Numerical simulation of CO2 absorption into aqueous methyldiethanolamine solutions

The CO₂ absorption rate into 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 to 333.15 K for various amine concentrations and CO₂ partial pressures. A numerical model of mass-transfer with complex chemical reactions based on the film theory was developed to interpret the experimental results. The model predictions have been found to be in good agreement with the experimental values of CO₂ absorption rates. A comparison is made between the enhancement factor predicted from the detailed model and the approximate solution of mass transfer equations with chemical reaction. The numerical results indicate that under the present experimental conditions, the effect of the reaction between CO₂ and OH^? on the observed mass transfer rates is negligible. The detailed mass transfer model was used for simulating the CO₂ absorption process in terms of the enhancement factor under a variety of operating conditions.