The kinetics of the reaction of CO2 with secondary an alkanolamine linked with alkyl group, methylaminoethanol (MAE), ethylaminoethanol (EAE) and n-butylaminoethanol (BAE), for CO2 recovery from power plant flue gases was investigated using a stirred tank absorber with a plane unbroken gas-liquid interface at 298 K. To evaluate the reaction rate constant from the CO2 absorption rate data under the fast-reaction regime, a combined parameter containing the solubility and diffusivity for N2O in aqueous solutions of sterically hindered amines; MAE, EAE and BAE, was measured using a wetter-wall column apparatus at the same temperature. For further practical evaluation of the reaction rate, apparent rate constants for EAE under the process condition of CO2 removal from power plants were investigated.