Kinetics of CO2 desorption from aqueous N-methyldiethanolamine solutions

The CO2 desorption rate from CO2-loaded aqueous N-methyldiethanolamine solutions was measured using a stirred cell with a flat gas–liquid interface. The measurements were performed in the temperature range of 293.15–333.15 K and amine concentration range of 10–30 wt.% MDEA. Measurements were based on a semibatch isothermal absorption of the gas until the equilibrium state was reached, followed by the desorption, which was initiated by the pressure release in the system. A model of mass-transfer with complex chemical reactions based on the film theory was developed to interpret the experimental results. The model takes into account all reversible chemical reactions occurring in the system. The necessary physiochemical properties were taken from literature. The model predictions have found to be in good agreement with the experimental values of CO2 desorption rates from CO2 loaded aqueous MDEA solutions.