Experimental Data and Modeling of the Density and Viscosity of Unloaded and CO₂-Loaded Aqueous Aminoethylethanolamine and Mixed Aminoethylethanolamine/Piperazine Solvents

Systematic density and viscosity data for aqueous solutions of aminoethylethanolamine (AEEA) and AEEA + piperazine (AEEA/PZ) blended amine systems at different temperatures, concentrations, and CO2 loadings, where the CO2 loadings ranged from 0 to 0.6 mol of CO2/mol of amine, were presented in this paper. Then, the density and viscosity data for these systems were modeled using different correlations as a function of the concentration of the alcohol amine, the CO2 loading, and the temperature. For the unloaded and CO2-loaded AEEA systems, the density and viscosity data were correlated using the modified Redlich–Kister equation and the Weiland equation, respectively, with average relative deviations (ARDs) of 0.16 and 2.40%, respectively. While the models using the “six-parameter” equation for both the density and viscosity of the aqueous AEEA/PZ solutions system result in ARD of 0.07 and 1.80%, respectively. These correlation modeling results will be helpful for thermodynamic analysis and process simulation of the carbon capture process for the aqueous alcohol amine system.