(Vapour + liquid) equilibria (VLE) of CO2 in aqueous solutions of 2-amino-2-methyl-1-propanol: New data and modelling using eNRTL-equation

This work presents new experimental results for carbon dioxide (CO2) solubility in aqueous 2-amino-2-methyl-1-propanol (AMP) over the temperature range of (298 to 328) K and CO2 partial pressure of about (0.4 to 1500) kPa. The concentrations of the aqueous AMP lie within the range of (2.2 to 4.9) mol · dm−3. A thermodynamic model based on electrolyte non-random two-liquid (eNRTL) theory has been developed to correlate and predict the (vapour + liquid) equilibrium (VLE) of CO2 in aqueous AMP. The model predictions have been in good agreement with the experimental data of CO2 solubility in aqueous blends of this work as well as those reported in the literature. The current model can also predict speciation, heat of absorption, enthalpy of CO2 loaded aqueous AMP, pH of the loaded solution, and AMP volatility.

► (Vapour + liquid) equilibria of CO2 in aqueous AMP are measured in an equilibrium cell.
► Electrolyte-NRTL equation with RKS EoS is used to model VLE of CO2 in (AMP + H2O).
► The model is validated against experimental data of this work and literature data.
► The current model also predicts heat of absorption, pH and amine volatility.
► Aqueous AMP can be a good solvent for CO2 capture from coal power plant flue gas.