Effect of composition and temperature variations on thermophysical properties of binary and ternary mixtures of 1-ethyl-3-methylimidazolium ethylsulfate with 1-butanol and/or methanol

Abstract The thermophysical properties, densities, ρ, speeds of sound, u and dynamic viscosities, η of pure ionic liquid, 1-ethyl-3-methylimidazolium ethylsulfate, ([EMIM][ES]), and solvents 1-butanol, methanol and of their binary and ternary mixtures have been measured experimentally at a temperature range from (298.15–323.15) K, with an interval of 5 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, V E , isentropic compressibilities, κ s , molar isentropic compressibilities, К s , m , excess molar isentropic compressibility, К s , m E , and viscosity deviations Δη have been calculated using the experimental ρ, u and η data at the same temperature range and pressure for [EMIM][ES] + 1-butanol/methanol binary systems and the V E , κ s , excess isentropic compressibility, κ s E and Δη for ternary [EMIM][ES] + 1-butanol + methanol system. The V E , κ s E , К s , m E and Δη data for the studied binary/ternary systems have been fitted to Redlich-Kister equation. The variations in V E , κ s E , К s , m E and Δη 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.