The kinetics of CO 2 absorption by aqueous solutions of methyl diethanol amine (MDEA) were measured in the temperature range (296-343) K and MDEA concentration range (830-4380) mol‚m -3 (10-50 mass %). A thermoregulated constant interfacial area Lewis-type cell was operated by recording the pressure drop during batch absorption. The kinetic results are in agreement with a fast regime of absorption according to film theory. MDEA depletion at the interface has a significant effect on the kinetics at the CO 2 pressures (100 to 200 kPa) studied in this work, especially at low temperatures and low MDEA concentrations. Considering only the reaction between CO 2 and MDEA, the CO 2 absorption appears as a first-order reaction with respect to MDEA. The activation energy found for the reaction between CO 2 and MDEA is 45 kJ‚mol -1 , but this value depends significantly (by about 10% in the worst case) on the vapor-liquid equilibrium data used.

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