A Study of CO2 Gas Adsorption into and Desorption from Methyldiethanolamine Aqueous Solution

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  • メチルジエタノールアミン水溶液のCO2ガスの吸着および放散

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The apparent absorption rate, (S/V)kL*, and the apparent desorption rate,(S/V)kL', of CO2 gas were investigated by blowing CO2 gas and N2 gas into methyldiethanolamine(MDEA)aqueous solution through an upwaτd vertical glass nozzle. Then (S/V)kL* and (S/V)kL' with MDEA aqueous solution were compared with those with monoethanolamine(MEA) aqueous solution. It was found that (S/V)kL* with MDEA and MEA solution were　1.4 times and 3.2 times as high, respectively, as that of physical absorption, and that (S/V)kL' was as high as that of physical desorption. Temperature dependencies of (S/V)kL* and (S/V)kL' with MDEA and MEA aqueous solution were similar to those of mass transfer in liquid film. Futhermore, linear relationships were found between (S/V)kL*, (S/V)kL’ and gas flow rate. Both absorption and desorption processes used these solutions, and it seems that the mass transfer process in liquid film was the rate determining step in these reactions.

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