Investigation on Temperature-Dependent Volumetric and Acoustical Properties of Homologous Series of Glycols in Aqueous Sorbitol Solutions

Abstract

In the present study, the combination of volumetric and acoustical studies is used to investigate the interactions of ethylene glycol, diethylene glycol, and triethylene glycol with sorbitol as a function of temperature. Densities and ultrasonic velocities of ethylene, diethylene, and triethylene glycol in (0.00, 0.01, 0.03, 0.05) mol·kg–1 aqueous solutions of sorbitol have been measured at temperatures T = (288.15, 298.15, 308.15, 318.15) K and experimental pressure p = 0.1 MPa. With the help of density data, the apparent molar volume Vϕ, the partial molar volume Vϕo, and the partial molar volumes of transfer ΔVϕo, from water to aqueous sorbitol solutions have been computed. The values for partial molar expansibility (∂Vϕ0/∂T)p and second order derivative (∂2Vϕ0/∂T2)p have also been determined. From ultrasonic velocity values, apparent molar isentropic compression Kϕ,s, partial molar isentropic compression Kϕ,so, and partial molar isentropic compression of transfer ΔKϕ,so, are evaluated. The computed val...