The kinetics of the reaction of CO2 with 6 kinds of chemical absorbents were investigated at 298 K. The experiments were performed in a stirred vessel with a horizontal interface which appeared to be completely smooth. Tested absorbents were 2-amino-2-methyl-1-propanol (AMP), KS-1 absorbent, monoethanolamine (MEA), methylaminoethanol (MAE), methyldiethanolamine (MDEA) and Diethanolamine (DEA). MAE and KS-1 absorbent showed good kinetic characteristics, which were found to be higher than those for conventional MEA absorbent. A simple method for calculating rate constants was also studied. Physical absorption experiments are generally necessary to evaluate reaction rate constants of alkanolamines. In this research, a method for calculation of reaction rate constants has been proposed without these relatively complicated experiments. However, this calculation method can be applied only for amines with molecular weights of 60-120 and liquid concentrations of less than 1.4 kmol.m(-3). The values of the rate constant for MAE and KS-1 absorbents at 298 K were evaluated to be 4.71 X 10(3)m(3).kmol.s(-1) and 7.99 X 10(3)m(3).kmol.s(-1), respectively, which were higher than that of MEA (3.63 X 10(3)m(3).kmol.s(-1)).