Molar Volumes Of Binary Mixtures Research Articles

Excess molar volumes of binary mixtures containing Dipropylene Glycol Monomethyl Ether with Water and 2-Methoxyethanol

Densities (ρ) at five temperatures, between 293.15 and 313.15 K, of binary mixtures of dipropylene glycol monomethyl ether + water and dipropylene glycol monomethyl ether + 2-methoxyethanol, are reported. The excess molar volumes (V E ) were calculated from these experimental data. The results are discussed in terms of intermolecular interactions.

Excess Molar Volumes for Binary Mixtures of 1-Alkanol and 1-Alkene. II. The System 1-Alkanol + 1-Octene at 15 and 35°C

Excess molar volumes, VE, are reported for binary mixtures of 1-hexanol with the homologous C6, C7, C8, and C10 1-alkenes at 25°C. In this series of mixtures, the VE values vary as a function of mole fraction from positive–negative “sigmoid” shaped curves exhibiting a very small positive lobe in the dilute alkanol region for the shortest chain 1-alkene to positive values over the whole concentration range for the longer chain 1-alkene. The partial molar excess volumes, ViE, were calculated for the components over the whole concentration range. The partial molar volume of 1-hexanol in the 1-hexene system shows a large and sharp minimum and in the 1-decene system is positive over the whole concentration range. The modified model [Treszczanowicz et al., J. Solution Chem.31, 455 (2002) originally proposed by Treszczanowicz and Benson Fluid Phase Equilibr.23, 117 (1985)] was used for the interpretation and prediction of the reported data. The model describes qualitatively the variation of VE with the length of the molecule and concentration as a result of superposition of the contributions of association, free volume, and nonspecific interactions.

Thermodynamic Study of Binary Mixtures Containing Glycols or Polyethylene Glycols + Benzyl Alcohol at 308.15 K

Excess molar enthalpies and excess molar volumes of binary mixtures containing ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, or poly(ethylene glycol)s (PEG200, PEG300, PEG400, and PEG600) + benzyl alcohol were determined at 308.15 K and at atmospheric pressure using a flow microcalorimeter and a digital density meter. Results were fitted to the Redlich−Kister polynomial to estimate the binary interaction parameters. The results are interpreted in terms of molecular interactions between the components.

Excess Molar Volumes and Partial Molar Volumes of Binary Mixtures Containing Diethylcarbonate with Benzene and Substituted Benzenes at 293.15 K

Densities of the binary mixtures of diethylcarbonate with benzene and substituted benzenes, namely toluene, bromobenzene, chlorobenzene and nitrobenzene have been measured as a function of the composition, at 293.15 K and atmospheric pressure using a bicapillary pycnometer with an accuracy of 4 parts in 104.The calculated excess molar volumes, V E were correlated with Redlich-Kister equation. The excess molar volumes are negative over the entire range of composition for the systems diethylcarbonate with benzene, toluene, bromobenzene and nitrobenzene. An inversion of the sign of V E is observed over some concentration for mixtures of diethylcarbonate with chlorobenzene. Partial molar volumes, Vi are also evaluated and their values have been extrapolated to zero concentration to obtain the limiting value at infinite dilution, Vo i . The numerical values of the excess molar volumes for binary mixtures decrease in the order: chlorobenzene > benzene > bromobenzene ≈ toluene > nitrobenzene. The results are explained in terms of dissociation of the self-associated solute molecules and the formation of aggregates between unlike molecules.

Application of the Prigogine-Flory-Patterson theory to excess molar volume of binary mixtures of acetonitrile with 1-alkanols

Excess molar volumes of binary mixtures of (acetonitrile + 1-heptanol or 1-octanol) as a function of composition under atmospheric pressure and at 293.15, 298.15 and 313.15 K have been used to test the applicability of the Prigogine-Flory-Patterson theory. Both systems exhibit positive V m E values over the whole mole fraction range in the temperature range studied. The agreement between theoretical and experimental results is satisfactory for the studied systems.

Excess molar volumes of binary mixtures of 2,2,2-trifluoroethanol with water, or acetone, or 1,4-difluorobenzene, or 4-fluorotoluene, or α,α,α, trifluorotoluene or 1-alcohols at a temperature of 298.15 K and pressure of 101 kPa

Excess molar volumes V m E of binary mixtures of 2,2,2-trifluoroethanol with water, or acetone, or methanol, or ethanol, or 1-alcholos, or 1,4-difluorobenzene, or 4-fluorotoluene or α,α,α-trifluorotoluene were measured in a vibrating tube densimeter at temperature 298.15 K and pressure of 101 kPa. The V m E extrema are: 1.540 cm 3 · mol −1 for (2,2,2-trifluoroethanol + 1-heptanol); 1.452 cm 3 · mol −1 for (2,2,2-trifluoroethanol + 1-hexanol); 1.238 cm 3 · mol −1 for (2,2,2-trifluoroethanol + 1-butanol); 0.821 cm 3 · mol −1 for (2,2,2-trifluoroethanol + 4-fluorotoluene); 0.817 cm 3 · mol −1 for (2,2,2-trifluoroethanol + ethanol); 0.647 cm 3 · mol −1 for (2,2,2-trifluoroethanol + methanol); 0.618 cm 3 · mol −1 for (2,2,2-trifluoroethanol + acetone); 0.605 cm 3 · mol −1 for (2,2,2-trifluoroethanol + α,α,α-trifluorotoluene); 0.485 cm 3 · mol −1 for (2,2,2-trifluoroethanol + 1,4-difluorobenzene); and −0.656 cm 3 · mol −1 for (2,2,2-trifluoroethanol + water). The limiting excess partial molar volumes are estimated.

Modeling of excess molar volume of binary mixtures of acetonitrile with amines using the prigogine-flory-patterson theory

In continuation of our work on excess molar volume V m E of non-electrolyte solutions containing acetonitrile, in this work experimental data of excess molar volume of binary mixtures of acetonitrile + (diethylamine or s-butylamine) as a function of composition under atmospheric pressure and at 288.15, 293.15, 298.15 and 303.15 K have been used to test the applicability of the Prigogine-Flory-Patterson theory. The V m E values are negative over the whole mole fraction range for all the mixtures studied. The agreement between theoretical and experimental results is satisfactory for the acetonitrile + s-butylamine system, whose V m E curves are symmetrical relative to mole fraction x = 0.5.

Studies of viscosity and excess molar volume of binary mixtures: 4. 1-Alkanol + tri- n-butylamine mixtures at 303.15 and 313.15 K

The excess molar volume V E, the viscosity deviation Δ η and the excess Gibbs energy of activation Δ G ∗E of viscous flow are calculated from density and viscosity measurements of six mixtures of 1-propanol, 1-butanol, 1-pentanol, 1-heptanol, 1-octanol and 1-decanol with tri- n-butylamine over the entire range of mole fractions at 303.15 and 313.15 K. The values of V E of all six systems are very large and negative. Except for 1-propanol+tri- n-butylamine, the magnitude of negative deviations in viscosity increases with chain length of alkanol. The results have been explained considering mixed associated species of type A i B involving alkanol (A) with tri- n-butylamine (B) through OH⋯N bonds. The viscosity data have been correlated with the equations of Grunberg and Nissan, Tamura and Kurata, Hind, McLaughlin and Ubbelohde, Katti and Chaudhri, McAllister, Heric, and of Auslaender.

Excess Gibbs energies and excess molar volumes for binary mixtures: (2-pyrrolidone + water), (2-pyrrolidone + methanol), and (2-pyrrolidone + ethanol) at the temperature 313.15 K

Total vapour pressures and excess molar volumes, measured at the temperature 313.15 K, are reported for three binary mixtures (2-pyrrolidone + water), (2-pyrrolidone + methanol) and (2-pyrrolidone + ethanol). The results are compared with previously obtained data for binary mixtures (amide + A), where amide= N-methylformamide, N, N-dimethylformamide and N-methylacetamide, and A= water, methanol, and ethanol.

Density and Partial Molar Volumes of Binary Mixtures for the Dimethyl Ether of a Glycol + Ethanol from T = 288.15 K to T = 318.15 K

AbstractDensities of {xCH3(OCH2CH2)vOCH3 + (1 ‐x)C2H5OH} for v = 1 − 4 at T = (288.15, 298.15, 308.15, and 318.15) K have been measured over the entire mole‐fraction range. The measurements were made by means of a vibrating‐tube densimeter. From these densities, some derived quantities, such as partial molar volumes and partial excess molar volumes have been obtained. Values of the limiting partial molar volumes and thence of the limiting partial excess molar volumes of the components have been derived. The densities can be expressed in terms of fourth‐degree polynomials with respect to the mole fraction of the glycol. The temperature has no significant effect on the partial molar volumes of the glycols with v = 3 and 4 in ethanol. These volumetric properties are discussed in terms of molecular interactions between the glycol and ethanol.

Viscosities, excess molar volume of binary mixtures of ethanolamine with water at 303.15, 308.15, 313.15 and 318.15 K

The density and viscosity values of binary mixtures of ethanolamine with water were measured at 303.15, 308.15, 313.15 and 318.15 K, using this data excess molar volume V E, viscosity deviation Δ η and excess Gibbs free energy of activation Δ G E∗ of viscous flow have been calculated. The results were fitted by Redlich–Kister equation. All mixtures show negative values of V E due to increased interactions between unlike molecules or very large differences in the molar volumes of pure components at relatively low temperature.

Excess molar volumes of binary mixtures of acetonitrile and chloroalkanes at 298.15 K and atmospheric pressure with application of the ERAS-Model

Densities for binary mixtures of acetonitrile with dichloromethane, trichloromethane and tetrachloromethane have been measured at 298.15 K and atmospheric pressure using a vibrating-tube densimeter. Excess molar volumes ( V m E) were determined. The systems exhibit negative V m E values over the entire composition range at the temperature studied. The experimental V m E results studied here have been used to test the extended real associated solution (ERAS)-Model.

Studies of viscosity and excess molar volume of binary mixtures of propane-1,2 diol with water at various temperatures

The excess molar volume V E, viscosity deviation Δ η and excess Gibbs free energy of activation Δ G ∗E of viscous flow have been investigated from the density and viscosity measurements of propane-1,2 diol (1)+water (2) over the entire range of mole fractions at 303.15, 308.15, 313.15 and 318.15 K. The results were fitted by Redlich–Kister equation. The system exhibited very large negative values of V E due to increased interactions between unlike molecules or very large differences in the molar volumes of pure components at low temperature.

Excess molar volume of binary mixtures of dehydrolinalool + alkanols at 308.15 K

Excess molar volume ( V E) of binary liquid mixtures of dehydrolinalool (DHL) with methanol, ethanol, n-propanol and n-butanol have been determined at 308.15 K from density measurements. The values of V E are negative in all the systems over the entire composition range. These results are correlated by the Redlich–Kister equation. The magnitude of negative values of V E marginally decrease with the increase of the chain length of the alkanol.

Excess molar volumes of binary mixtures of alkanols with ethyl acetate from 298.15 to 323.15 K

Excess molar volumes V E have been investigated from density ρ measurements using vibrating-tube digital densimeter DMA 60/602 for binary mixtures of methanol, 1-propanol, 2-propanol and 1-hexanol with ethyl acetate in the temperature range 298.15–323.15 K. Thermal expansion coefficients α and their excess values α E were evaluated. The results were analyzed and discussed in terms of dependence of V E on chain length of alkanol and position of hydroxyl group and effect of temperature.

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

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 standard deviations

Excess Molar Volumes of Binary Mixtures of Hexanol and Polyethers at 25°C

Excess molar volumes VmE at 25°C and atmospheric pressure over the entire composition range for binary mixtures of 1-hexanol with n-polyethers: 2,5-dioxahexane, 3,6-dioxaoctane, 2,5,8-trioxanonane, 3,6,9-trioxaundecane, 5,8,11-trioxapentadecane, 2,5,8,11-tetraoxadodecane, and 2,5,8,11,14-pentaoxapentadecane are reported from densities measured with a vibrating-tube densimeter. Systems containing 2,5-dioxahexane, 2,5,8-trioxanonane, 2,5,8,11-tetraoxadodecane or 2,5,8,11,14-pentaoxapentadecane are characterized by VmE > 0, probably due to predominant positive contributions to VmE from the disruption of H bonds of 1-hexanol and to physical interactions. In contrast, mixtures with 3,6-dioxaoctane, 3,6,9-trioxaundecane, and 5,8,11-trioxapentadecane are characterized by VmE < 0, indicating that the negative contribution to VmE from interstitial accommodation is more important.

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

Excess molar enthalpies, , and excess molar volumes, , of binary mixtures containing dimethyl carbonate (DMC), or diethyl carbonate (DEC) + α-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 and 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.

Excess Molar Enthalpies and Excess Molar Volumes of Binary Mixtures Containing Dialkyl Carbonates + Anisole or Phenetole at (288.15 and 313.15) K

Excess molar enthalpies, , and excess molar volumes, , of binary mixtures containing dimethyl carbonate or diethyl carbonate + anisole or + phenetole have been determined at (298.15 and 313.15) K and at atmospheric pressure. Standard deviations have been calculated from correlation of data by the Redlich−Kister polynomial. The calculated quantities have been qualitatively discussed in terms of thermodynamic interactions between the mixing components. Only a slight influence of temperature on the excess properties has been observed.

A Study of Excess Molar Enthalpies and Excess Molar Volumes of Binary Mixtures of 1-Chloropentane + 1-Alkanol (from 1-Butanol to 1-Octanol) at 25°C.

Excess molar enthalpies H E mand excess molar volumes V E m at 25°Cand normal atmospheric pressure for the binary mixtures 1-chloropentane + 1-alkanol(from 1-butanol to 1-octanol) have been determined using a Calvet microcalorimeterand from density measurements using a vibrating tube densimeter. The H E m valuesfor all the mixtures are positive and V E m values are positive or negative dependingon the mole fraction of the chloroalkane. Experimental H E m results are comparedwith the predictions of UNIFAC group-contribution models proposed by Dang andTassios and by Larsen et al., and are discussed in terms of molecular interactions.