Density, Viscosity and Excess Properties of Binary Mixtures of Protic Ionic Liquid (2-Hdeaf, 2-Hdeaa) + Water at Different Temperatures

Abstract

Over the last decade, ionic liquids (IL) have attracted considerable attention for their potential to replace traditional volatile organic solvents due to their well-known physico-chemistry properties. This is an important topic for industrial applications today, and have been the subject of extensive literature studies. Nevertheless, there is still a lack of experimental thermodynamics data on aqueous mixtures, i.e., ionic liquids + water, especially volumetric and transport properties. These data could provide essential information about interactions and molecular phenomena in such mixtures. To investigate volumetric and transport properties for ionic liquids + water, density and viscosity data of the protic ionic liquids 2-hydroxydiethanolamine formate (2-HDEAF), 2-hydroxydiethanolamine acetate (2-HDEAA), water and their binary mixtures were measured at T = (293.15 to 343.15) K and atmospheric pressure. Excess molar volumes and deviation of viscosity were computed from experimental density and viscosity values and were fit to the Redlich-Kister equation. We observed a negative behavior for both ionic liquids + water mixtures that can be attributed to a shrinkage of the mixtures.

Liquid Densities and Speed of Sound for Ionic Liquid (2-HEAA and 2-HDEAA) + Alcohol (1-Propanol and 2-Propanol) Mixtures at T = (293.15–323.15 K) and Atmospheric Pressure

“…In summary, intermolecular interaction between ILs and alcohols could be related to the self-association between the molecules, presence of the forces of van der Waals, as well as the H-bond influence in those interactions. All these phenomena are directly allied to ILs peculiar characteristics, that is, they could easily interact with other solvent molecules, such as alcohols through ionic interactions, intermolecular and intramolecular hydrogen bonding, and dipolar interactions. − …”