Physical properties of (jojoba oil + n-hexane) compared with other (vegetable oil + n-hexane) mixtures

Abstract

Vapour pressures, densities, and viscosities of (jojoba oil + n-hexane) were measured and correlated over the temperature interval (298.15 to 318.15) K and used to calculate the activity coefficients of the components, excess thermodynamics functions, excess molar volumes, isobaric thermal expansibilities, excess viscosities, and the excess Gibbs free energies of activation for viscous flow. The reported results are compared with the corresponding values for commercial (oil + n-hexane) mixtures (cottonseed, soybean, sunflower, corn, olive, grape pip, Vaseline, and linalool oils) reported in the literature. As a by-product of this investigation, the vapour pressures of 1-methoxy-2-propanol from T = (298 to 392) K, 2-ethyl-6-methylaniline from T = (313 to 448) K, and N-methoxyisopropanol-6-ethyl-2-methylaniline from T = (407 to 535) K were measured using an ebulliometric method. A remarkable similarity between the excess properties for all oils is observed, but the behaviour of the excess thermodynamic functions in the case of ( n-hexane + jojoba oil), especially in the n-hexane rich region, is quite different.