Find in Library

This study presents measured density and viscosity of N-methyldiethanolamine (MDEA) + H₂O, Dimethylethanolamine (DMEA) + H₂O, and Diethylethanolamine (DEEA) + H₂O mixtures. The density was measured at amine mass fraction <i>w</i>₁ from 0.3 to 1 for the temperature range 293.15–353.15 K. The excess molar volumes <i>V^E</i> were determined from density data. Redlich–Kister type polynomials were proposed to fit <i>V^E</i> and density deviation <i>ln</i>(<i>ρ_γ</i>) to represent measured densities. The viscosity was measured at amine mass fraction <i>w</i>₁ from 0.3 to 1 for the temperature range 293.15–363.15 K. The viscosity deviation <i>η^E</i> and excess free energy of activation for viscous flow Δ<i>G^E*</i> were determined from measured viscosities and examined for intermolecular interactions among mixture molecules. Correlations were proposed to fit viscosity data with acceptable accuracies. The McAllister’s three-body model was adopted to fit kinematic viscosities determined from density and dynamic viscosity data. The results showed the importance of examining intermolecular interactions that are discussed in McAllister’s four-body model to improve the accuracies of data fits.