Interaction of 1-Butyl-3-methylimidazolium Trifluoromethanesulfonate with Ethyl Acetate/1-Butanol: Thermophysical Properties

Abstract

Densities, speeds of sound and viscosities of pure and the binary mixtures of [BMIM][CF3SO3] + ethyl acetate or 1-butanol have been measured over the entire range of mole fractions at T = (298.15–323.15) K and at 0.1 MPa pressure using an Anton Paar density and sound velocity meter DSA 5000M and a Lovis microviscometer 2000M. The excess molar volumes (VE), viscosity deviations (Δη) and the isentropic compressibility deviations (ΔκS) have been calculated using the experimental data. The variations in VE, Δη and ΔκS with changes in mole fraction and temperature have been interpreted in terms of ion–dipole interactions and structural effects on mixing of IL and solvents. The Redlich–Kister equation has been fitted to the VE, Δη and ΔκS values using a multi-parametric nonlinear regression method. The PFP theory has been applied to correlate the excess molar volumes. The experimental and PFP correlated values of VE are found to be quite close to each other.