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The present paper investigates the performance of the KOH aqueous solution as an absorbent to capture carbon dioxide (CO2). The chemical absorption was carried out according to consecutive reactions that are generated in the order of K2CO3 and KHCO3. The overall absorption was completed with following the physical absorption. When the absorption was conducted with the KOH as the limiting reactants in batch a reactor, K2CO3 production rate was the 1st order reaction for OH. However, KHCO3 generation reaction was independent of the CO3 concentration and the rate was calculated to be 0.18 gCO2/min for all KOH absorbents, which is the same value of the reaction rate using K2CO3 aqueous solution as the absorbents. The overall CO2 capture ratio of the 5% KOH absorbent was estimated to be 19% and the individual value in section 1 and 2 was 57 and 12%, respectively. The amount of CO2 absorbed in the solution was very slightly less than the theoretical value, which was ascribed to the side reaction that produces K2CO3・KHCO3・1.5H2O during the reaction and the consequent diminish in CO2 absorption in the KOH solution.

A Study on Carbon Dioxide Capture Performance of KOH Aqueous Solution via Chemical Absorption