Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

The thermophysical properties, densities, speeds of sound and dynamic viscosities of pure ionic liquid, 1-ethyl-3-methylimidazolium ethylsulfate, ([EMIM][ES]), and solvents 1-butanol, methanol and their binary and ternary mixtures have been measured experimentally at a temperature range from 298.15 K to 323.15 K, and at pressure 0.1 MPa by using Anton Paar vibrating tube density and sound velocity meter DSA 5000M and Lovis microviscometer 2000M. The excess molar volumes VE, excess molar isentropic compressibility, and viscosity deviations have been calculated using the experimental data at the same temperature range and pressure for [EMIM][ES] + 1-butanol/methanol binary systems and the VE, excess isentropic compressibility, and viscosity deviations for ternary [EMIM][ES] + 1-butanol + methanol system. The excess molar volume, molar and excess isentropic compressibility, excess molar isentropic compressibility and viscosity deviations data for the studied binary/ternary systems have been fitted to Redlich-Kister equation. The variations in VE, excess isentropic compressibility, excess molar isentropic compressibility and viscosity deviations values with changes in composition and temperature have been discussed in terms of hydrogen bonding, ion dipole interactions and structural effects on mixing of ILs and solvents.