THERMODYNAMICS OF LIQUID-MIXTURES OF 2 NORMAL-ALKANES

The excess molar volume VE of liquid mixtures of two n-alkanes is predicted essentially on the basis of the van der Waals model. The important feature of the treatment is that VE may be calculated from the respective densities, isobaric expansivities and isothermal compressibilities of the pure liquids, whereas data of solution properties need not be known. Neither any combining rules nor empirically adjusted parameters are used. Computed values are slightly less negative than the observed excess volumes, the average deviation being about 10%. © by Akademische Verlagsgesellschaft