Abstract

Density (r), viscosity (η) and speed of sound (u) for binary mixtures of oleic acid with methyl acetate, ethyl acetate, n-propyl acetate and n-butyl acetate were measured at 303.15, 308.15 and 313.15 K over the whole composition range at atmospheric pressure. These results were used to calculate excess molar volumes (V^E), deviations in viscosity (Δη), deviations in speed of sound (Δu), the excess Gibbs free energies of activation of viscous flow (G*^E), deviation in adiabatic compressibility (Δk_S), acoustic impedance (Z) and deviation in acoustic impedance(ΔZ). These results were fitted to Redlich-Kister type polynomial equation of the third degree to derive the binary coefficients. The standard error values were estimated between the calculated and experimental data.

Key words: Density, viscosity, ultrasonic speed, oleic acid, alkyl esters.