LAUSR

Abstract The physicochemical properties of the binary mixtures of magnetic ionic liquids (MILs) are essential for industrial process designs of their applications. In this work, three MILs were synthesized and characterized, including 1-butyl-3-methylimidazolium tetrachloroferrate ([Bmim][FeCl 4 ]), 1-hexyl-3-methylimidazolium tetrachloroferrate ([Hmim][FeCl 4 ]) and 1-octyl-3-methylimidazolium tetrachloroferrate ([Omim][FeCl 4 ]). Densities and viscosities of binary mixtures of these MILs with ethyl acetate (EA) were determined over the whole range of compositions at temperatures (293.15 to 323.15) K at 5 K intervals. The data of densities as a function of temperature were fitted with linear equation and viscosities were correlated with Vogel–Fucher–Tammann (VFT) equation. Results showed that the densities and viscosities of the binary mixtures decreased significantly with the IL concentration decreasing and with temperature increasing. Excess molar volumes ( V E ) and viscosity deviations (Δ η ) were calculated and fitted well with the Redlich-Kister equation. The negative V E and Δ η over the entire composition range indicated that there were stronger interactions between MILs and EA than those among MILs and among EA.