 m3 more of H2 is required per 1 kg of methanol produced. (2) The water content in crude methanol increases, while the methanol concentration decreases.