Carbon dioxide was absorbed into aqueous solution of sodium glycinate (SG) at different SG concentrations, CO2 partial pressures, and temperatures in the range of 0.5-3.0 kmol/m(3), 25-101.3 kPa, and 298-318 K, respectively, using a stirred semi-batch vessel with a planar gas-liquid interface. Both the reaction order and rate constant are determined from gas absorption rates under the fast reaction regime. The reaction was found to be first order with respect to both CO2 and SG. The activation energy for the CO2-SG reaction has been found to be 59.8 kJ/mol. The second-order reaction rate constants were used to obtain the theoretical values of absorption rate based on the film theory.