Experimental Study of CO2 Solubility in Aqueous Solution of Monoethanolamine and 2-Amino-2-Methyl-Propanol Blended Amine Using Electrolyte-NRTL Model

The technology of reducing CO₂ is a critical issue in various industries. Some kinds of alkanolamines have been used for CO₂ absorption: primary (monoethanolamine, MEA), secondary (diisopropylamine, DIPA), tertiary (methyldiethanolamine, MDEA) and steric hindrance (2-amino-2-methyl-1-propanol, AMP) amines. MEA has been used to process of CO₂ sequestration because of high reactivity and reasonable cost. AMP is applied as a stable amine for high CO₂ absorption capacity. In this study, equilibrium solubility of CO₂ in MEA and AMP mixtures were evaluated by using experimental data and thermodynamic models. The solubility of CO₂ was measured at various temperatures and amine mass fractions. The Electrolyte-NRTL model is used to estimate interactions between chemical species in liquid phase. To consider the non-ideality, activity coefficients, Electrolyte-NRTL model, were regressed from experimental data.