Measurement and Thermodynamic Modeling of the Solubility of CO2 in the Aqueous Mixtures 2-Amino-2-methyl-1-propanol (AMP) and 2-(2-aminoethylamine)ethanol (AEEA)

Different techniques such as physical and chemical absorption are used for the removal of carbon dioxide. Alkanolamines are widely used as a chemical absorbent for acid gas purification. Among the alkanolamines, 2-(2-aminoethylamine)ethanol (AEEA) and 2-amino-2-methyl-1-propanol (AMP) have a high absorption capacity. In this work, the equilibrium solubility of CO2 in aqueous mixtures of AEEA and AMP is measured at different partial pressures (0.25 to 0.85)kPa and different temperatures (30 to 60) C•. The measurements are shown that carbon dioxide loading is increased by rising the amount of AEEA/AMP mole ratio in the solution. Also, the solubility of CO2 is increased at higher partial pressures. The Extended UNIQUAC method is used to model the behavior of the mixture. In order to model the quaternary system (AMP–AEEA–CO2–Water), binary interaction parameters for ternary subsystems (AMP–CO2–Water) and (AEEA–CO2–Water) are optimized. By the Extended UNIQUAC model the CO2 partial pressures are obtained in the ternary subsystems (AMP–CO2–Water) and (AEEA–CO2–Water) with average absolute percent deviations (AAD%) equal to 19.23 and 12.9, respectively. Finally, binary interaction parameters for the quaternary system (AMP–AEEA–CO2–Water) are optimized and the CO2 partial pressures in an aqueous mixture of AEEA + AMP are obtained with AAD% = 17.54.