Volumetric and acoustic properties of butylacetate with some alkan-1-ols (C₁–C₆) at 298.15 K

Abstract

Densities, ρ and speeds of sound, u data have been measured for binary mixtures of butylacetate with alkan-1-ols, namely, methanol, ethanol, propan-1-ol, butan-1-ol, pentan-1-ol and hexan-1-ol at 298.15 K and atmospheric pressure. From the experimental results, excess molar volumes,

and partial molar volumes,

were also calculated.

for butylacetate + methanol mixtures is negative over the entire range of mole fractions and positive values are obtained for all the remaining mixtures. For

their values have been extrapolated to zero concentration to obtain the limiting value at infinite dilution,

. Further, isentropic compressibilities, k _s and Rao's molar sound function, R _m of the mixtures were computed by combining sound velocity and density data. Deviation in isentropic compressibility, Δk _s were evaluated using volume fraction, ϕ weighing of the individual component properties to estimate ideal mixture behavior. The Δk _s values are positive over the whole of volume fraction for all the mixtures. An inversion of sign in Δk _s is observed in the system butylacetate + methanol, at around 0.65 volume fraction of butylacetate. For all mixtures the V ^E and Δk _s results were satisfactorily correlated by the Redlich–Kister polynomial. The results are explained in terms of dissociation of the self-associated alkan-1-ol molecules and the formation of aggregates between unlike molecules.

Keywords:

• Excess molar volumes
• Speeds of sound
• Butylacetate
• Alkan-1-ols
• Redlich–Kister equation

Acknowledgements

The authors are thankful to the university authorities for providing the necessary facilities to carry out the research.