The mass transfer performance of the absorption of CO2 in an aqueous solution of a new amino alcohol, 4-diethylamino-2-butanol (DEAB), which has been developed as an effective postcombustion CO2 capture solvent, was investigated and compared with the performance Of CO2 absorption in a conventional amine, MEA. The absorption experiments were conducted in an absorption column containing structured packing, whereas the absorption performance was evaluated in terms of the overall mass transfer coefficient, K(G)a(v). In particular, the effects of parameters Such as inert gas flow rate, liquid flow rate, and solution concentration were compared for both DEAB and MEA. The results show that K(G)a(v) increases as both the liquid flow rate and concentration of solution increase whereas inert gas flow rate has little or no effect oil K(G)a(v). An empirical correlation for the mass transfer coefficient for the CO2-DEAB system has been developed as a function of the process parameters. In terms of comparison, the results show that the mass transfer performance of MEA was greater than that of DEAB. However, with the extremely high solubility and ease of regeneration of DEAB based oil Our previous Study, it may be extremely beneficial to formulate an absorption solvent involving both MEA and DEAB in order to take advantage of the synergy effects of high solubility, ease of regeneration as well as the high mass transfer performance of the mixture.