Abstract
The use of protic ionic liquids (PILs) as environmentally friendly green solvents has gained increasing interest in recent years for a variety of applications, including absorption refrigeration systems that use lithium bromide (LiBr). In this study, to gain a comprehensive understanding of the thermophysical properties of LiBr in water and aqueous solutions containing three different PILs (composed of the cations 2-hydroxyethylammonium, bis(2-hydroxyethyl)ammonium, and tris(2-hydroxyethyl)ammonium, with the acetate anion), a thorough investigation was conducted using ultrasonic, volumetric, viscometric, and electrical conductivity methods.Key thermophysical parameters such as apparent molar volume, apparent molar isentropic compressibility, viscosity B coefficient, and molar conductivity were calculated for the mentioned systems. Analyzing these thermophysical properties is essential for understanding the underlying forces in these liquid mixtures. The results revealed a significant influence of solute–solvent interactions in the studied systems, which were observed to increase with increasing PIL concentrations. Also, the co-sphere overlap model was employed to interpret the relation between hydrophilic-hydrophilic and ion-hydrophilic interactions, between PILs and LiBr along with a detailed analysis of the associated thermodynamic parameters.
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