Studies of Associated Solutions: Evaluation of Thermodynamic Parameters of Blends of 2-Methylaniline and Substituted Ethanols at Various Temperatures

Densities (ρ), speeds of sound (u), and viscosities (η) are reported for binary mixtures of 2-methylaniline with substituted ethanols (2-phenylethanol, 2-chloroethanol and 2-aminoethanol) over the entire composition range of mole fraction at T = (303.15–318.15) K and at atmospheric pressure, 0.1 MPa. The excess molar volume, excess isentropic compressibility and deviation in viscosity are calculated from the corresponding experimental densities, speeds of sound and viscosities. The excess properties are correlated using the Redlich–Kister polynomial smoothing equation. Excess partial molar volumes and excess partial molar isentropic compressibilities were calculated for all the binary systems throughout the composition range and also at infinite dilution. The variations in these properties with composition, for all the binary mixtures, suggest that loss of dipolar association, difference in size and shape of the component molecules, dipole–dipole interaction and hydrogen bonding between molecules of 2-methylaniline with 2-phenylethanol, 2-chloroethanol and 2-aminoethanol are involved.