Excess enthalpy surfaces for alkanol-alkane mixtures by the uniquac model

Temperature and composition dependences of excess enthalpy surfaces and composition fluctuations were calculated using the uniquac model and the Kirkwood-Buff theory of statistical mechanics for seven alkanol-alkane mixtures. Surfaces of partial molar excess enthalpies and enthalpy of dilution were also calculated. Temperature-dependent parameters of the uniquac model in the range of 278.15-333.15 K were used in the calculations. The thermodynamic surfaces facilitate better understanding of thermodynamic properties of alkanol-alkane mixtures over the whole mole fraction range in a certain temperature interval. The uniquac model is capable of representing the thermodynamic properties of associating mixtures at low pressures.