Binary Excess Molar Volumes Research Articles

Measurement and Correlation of the Excess Properties of Ternary Mixture of {x1[Hmim][BF4] + x21-Propanol + x32-Propanol} at Different Temperatures

In the present work, the density, ρ, and viscosity, η, of a binary mixture of {x11-propanol + x22-propanol}, along with a ternary mixture of {x11-hexyl-3- methylimidazolium tetrafluoroborate + x21-propanol ([Hmim][{BF4]) + x32-propanol} were measured over the entire composition range at (293.15 to 333.15) K and ambient pressure (p = 0.1 MPa). The excess molar volume, VmE, and viscosity deviation, Δη, were calculated from the measured values of density and viscosity. The excess molar volumes of ternary mixtures are negative over the entire mole fraction range and their magnitudes increase with increasing temperature. Viscosity deviations for the ternary mixture are negative over the entire mole fraction range and decrease with increasing temperature. The Cibulka and Redlich–Kister equations were used to correlate the ternary and binary excess molar volumes, respectively.

Liquid–liquid equilibria for aqueous sulfuric acid solutions with undecane, dodecane, or 1-dodecanol, trioctylamine or tributyl phosphate and excess and deviation properties for sub-binary systems at 298.15 K

The psuedo ternary LLE data are reported for the following systems at 298.15K: an aqueous sulfuric acid solution (ASS)+dodecane+tributylphosphate (TBP); an ASS+1-dodecanol+TBP; an ASS+undecane+TBP; an ASS+dodecane+trioctylamine (TOA); an ASS+1-dodecanol+TOA and an ASS+undecane+TOA. These experimental LLE data were correlated well with the non-random two-liquid (NRTL) GE model. In addition, the density (ρ) and the refractive index (nD) for the systems {TBP+dodecane}, {TBP+1-dodecanol}, {TBP+undecane}, {TOA+dodecane}, {TOA+1-dodecanol} and {TOA+undecane} at 298.15K were determined. These data were used to calculate the binary excess molar volumes (VE) and the deviations of the refractive indices (ΔR) over the entire composition range. The experimental data were satisfactorily fitted using the Redlich–Kister polynomial.

Densities and viscosities of binary mixtures of ethylmethylketone and 2-alkanols; application of the ERAS model and cubic EOS

Densities and viscosities of binary mixtures of ethylmethylketone with 2-propanol, 2-butanol, 2-pentanol, 2-hexanol, and 2-heptanol, have been measured as a function of composition range at temperatures of 298.15K, 303.15K, 308.15K, 313.15K and ambient pressure. Excess molar volumes VmE and viscosity deviations Δη were calculated and correlated by the Redlich–Kister equation to derive the adjustable parameters and estimate the standard error. For mixtures of ethylmethylketone with used 2-alkanols, VmE is positive and Δη is negative over the entire range of mole fraction. The ERAS-model has been applied for describing the binary excess molar volumes and also Peng–Robinson–Stryjek–Vera (PRSV) equation of state (EOS) has been used to predict the binary excess molar volumes and viscosities.

Thermodynamic properties of binary mixtures containing dimethyl carbonate+2-alkanol: Experimental data, correlation and prediction by ERAS model and cubic EOS

Densities and viscosities for binary mixtures of dimethyl carbonate with 2-propanol up to 2-heptanol were measured at various temperatures and ambient pressure. From experimental data, excess molar volumes, VmE. were calculated and correlated by the Redlich–Kister equation to obtain the binary coefficients and the standard deviations. Excess molar volumes, VmE, are positive for all studied mixtures over the entire range of the mole fraction. The ERAS-model has been applied for describing the binary excess molar volumes and also Peng–Robinson–Stryjek–Vera (PRSV) equation of state (EOS) has been used to predict the binary excess molar volumes and viscosities. Also several semi-empirical models were used to correlate the viscosity of binary mixtures.

Excess molar volumes of 1,3 propanediol + (C1-C5) alkan-1-ols: Application of cubic EOS

Densities of the binary mixtures consist of methanol, ethanol, 1- propanol, 1-butanol and 1-pentanol with 1,3 Propanediol were measured at temperatures (293.15, 298.15, 303.15 and 313.15) K and atmospheric pressure. Measurements have been made over the full range of compositions and for the pure compounds by using a vibrating tube densimeter. Excess molar volumes have been obtained from these experimental results and were fitted to a Redlich-Kister type expansion. The results were interpreted in terms of molecular interactions and structural factors of the alcohols. It was observed that an increase of the alcohol carbon chain length led to lower interactions on mixing. The Peng-Robinson-Stryjek-Vera (PRSV) equation of state has been used to correlate the binary excess molar volumes.

Excess molar volumes of diisopropylamine + (C 1–C 5) alkan-1-ols: Application of the ERAS model and cubic EOS

Densities of the binary mixtures consist of methanol, ethanol, 1-propanol, 1-butanol and 1-pentanol with diisopropylamine were measured at temperatures (293.15, 298.15, 303.15 and 313.15) K and atmospheric pressure. Data were used to calculate the excess molar volumes. All the excess molar volumes are large and negative over the whole range of mole fraction, indicating strong interactions between unlike molecules. The ERAS-model has been applied for describing the binary excess molar volumes. The ERAS parameters confirm that the strong interactions between unlike molecules are encountered in mixtures. Also the Peng–Robinson–Stryjek–Vera (PRSV) equation of state has been used to predict the binary excess molar volumes.

Liquid Densities and Excess Molar Volumes for Binary Systems (Ionic Liquids + Methanol or Water) at 298.15, 303.15 and 313.15 K, and at Atmospheric Pressure

Binary excess molar volumes, VmE, have been evaluated from density measurements, using a vibrating tube densimeter over the entire composition range for binary liquid mixtures of ionic liquids 1-ethyl-3-methyl-imidazolium diethyleneglycol monomethylethersulphate [EMIM]+[CH3(OCH2CH2)2OSO3]− or 1-butyl-3-methyl-imidazolium diethyleneglycol monomethylethersulphate [BMIM]+[CH3(OCH2CH2)2OSO3]− or 1-methyl-3-octyl-imidazolium diethyleneglycol monomethylethersulphate [MOIM]+[CH3(OCH2CH2)2OSO3]−+methanol and [EMIM]+[CH3(OCH2CH2)2OSO3]−+water at 298.15, 303.15 and 313.15 K. The VmE values were found to be negative for all systems studied. The VmE results are explained in terms of intermolecular interactions and packing effects. The experimental data were fitted by the Redlich-Kister polynomial.

Volumetric properties and viscosities of the methyl butanoate + heptane + 1-octanol ternary system and its binary constituents in the temperature range from 283.15 to 313.15 K

Densities and kinematic viscosities for the (heptane or methyl butanoate) + 1-octanol binary systems were determined throughout the whole composition range at the temperatures of 283.15, 293.15, 303.15 and 313.15 K under atmospheric pressure. The same properties were also determined for the ternary system methyl butanoate + heptane + 1-octanol at 283.15 and 313.15 K. The binary excess molar volumes were used for the calculation by analytical differentiation of other mixing quantities such as the isobaric thermal expansion coefficients, the temperature coefficients of the molar excess volume and the pressure coefficients of the molar excess enthalpy. The values of the volumetric properties obtained for both binary and ternary systems were compared against those obtained applying the group-contribution molecular model of Nitta et al., using parameter sets already available in the literature. The feasibility of several specific equations to correlate composition–viscosity data from binary and ternary systems was tested. Viscosity values were compared, as well, with those predicted by the group-contribution models UNIFAC-VISCO and UNIVAC. Finally, results from several empirical and semiempirical models for predicting ternary properties from only its binary subsystems results were compared to both the experimental excess volumes and viscosity deviations of the ternary systems.

Application of the Prigogine-Flory-Patterson and extended real associated solution methods to excess molar volumes of pyridine base with n-alkane mixtures

The binary excess molar volumes, V E, of γ-picoline- n-alkane mixtures were measured at 25°C. The Prigogine-Flory-Patterson and extended real associated solution models have been fitted to the experimental results.