The CO2 reaction rate in aqueous 2-methylpiperazine (2MPZ) solution was investigated in terms of the pseudo-first-order rate constant (k(0)) by using a stopped-flow apparatus with amine concentration ranges of 0.05-0.125 mol/L and the measuring temperature ranges of 293.15-313.15 K. The results show that the CO2 reaction rate in the 2MPZ solution increased as the temperature and the amine concentration increases. The results also demonstrate that the 2MPZ has a faster reaction rate in terms of k(0) than 3dimethylaminopropylamine, 3-diethylaminopropylamine, and monoethanolamine (MEA) but slower than that of PZ at the same amine concentration. The equilibrium solubility as an important absorption parameter for CO2 capture also were measured at 298.15, 313.15, and 333.15 K with CO2 partial pressures of 5-100 kPa, respectively, in 2 M 2MPZ solution. The results show that the CO2 equilibrium solubility of 2MPZ increased as the CO2 partial pressure increased but decreased as the temperature increased. The heat of CO2 absorption in 2 M 2MPZ solution was estimated by using the Gibbs-Helmholtz equation, and the value (-70.9 kJ/mol) is similar to that of PZ but lower than that of MEA. Besides the conclusions stated above, the results of the C-13 NMR quantitative investigation suggest that 2MPZ can produce less carbamate and more bicarbonate than PZ at the same CO2 loading.