Excess Molar Enthalpies and Excess Molar Volumes of Binary Mixtures Containing 1,3-Dioxolane or 1,4-Dioxane + Pine Resins at (298.15 and 313.15) K and at Atmospheric Pressure
Abstract:Excess molar enthalpies,
, and excess molar volumes,
, of binary mixtures containing 1,3-dioxolane
or 1,4-dioxane + α-pinene, + β-pinene, or + p-cymene were determined at (298.15 and 313.15) K and at
atmospheric pressure over the entire composition range using a flow microcalorimeter and a digital density
meter.
and
are always positive, and the temperature dependence is more marked for
values.
Results were fitted to the Redlich−Kister polynomials to obtain the binary adjustable parameters and
the sta… Show more
“…The adjustable parameters a k were determined by fitting the experimental values to eq 7 with the least-squares method, and the results are given in Table . The tabulated standard deviations, σ( ), reported in Table were defined as in previous papers. , 3 Deviation of refractive indices, Δ R , vs the mole fraction, x 1 , of n- hexane (1) + α-pinene (2) (★), + β-pinene (2) (◆), + p -cymene (2) (solid triangle pointing right), + ( S )-(−)-limonene (2) (▴), + 1,8-cineole (2) (▪), and + linalool (2) (·) at 298.15 K. The full lines are calculated with the Redlich−Kister equation.…”
Section: Resultsmentioning
confidence: 99%
“…Following our studies on thermodynamic and bulk properties of binary mixtures containing pine resins and essential oils, − we report in this paper measurements of densities, viscosities, and refractive indices of binary mixtures containing n- hexane + α-pinene, + β-pinene, + p-cymene, + ( S )-(−)-limonene, + 1,8-cineole, and + linalool at 298.15 K and at atmospheric pressure. This work is aimed to provide information about these mixtures, to investigate correlations among them, and to give a qualitative interpretation in terms of molecular interactions.…”
Section: Introductionmentioning
confidence: 99%
“…We have taken n- hexane as component 1 to obtain a comparison between the simple molecule of this component and those of dialkyl carbonates and ethers, studied in previous papers. ,, …”
Section: Introductionmentioning
confidence: 99%
“…We have taken n-hexane as component 1 to obtain a comparison between the simple molecule of this component and those of dialkyl carbonates and ethers, studied in previous papers. 5,6,8 No experimental data about these mixtures have been found in the literature, where only a few papers are available concerning vapor-liquid equilibrium studies.…”
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.
“…The adjustable parameters a k were determined by fitting the experimental values to eq 7 with the least-squares method, and the results are given in Table . The tabulated standard deviations, σ( ), reported in Table were defined as in previous papers. , 3 Deviation of refractive indices, Δ R , vs the mole fraction, x 1 , of n- hexane (1) + α-pinene (2) (★), + β-pinene (2) (◆), + p -cymene (2) (solid triangle pointing right), + ( S )-(−)-limonene (2) (▴), + 1,8-cineole (2) (▪), and + linalool (2) (·) at 298.15 K. The full lines are calculated with the Redlich−Kister equation.…”
Section: Resultsmentioning
confidence: 99%
“…Following our studies on thermodynamic and bulk properties of binary mixtures containing pine resins and essential oils, − we report in this paper measurements of densities, viscosities, and refractive indices of binary mixtures containing n- hexane + α-pinene, + β-pinene, + p-cymene, + ( S )-(−)-limonene, + 1,8-cineole, and + linalool at 298.15 K and at atmospheric pressure. This work is aimed to provide information about these mixtures, to investigate correlations among them, and to give a qualitative interpretation in terms of molecular interactions.…”
Section: Introductionmentioning
confidence: 99%
“…We have taken n- hexane as component 1 to obtain a comparison between the simple molecule of this component and those of dialkyl carbonates and ethers, studied in previous papers. ,, …”
Section: Introductionmentioning
confidence: 99%
“…We have taken n-hexane as component 1 to obtain a comparison between the simple molecule of this component and those of dialkyl carbonates and ethers, studied in previous papers. 5,6,8 No experimental data about these mixtures have been found in the literature, where only a few papers are available concerning vapor-liquid equilibrium studies.…”
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.
“…The excess molar enthalpy of branched or cyclic ethers with polar or nonpolar compound binary mixtures has been the subject of a great number of investigations − over the past few years. In contrast to the large body of binary ether mixtures studied, theoretical and experimental investigations are sparse for ternary mixtures formed by two alcohols and an ether.…”
Excess molar enthalpies for the (ethanol + 1-propanol + tetrahydropyran) and (ethanol + 1-propanol +
1,4-dioxane) ternary mixtures and their binaries (ethanol + tetrahydropyran) have been measured by a
flow microcalorimeter at 298.15 K and ambient pressure. The experimental results are correlated with
a polynomial equation. The results have been compared with those calculated from a UNIQUAC associated-solution model. This model considers the self-association of like alcohols, cross-association of unlike
alcohols, and solvation between alcohols and tetrahydropyran or 1,4-dioxane. The model with the
association constants, solvation constants, and binary information alone could satisfactorily represent
the ternary excess molar enthalpies.
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