Excess Molar Enthalpies and Excess Molar Volumes of Binary Mixtures Containing Dialkyl Carbonates + Pine Resins at (298.15 and 313.15) K

Abstract

Excess molar enthalpies, H m E , and excess molar volumes, V m E , of binary mixtures containing dimethyl carbonate (DMC), or diethyl carbonate (DEC) + R-pinene, + β-pinene, or + p-cymene have been determined using a flow microcalorimeter and a digital density meter at atmospheric pressure and at (298.15 and 313.15) K. All H m E and V m E data are positive and show symmetrical curves versus composition. The influence of temperature is marked for volumetric measurements while almost negligible for enthalpic data. Results have been correlated using the Redlich-Kister polynomial to estimate the binary interaction parameters. The calculated quantities have been qualitatively discussed in terms of thermodynamic interactions between the mixing compounds.

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

“…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.

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“…The tabulated standard deviations, σ(Q m E ), reported in Table 4 were defined as in previous papers. 5,6 McAllister's multibody interaction model, 17 widely used to correlate the kinematic viscosity ν of liquid mixtures with mole fraction, was applied to our data. We used the three-body model defined as and the four-body model given by where ν 12 , ν 21 , ν 1112 , ν 1122 , and ν 2221 are the model param- x 2 ln ν 12 + 3x 1 x 2 2 ln ν 21 + eters.…”

“…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.…”

“…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. ,, …”

“…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.…”