Physicochemical properties of a ternary liquid system containing Tri-n-butyl phosphate, benzene and m-xylene at temperatures ranging from 298.15 to 313. 15 K

Abstract

• Ultrasonic velocity ( U ), density ( ρ ) and viscosity ( η ) of ternary liquid mixtures (Tri-n‑butyl phosphate + benzene + m -xylene) were measured. • Deviation functions have been computed from experimental data and discussed graphically. • These deviation functions were fitted to Redlich-Kister type of polynomial equation to estimate coefficients and standard error. • Ultrasonic velocities of ternary system (TBP + benzene + m -xylene) were computed by using different theoretical models. • Molecular interactions between components of ternary system were discussed. Ultrasonic velocity, density and viscosity of ternary liquid system: Tri-n‑butyl phosphate + benzene + m -xylene have been measured at atmospheric pressure (0.1 MPa) and at temperature ranging from 298.15 to 313.15 K. The observed data were utilized to calculate various physicochemical properties such as relaxation time ( τ ), isentropic compressibility ( Ks ), intermolecular free length ( L f ) and free volume ( V f ). The deviation in isentropic compressibility ( ΔK s ), intermolecular free length ( ΔL f ) and free volume ( ΔV f ) were computed and fitted to the Redlich-Kister type of polynomial equation. The deviation functions were discussed in terms of molecular interactions existing between the unlike components of the system. Further, ultrasonic velocities were computed by using different theoretical models of ultrasonic velocity such as Nomoto's relation, Van Dael-Vangeel's ideal mixing relation, Impedance dependence relation and Rao's specific sound velocity relation and have been compared with the corresponding experimental data. The IDR model has shown close results to experimental observations.