Thermodynamic properties of binary mixtures of isooctane and n-alkane at 298.15 k

Abstract

Excess molar volumes, V m E , viscosities and the derived excess molar activation energies of viscous flow were determined for binary mixtures of isooctane with n-hexane, n-heptane, n-nonane, n-decane, n-dodecane, n-tetradecane and n-hexadecane at 298.15 K. V m E is negative over the whole mole fraction range for all the systems studied. The Flory theory of mixtures has been used to interpret excess molar volume data, V m E for isooctane+ n-hexane, + n-octane (data from Awwad and + n-hexadecane. Values of V m E are well predicted and this work shows the importance of the three contributions to the V m E , of the heat of mixing (i.e., X 12), the differences in free volume and the P* effect.