The impact of CO2 content levels on the temperature of the methanol column
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The carbon dioxide concentration is around 1 percent, and the gas volume is 80,000. If the carbon dioxide level is too high, it becomes difficult to control the temperature. I hope fellow sailors can help me figure out how to better control the temperature.
What methods do you use to control the temperature of the methanol reactor? If cold side streams or branches are used, it still comes down to adjustment issues. The heat released during the reaction of CO2 and hydrogen to produce methanol is half that released by CO and hydrogen: CO + 2H2 = CH3OH + 90 kJ/mol; CO2 + 3H2 = CH3OH + H2O + 49 kJ/mol. Generally, a CO2 concentration of 3%-5% is optimal for the catalyst and the reaction process. Therefore, it’s necessary to consider whether other parameters or control methods need to be adjusted. Typically, if the CO level remains constant and the CO2 concentration increases, there may be a shortage of hydrogen, and in such cases it’s important to control the amount of inert gases; otherwise, control becomes more difficult
The catalysts we have here are not very effective for CO2 reactions; production must be reduced when the CO2 content exceeds 2%. However, the heat generated by CO2 is pitifully small compared to that of CO. So the temperature is hard to control; it seems experience is required. Thanks to the moderator for the advice~~
In our plant, with methanol catalysts, it is very difficult to control the temperature when the carbon dioxide concentration exceeds 1.1%; this is manifested in large temperature differences, with the temperature dropping in the upper part while it remains above the acceptable level in the lower part. The main reasons for this are the low heat release associated with the reaction of carbon dioxide to form methanol, which leads to a drop in temperature, as well as the impact of the water produced on the copper-based catalysts. For reference only