Transport and acoustic properties of pentyl acetate with butanol at 298.15 K to 318.15 K: Singh model and ab-initio approach

Abstract

ABSTRACT The viscosity ( η ) and speed of sound ( u ) of binary pentyl acetate (1) + isomers of butanol (2) mixtures were reported at T = 298.15 K to 318.15 K and at 0.1 MPa pressure. Using the experimental data, deviation in viscosity ( Δη ), deviation in speed of sound ( Δu ), and excess isentropic compressibility ( κ s E ) were determined and these were fitted with the RK equation. The findings suggest that the behaviour of a mixture is affected by intermolecular interactions (dipole – dipole, H – bonding, dispersive, and cohesive force) and structural aspects of the molecule. The Δη and κ s E curves were predicted well with the Singh model and ab – initio approach. At each temperature, the κ s E values were positive for binary mixtures, whereas the Δη and Δu values were negative. The numeric values of u were determined through numerous correlations. This study delves into the relative importance of these relations with the experimental values of u .