Density, viscosity and free energy of activation for viscous flow of CO2 loaded 2-amino-2-methyl-1-propanol (AMP), monoethanol amine (MEA) and H2O mixtures

This work presents an experimental study of densities and viscosities of aqueous AMP (2-amino-2-methyl-1-propanol) + MEA (monoethanol amine) + H2O solutions with and without CO2. Amine concentrations were at AMP to MEA mass % ratios of 21/9, 24/6, 27/3 by maintaining 70 mass % of H2O. Density measurements were performed in a temperature range from 293.15 K to 343.15 K and viscosity was measured at temperatures from 293.15 K to 363.15 K. The excess molar volume was determined from experimental density data. A Redlich-Kister type polynomial of excess molar volume was adopted to represent the density of unloaded aqueous mixtures. For CO2 loaded solutions, Setschenow-type correlations and modified Weiland's density and viscosity correlations were used to fit density and viscosity data. Eyring's viscosity model was used to evaluate free energy of activation for viscous flow of mixtures through measured density and viscosity data. The volumetric and viscometric properties of aqueous mixtures were analyzed through the molecular structure and interactions. A correlation was proposed for the free energy of activation of viscous flow to represent viscosity of CO2 loaded solutions. The results reveal that the proposed correlations for the density and viscosity of mixtures are in good agreement with measured data. (C) 2020 The Authors. Published by Elsevier B.V.