Effect of amine solution concentration on CO2 absorption
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I keep the concentration of the lean amine solution at around 23%. Currently, the CO2 content in the acidic gas being cleaned is relatively high, at about 30%. Could it be that this concentration affects the selectivity of the lean amine solution, thereby increasing its ability to absorb CO2? Those with relevant experience can share; the main goal is to reduce the absorption of CO2 by lean amine solutions
Under normal circumstances, solvents absorb carbon dioxide and hydrogen sulfide together; therefore, unless it is a special solvent that absorbs hydrogen sulfide to a greater extent, or in preference to the other gas. Also, excessive absorption of carbon dioxide will definitely affect the absorption of hydrogen sulfide; solvents also have a concept of saturation!
Temperature and time have a significant impact on CO2 absorption. If you want to reduce CO2 absorption: 1, the temperature of the amine solution entering the absorption tower can be reduced appropriately; 2, the number of feed inlets in the absorption tower can be decreased (if there are multiple inlets for the amine solution, use the one located at the lower part). Adjust gradually through trial and error.