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, refractiv e 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 e xcess and deviation values were computed (excess molar volumes, change s 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 esti mate values of these physical properties, in good agreement with exper iment. The binodal tie lines for each methanol + alkane binary mixture at different temperatures were determined by the measurement of physi cal properties and application of the corresponding fitting polynomial s. UNIFAC-Dortmund group contribution method was applied to predict th ese liquid-liquid equilibria. (C) 1997 Elsevier Science B.V.