Investigation of Some Physicochemical Properties of Mixtures of Morama Seed Oil with (C6–C9) n-Alkanes at 298.15 and Atmospheric Pressure

• Published in: Journal of the American Oil Chemists' Society 2014-06, Vol.91 (6), p.1065-1075
• Main Authors: Yeboah, S. O., Oathotse, I., Ddamba, W. A. A.
• Format: Article
• Language: English
• Subjects: Agriculture; Atmospheric pressure; Biomaterials; Biotechnology; Chemistry; Chemistry and Materials Science; Density; Dynamic viscosity; Excess free energy of activation of viscous flow; Excess molar free volume; Excess molar volume; Food Science; Industrial Chemistry/Chemical Engineering; Isentropic compressibility; Morama; n‐Alkanes; Oils & fats; Original Paper; Physicochemical properties; Tylosema esculentum; Vegetable oils; Viscosity; Viscous flow
• ISSN: 0003-021X; 1558-9331
• DOI: 10.1007/s11746-014-2450-1

Densities ρ , ultrasonic speeds u and dynamic viscosities η , of mixtures of morama, Tylosema esculentum , seed oil with n -hexane, n -heptane, n -octane and n -nonane were determined over the entire composition range at 298.15 K and atmospheric pressure. Excess molar volumes, V m E , excess molar free volumes V f E , deviations in isentropic compressibility, ∆ κ s , deviations in ultrasonic speed, ∆ u , deviations in viscosity, ∆ η , and the excess free energy of activation of viscous flow, Δ G* E , were calculated therefrom and correlated by the Redlich–Kister equation for each of the [morama seed oil + ( n -hexane or n -heptane or n -octane or n -nonane)] mixtures. The results have been discussed in terms of possible intermolecular interactions and structural effects.