I humbly ask about the issues with the second column in low-temperature methanol washing
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Why is the CO2 separation column in the second column of the low-temperature methanol wash process required to separate carbon dioxide at low temperatures?
This understanding... but the two towers flash off carbon dioxide. The lower the temperature of methanol, the better its ability to absorb carbon dioxide; then why is low-temperature flashing used in the second set?
Carbon dioxide is flashed off while ensuring that hydrogen sulfide does not decompose.
The absorption of methanol itself occurs at low temperatures; do you need to heat the methanol to room temperature for desorption, and then cool it down to low temperatures for absorption? I’m bored
Low-temperature flash evaporation of CO2 allows for a lower temperature of the CO2, facilitating the recovery and reuse of cooling energy. It prevents hydrogen sulfide and methanol from flashing out in large quantities, ensuring the quality of the CO2 product
It is true that the lower the temperature, the better the absorption of CO2, but the temperature is too low. The corresponding pressure is also low. The solubility of CO2 decreases accordingly
Flash evaporation is used to recover hydrogen; the two towers produce carbon dioxide while also recovering cooling capacity
The understanding is reversed; it should be that 1. The decomposition of CO2 at low pressure generates cold energy. 2. Cooling before CO2 desorption is done to minimize the amount of H2S that desorbs along with CO2; it also serves to store cold energy in the system.
It is the low temperature resulting from the decomposition of CO2
Generates cooling effect to prevent the release of hydrogen sulfide