The aim of this study was to investigate the absorption of carbon dioxide into activated solution. The process may be utilization for purification of gases resulted from combustion of combustible. The accuracy of the mathematical model of the carbon dioxide absorption into potassium carbonate aqueous solution has been evaluated by comparison of the measured and computed values of CO2 molar fraction in the treated gas. Mathematical model used for simulation was a system of six equations, which described variation of composition for liquid and gas phases. The deviations were not greater than 0.76% for H2 O and 4.0% for CO2 molar fraction in the purified gas. The model experimentally tested has been applied for the simulation of the column equipped with the Pall metallic rings packing. The results show superior performances in the same operating conditions.