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Acid gases absorption/desorption by alkanolamines aqueous solutions

Renaud Cadours
Abstract : A constant interfacial area gas-liquid reactor was designed to measure CO2 desorption rates from alkanolamines aqueous solutions. Experiments were achieved in an extended range of temperatures, 40°C - 110°C, with CO2 loadings in the range 0.05 - 0.85 molCO2/molamines, and with 25 and 50 wt % MDEA aqueous solutions, 45-5 and 30-20 wt % MDEA-DEA aqueous blends. An analytical method using thermodynamic and kinetic approximations represents the CO2 desorption rates from MDEA aqueous solutions, with loadings lower than 0.50 molCO2/molMDEA. It has been shown that it is necessary to use a general mass transfer model taking into account chemical reactions, coupled to a thermodynamic model representing CO2-H2O-Amines physical and chemical equilibria. A numerical tool was developed to represent the mass transfer phenomenon with chemical reactions. The liquid phase concentration profiles and flux rates for transferred species at the gas-liquid interface are obtained from the resolution of the material balance equations for each species. This kinetic model, combined with appropriate parameters, was successfully applied to the CO2 absorption into MDEA aqueous solutions, MDEA-MEA and MDEA-DEA aqueous blends. By coupling consistent kinetic and thermodynamic parameters, this tool gives a good representation of the desorption rates measured in the constant interfacial reactor.
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Renaud Cadours. Acid gases absorption/desorption by alkanolamines aqueous solutions. Engineering Sciences [physics]. École Nationale Supérieure des Mines de Paris, 1998. English. ⟨pastel-00005592⟩

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