Temperature Effect on Density and Viscosity of 2-(Methylamino)ethanol or Monoethanolamine + Diethylene or Triethylene Glycol Binary Mixtures

The development of hybrid solvents represents a promising strategy for optimizing CO 2 capture processes by mitigating the high-energy requirements of conventional solvents. In this context, accurate data on the thermodynamic properties of water-lean solvent mixtures are valuable from both academic and industrial perspectives. This work presents experimental density and viscosity data for binary mixtures containing alkanolamines (monoethanolamine and 2-(methylamino)-ethanol) and glycols (diethylene glycol and triethylene glycol) over the temperature range T = (293.15–353.15) K at atmospheric pressure. Furthermore, based on these experimental findings, excess molar volume, viscosity deviation, and isobaric thermal expansion coefficient were calculated. The results indicate strong intermolecular interactions, attributed to hydrogen bonding between amines and hydroxyl groups in the alkanolamines and hydroxyl groups in the glycols. These data provide a fundamental thermodynamic basis for the design and modeling of carbon capture processes using nonaqueous solvents.