VOLUMETRIC AND THERMODYNAMIC STUDIES OF MOLECULAR INTERACTIONS IN BINARY LIQUID MIXTURES OF N-ALKANES WITH HEPTAN-2-OL AT 298.15 K: COMPARISON WITH PRIGOGINE-FLORY-PATTERSON THEORY

Abstract

Densities, ρ, viscosities, η, and sound speeds, u, have been measured as a function of composition for binary mixtures of n-octane, n-decane, n-dodecane, and n-tetradecane with heptan-2-ol at 298.15 K and atmospheric pressure. From these measurements the excess molar volume (), deviations in viscosity (Δη), and excess isentropic compressibility (k ^E s), were calculated. These results were fitted to Redlick-Kister polynomial equations to estimate the binary coefficients and standard errors. The experimental results were used to test the applicability of the Prigogine-Flory-Patterson (PFP) theory. McAllister's multibody interaction model was used to correlate kinematic viscosity data. The Jouyban-Acree model was also used to correlate the experimental values of density, viscosity, and ultrasonic velocity at T = 298.15 K. The effects of size and shape of the components on excess properties are discussed. The results are discussed in terms of molecular interactions prevailing in the mixtures.

Keywords:

• Density
• Excess properties
• Jouyban-Acree model
• McAllister's multibody model
• PFP theory
• Viscosity

Acknowledgments

The authors are thankful to Prof. B. R. Arbad, head of the Chemistry Department, Dr. B. A. M. University for their valuable suggestions and discussion. The authors are also thankful to Principal Dr. R. S. Agarwal, J.E.S. College, Jalna, for the facilities provided.

Notes

^a Fractional glass distillation.

^b Gas-liquid chromatography, HP6980 using FID detector.

^c Gas-liquid chromatography, DB WAX using FID detector.

^a Baragi et al., 2006.

^b Treszczanowicz and Benson, 1978.

^c Riddick et al., 1986.

^d Gonzalez et al., 2004.

^e Iloukhani et al., 2006.

int = interactional; fv = free volume.