Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Speeds of sound u, isentropic compressibilities jS, viscosities g, excess isentropic compressibilities jE S , excess molar volumes V E m excess viscosities gE, and excess Gibbs energy of activation DG*E of viscous flow have been investigated for seven binary mixtures of methylcyclohexane (MCH) with ethanol, 2-propanol, 2-butanol, 2-pentanol, 2-hexanol, 2-heptanol, and 2-octanol at 298.15 K. Excess properties were calculated therefrom and were correlated by Redlich Kister type function in terms of mole fractions. For mixtures of MCH with used 2-alkanols, over the entire range of mole fractions, V E m is positive and both gE and DG*E are negative. The jE S values are large and positive over the entire range of composition for mixtures of MCH with ethanol, 2-propanol, 2-butanol and for mixtures of MCH with 2-pentanol, 2-hexanol, 2-heptanol and 2-octanol change sign from positive in the 2-alkanol rich regions to negative in MCH rich regions. These results are consistent with the self-association of 2-alkanols and the nonpolar character of MCH, which produces the dissociation of the 2-alkanols. The viscosity, speeds of sound and isentropic compressibility data have been correlated with the various equations.