Unsteady-state absorption of CO2 into W/O type emulsion was studied by both experimental measurements and prediction from mathematical modeling. Absorption experiments were carried out using a stirred vessel with a flat gas-liquid interface under 0.101 MPa and 25degreesC. Continuous phase was benzene, which has larger solubility than water. Dispersed phase was an aqueous solution of MEA, DEA, TEA, and AMP. The effects of reactant concentration, size of aqueous droplets, volume fraction of continuous phase, and stirring speed on the absorption rate of CO2 were investigated. In the mathematical model, the mechanism of CO2 absorption into the continuous phase through a gas-liquid interface was described on the basis of the penetration model, while the subsequent absorption/reaction in dispersed droplets was modeled on the basis of the film model.