Thermodynamics of amine + ketone mixtures: Volumetric, speed of sound data and viscosity at 303.15 K and 308.15 K for the binary mixtures of N,N-diethylaniline + aliphatic ketones (C3–C5) + 4-methyl-2-pentanone

Abstract

Measurement of densities (ρ), viscosities (η), and ultrasonic speeds (u) has been carried out for binary mixtures of N,N-diethylaniline (N,N-DEA) with acetone (AC), methylethylketone (MEK), methylpropylketone (MPK), diethylketone (DEK), and methylisobutylketone (MIBK), and their pure liquids at 303.15 K and 308.15 K over the entire composition range. These experimental values have been used to calculate the excess molar volume (VE), deviation in ultrasonic speeds (Δu), deviation in isentropic compressibility (Δκs), deviation in intermolecular free length (ΔLf), deviation in acoustic impedance (ΔZ), excess Gibbs free energy of activation of viscous flow (G∗E) and deviation in viscosity (Δη). The variation of these properties with composition of the mixtures suggests dipole–dipole interactions and charge-transfer complex formation between N,N-diethylaniline and dipolar ketones. The magnitude of the property is found to depend on the chain length of the ketones’ molecule. The viscosity data have been correlated using three equations: Grunberg and Nissan, Katti and Chaudhri and Hind et al. These results have been fitted to the Redlich–Kister polynomial using multiparametric nonlinear regression analysis to estimate the binary coefficients and standard errors.

Keywords

• Ultrasonic velocity
• Viscosity
• Density
• Excess thermodynamic parameters