Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Experimental data for density (q), speed of sound (u) and refractive index (nD) for pure 1-ethyl-3- methylimidazolium ethyl sulfate ([Emim][EtSO4]), 2-propoxyethanol and their binary mixtures are measured over the whole composition range as a function of temperature between 298.15 and 328.15 K at atmospheric pressure. Experimental values are used to calculate the excess molar volumes (VE m), excess partial molar volumes (VE m), partial molar volumes at infinite dilution (VE;1 m ), excess/deviation values of isentropic compressibility (jEs ), free length (LEf ), acoustic impedance (ZE), speeds of sound (uE), refractive index (D/nD) and isobaric thermal expansion coefficient (aEP ) for the binary mixtures. These excess/deviation properties are fitted to the Redlich Kister type equation to obtain the coefficients and the standard deviations. The negative values of excess properties such as VE m, jES , LEf , aEP and positive values of ZE, uE, D/nD indicate existence of strong interaction between studied components. A quantitative analysis of these parameters was further supported by IR spectroscopy analysis.