Densities, Viscosities, and Refractive Indices of Binary Mixtures Containing n-Hexane + Components of Pine Resins and Essential Oils at 298.15 K

Abstract

Densities, ρ, viscosities, η, and refractive indices, n D, of binary mixtures containing n-hexane + α-pinene (2,6,6-trimethylbicyclo[3.1.1]hept-2-ene), + β-pinene (6,6-dimethyl-2-methylene bicyclo[3.1.1]heptane), + p-cymene (1-methyl-4-[1-methylethyl]benzene), + (S)-(−)-limonene [(−)-1-methyl-4-(1-methylethenyl)cyclohexene], + 1,8-cineole (1,3,3-trimethyl-2-oxabicyclo[2.2.2]octane), and + linalool (3,7-dimethyl-1,6-octadien-3-ol) were determined at 298.15 K and at atmospheric pressure using a digital density meter, a Schott viscosity measuring system, and an Abbe refractometer, respectively. The excess molar volumes, , deviations in viscosities, Δη, and deviations in molar refractions, ΔR, calculated from experimental measurements, are always negative, with the exception of the curve referring to the hexane + linalool mixture, which shows an inversion of sign. Results were fitted to the Redlich−Kister polynomial and qualitatively discussed in terms of molecular interactions. The McAllister multibody interaction model was used to correlate the kinematic viscosities of liquid mixtures with mole fractions.

Citrus Essential Oil Deterpenation by Liquid-Liquid Extraction

“…These purities were verifi ed by gas chromatography and the chemicals were used without further purifi cation. Their densities and refractive indices were measured at 298.15 K and atmospheric pressure, and are compared with published values (Riddick et al, 1986, Comelli et al, 2002 in Table 1. Densities were measured with an Anton Paar DMA 60/602 densimeter precise to within ± 10 -5 g·mL.…”

“…These curves were used to calibrate the gas chromatograph by an internal standard method. The chromatograph used was a Hewlett-Packard 5890 Series II apparatus equipped with a thermal conductivity detector and a HP-FFAP: 25 m×0.2 mm×0.3×µm capillary Riddick et al, 1986 (2) Comelli et al, 2002 column. Helium was used as mobile phase.…”

Essential oil deterpenation by solvent extraction using 1-ethyl-3-methylimidazolium 2-(2-methoxyethoxy) ethylsulfate ionic liquid

“…1 H and 13 C NMR were obtained to check that the ionic liquid synthesized was 1-ethyl-3-methylimidazolium 2-(2-methoxyethoxy) ethylsulfate. In Table 1 water content of pure compounds is reported, and their experimental densities and refractive indices are compared with the available values published by other authors [11][12][13][14].…”

Thermoacoustical Excess Properties of Binary Liquid Mixtures - A Comparative Experimental and Theoretical Study

“…Excess parameters, associated with a liquid mixture, are a quantitative measure of deviation in the behavior of the liquid mixture from ideality. The literature survey [8][9][10] reveals that most common way to evaluate the excess value of a given thermodynamic parameter is to use the equation…”