Modeling and Experimental Study of Carbon Dioxide Absorption into Aqueous Amine Based Solvents

This work focused on the CO2 capture by absorption into amines based absorbents. Aqueous mixtures containing different types of amines (MEA, MDEA, AMP, PZ and PZEA) are experimentally compared in a special gas-liquid contactor (a cables-bundle contactor) with respect to the CO2 removal performances at 25°C and atmospheric pressure. This absorption process was also simulated with the use of published data on physico-chemical properties (densities, viscosities, diffusivities, Henry coefficients) of the CO2-amines systems. The different experiments clearly highlighted the positive effect of activators such as PZ and PZEA on the absorption performances measured with MEA, MDEA and AMP solutions. Regarding the simulation results, they matched quite satisfactorily the experimental values concerning individual amines solutions, but improvements should be envisaged in order to simulate successfully the CO2 absorption into amines mixtures.