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

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 (κsE) 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 κsE curves were predicted well with the Singh model and ab – initio approach. At each temperature, the κsE 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.