Densities, Viscosities, and Speeds of Sound of Binary Mixtures of Heptan-1-ol with 1,4-Dioxane at Temperatures from (298.15 to 323.15) K and Atmospheric Pressure

Abstract

Densities, ρ exp, viscosities, η exp, and speeds of sound, c exp, of pure heptan-1-ol and 1,4-dioxane and their binary mixtures have been measured over the entire range of composition at temperatures from (298.15 to 323.15) K with an interval of 5 K and at the atmospheric pressure. The experimental data have been used to calculate the following: excess molar volumes, V m E, deviation in speeds of sound, Δ c, isentropic compressibility, κ s, deviation in isentropic compressibility, Δκ s, and viscosity deviations, Δη. The values of V m E and Δκ s have been found to be positive throughout the composition range and at all temperatures, whereas Δ c and Δη were negative. The excess or deviation properties ( V m E, Δ c, Δκ s, or Δη) have been correlated using a Redlich–Kister type equation to obtain their coefficients and standard deviations. The modified Rackett equation has been employed to correlate with the experimental molar volume of the component liquids and the binary mixtures. The measured mixture viscosity data have been correlated using semiempirical models, such as Andrade/DIPPR and Grunberg–Nissan. The thermodynamic, transport, and acoustic behaviors have been discussed in terms of the molecular interactions and structural effects due to the components of the binary mixtures. Furthermore, the diversity in the thermodynamic or transport behavior of the binary mixtures of 1,4-dioxane with heptan-1-ol and other alkan-1-ol systems has been compared and discussed in terms of the changes in the chain length or the solution properties of the mixed systems.