Vapor–liquid equilibria at 333.15 K and excess molar volumes and deviations in molar refractivity at 298.15 K for mixtures of diisopropyl ether, ethanol and ionic liquids

In this work, we have studied influence of ionic liquids (ILs) on the azeotrope composition for the system {diisopropyl ether (DIPE) + ethanol} using trihexyltetradecylphosphonium chloride ([P666,14][Cl]) and trihexyltetradecylphosphonium bis(2,2,4-trimethylpentyl) phosphinate ([P666,14][TMPP]). Isothermal vapor–liquid equilibrium data at 333.15 K are reported for the ternary systems {DIPE + ethanol + [P666,14][Cl]} and {DIPE + ethanol + [P666,14][TMPP]} with varying the mole fraction of ILs from 0.05 to 0.10. The experimental ternary VLE data were correlated using the Wilson equation. In addition, excess molar volumes (VE) and deviations in molar refractivity (ΔR) data at 298.15 K are reported for the binary systems {DIPE + [P666,14][Cl]} and {ethanol + [P666,14][Cl]} by a digital vibrating tube densimeter and a precision digital refractometer. The VE and ΔR were correlated by the Redlich–Kister equation.

► Diisopropyl ether (DIPE) is considered as a benign gasoline.
► VLE data for the systems {DIPE + ethanol + [P666,14][Cl]} and {DIPE + ethanol + [P666,14][TMPP]}.
► VE and ΔR for the binary systems {DIPE + [P666,14][Cl]} and {ethanol + [P666,14][Cl]}.
► VE and ΔR showed a negative deviation.
► VE and ΔR were calculated from the binary data.