Abstract

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 ([P 666,14][Cl]) and trihexyltetradecylphosphonium bis(2,2,4-trimethylpentyl) phosphinate ([P 666,14][TMPP]). Isothermal vapor–liquid equilibrium data at 333.15 K are reported for the ternary systems {DIPE + ethanol + [P 666,14][Cl]} and {DIPE + ethanol + [P 666,14][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 ( V E) and deviations in molar refractivity (Δ R) data at 298.15 K are reported for the binary systems {DIPE + [P 666,14][Cl]} and {ethanol + [P 666,14][Cl]} by a digital vibrating tube densimeter and a precision digital refractometer. The V E and Δ R were correlated by the Redlich–Kister equation.

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