Experimental data for density (rho), speed of sound (u) and refractive index (n(D)) 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 298.15-328.15 K at atmospheric pressure. Experimental values are used to calculate the excess molar volumes (V-m(E)), excess partial molar volumes ((V) over bar (E)(m)), partial molar volumes at infinite dilution ((V) over bar (E,infinity)(m)), excess/deviation values of isentropic compressibility (kappa(E)(s)), free length (L-f(E)), acoustic impedance (Z(E)), speeds of sound (u(E)), refractive index (Delta(phi)n(D)) and isobaric thermal expansion coefficient (alpha(E)(p)) 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 V-m(E),kappa(E)(s),L-f(E),alpha(E)(p) and positive values of Z(E), u(E), Delta(phi)n(D) indicate existence of strong interaction between studied components. A quantitative analysis of these parameters was further supported by IR spectroscopy analysis. (C) 2016 Elsevier Ltd.