A packed column was used for investigating the desorption rate of CO2 from aqueousmethyldiethanolamine (MDEA) and activated MDEA solutions. Experiments were conducted within the temperature range 30-70 degrees C, the concentration of MDEA was 4.28 kmol/m(3), and the concentration of piperazine (PZ) was 0.10 kmol/m(3) for aqueous activated MDEA solutions. Experimental data confirmed that the kinetics model of absorption CO2 into aqueous MDEA and activated MDEA solutions can be applicable to the situations in which desorption occurs, and the desorption rate of model predictions agree well with that of experimental determination.