Study of intermolecular interactions in binary mixtures of 3-chloroaniline with isomeric chlorotoluenes at various temperatures

Add time:08/19/2019    Source:sciencedirect.com

The densities (ρ), ultrasonic speeds (u), and viscosities (η) are reported for binary mixtures of 3-chloroaniline with isomeric chlorotoluenes such as o-chlorotoluene (o-CT), m-chlorotoluene (m-CT), and p-chlorotoluene (p-CT) over the entire range of mole fractions at 303.15, 308.15, 313.15 and 318.15 K and atmospheric pressure. The excess properties such as excess molar volume, excess isentropic compressibility and deviation in viscosity are calculated from the density, speed of sound and viscosity. Excess properties are correlated by the Redlich–Kister equation. The partial molar volumes, V̅m,1 and V̅m,2, partial molar isentropic compressibilities, K̅s,m,1 and K̅s,m,2, excess partial molar volumes, V̅m,1Eand V̅m,2E and excess partial molar isentropic compressibilities, K̅s,m,1E and K̅s,m,2Eover whole compositions range and at infinite dilutions have been calculated; partial molar volumes, V̅m,1° and V̅m,2°, partial molar isentropic compressibilities, K̅s,m,1° and K̅s,m,2°, excess partial molar volumes, V̅m,1°E and V̅m,2°E, excess partial molar isentropic compressibilities, K̅s,m,1°E and K̅s,m,2°E of the components at infinite dilution have been calculated. The VE results have been analyzed in the light Prigogine-Flory-Patterson theory. Analysis of each of the three contributions viz. interactional, free volume and p* to VE shows that interactional contribution is positive for all systems expect p-chlorotoluene, which has small negative interactional contribution. The free volume effect and p* contribution are negative for all the mixtures. The variations of these parameters with composition and temperature have been discussed in terms of intermolecular interactions prevailing in these mixtures.

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