Bench-Scale CO2 Recovery from Moist Flue Gases by Various Alkali Carbonates Supported on Activated Carbon

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As described in the previous papers, K2CO3 supported on activated carbon sorbed CO2 from moist feed gas at 353 K to form KHCO3 and the entrapped CO2 was then efficiently released by steam flushing at 423 K, followed by condensation of the excess steam through a heat exchanger to afford CO2 in high purity. In the present study, various alkali carbonates supported on activated carbon were employed to recover CO2 from moist gases at different temperatures. Carbon dioxide can be sorbed at higher temperatures in the order of the impregnated salt, Na2CO3 < K2CO3 < Rb2CO3 ~ Cs2CO3, indicating the applicability of CO2 sorbents from moist flue gases at temperatures of 313–393 K by selecting the type of alkali carbonate for impregnation. By employing a bench-scale apparatus packed with the sorbent, materials (CO2, water) balance and heat balance during CO2 sorption/release steps were measured in order to elucidate the CO2 recovery performance. The CO2 uptake increased in the order of the impregnated salt, Cs2CO3 ~ K2CO3 < Na2CO3, while heat for the CO2 release per unit mass of recovered CO2 decreased in the order of Na2CO3 > K2CO3 > Cs2CO3, providing a more energy-conservative CO2 recovery process for moist flue gases at 313–393 K than conventional amine absorption methods.

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