Mixing properties of (methanol, ethanol, or 1-propanol) with (n-pentane, n-hexane, n-heptane and n-octane) at 298.15 K

In this work, we present experimental values of the density, refractive index, speed of sound, and dynamic viscosity of the binary mixtures (methanol, ethanol or 1-propanol) with (n-pentane, n-hexane, n-heptane, and n-octane) at 298.15 K and atmospheric pressure, as a function of the molar fraction. From the experimental values, the corresponding excess and deviation values were computed (excess molar volumes, changes of refractive index on mixing, changes of isentropic compressibility and dynamic viscosity deviations), variable-degree polynomials being fitted to the results. Different methods were applied in order to estimate values of these physical properties, in good agreement with experiment. The binodal tie lines for each methanol + alkane binary mixture at different temperatures were determined by the measurement of physical properties and application of the corresponding fitting polynomials. UNIFAC-Dortmund group contribution method was applied to predict these liquid-liquid equilibria. (C) 1997 Elsevier Science B.V.