Thermodynamics of haloarenes with n-hexane at 298.15–318.15 K: Density, ultrasonic speed and viscosity

Abstract

Densities (ρ), ultrasonic speeds (u) and dynamic viscosity (η) of the binary 2-chlorotoluene or 4-chlorotoluene or 1,3-dichlorobenzene (1) + n-hexane (2) mixtures were measured at (T = 298.15–318.15) K and atmospheric pressure. Using these measurements, excess volume (VmE), excess ultrasonic speed (uE) and deviation in dynamic viscosity (Δη) were calculated. Excess isentropic compressibility (κsE) was calculated using ρ and u values. The VmE values have been interpreted by Prigogine-Flory-Patterson (PFP) theory. The VmEobtained using PFP theory agree well with experimental values. The u values were also calculated using various empirical relations. The available volume (Va) and intermolecular free length (Lf) were calculated using experimental u values employing Jacobson free length theory. The Δη values were coupled with VmE values to understand intermolecular interaction. Further, Bloomfield and Dewan model was applied to calculate η and Δη values of the studied binary mixture and calculated values agree well with experimental values.