Liquid-liquid equilibria for the acetonitrile + methanol + saturated hydrocarbon and acetonitrile + 1-butanol + saturated hydrocarbon systems

Tie-line results at 25°C and atmospheric pressure are presented for {(acetonitrile + methanol) + cyclohexane, or + n-hexane, or + n-heptane or + n-octane} and for {(acetonitrile + 1-butanol) + cyclohexane, or + n-hexane or + n-heptane}. Vapor-liquid equilibria for acetonitrile + methanol at 25° C are reported. The UNIQUAC associated-solution model is used to correlate binary vapor-liquid equilibria and mutual solubilities for the 13 systems constituting the ternary systems and to predict the ternary liquid-liquid equilibria by using binary parameters alone.     

Densities,refractive indices,and derived excess properties of the binary systems tert-butyl alcohol+toluene, +methylcyclohexane,and +isooctane and toluene+methylcyclohexane,and the ternary system tert-butyl alcohol+toluene+methylcyclohexane at 298.15 K

This paper reports experimental densities and refractive indices of the binary systems tert-butyl alcohol (TBA)+toluene, +isooctane, and +methylcyclohexane, and toluene+methylcyclohexane, and the ternary system TBA+toluene+methylcyclohexane, over the entire range of composition at 298.15 K. Excess molar volumes and changes of refractive indices were evaluated from the experimental data obtained. These derived properties were fitted to variable-degree polynomials. The experimental values of physical properties were compared with the values estimated by different methods of prediction.     

Determination of excess volumes in 1,2-dichloroethane + benzene, + toluene, + p-xylene, + cyclohexane,and + methylcyclohexane with a vibrating-tube densimeter

Densities of mixtures of 1,2-dichloroethane + benzene, + toluene, + p-xylene, + cyclohexane, and + methylcyclohexane were measured at 298.15 K over the whole concentration range by means of a vibrating-tube densimeter. Molar excess volumes were calculated from the results and compared to values obtained by interpolation or extrapolation of literature data.     

Quaternary liquid—liquid equilibrium for acetonitrile—cyclohexane—toluene—benzene

Liquid—liquid equilibrium data at 298.15 and 318.15 K are presented for the quaternary system, acetonitrile—cyclohexane—toluene—benzene. The experimental results are compared with those calculated by use of extended UNIQUAC equation with sufficient accuracy.     

Experimental investigation of the vapour–liquid equilibrium of binary and ternary mixtures containing dibutyl ether (DBE), cyclohexane and toluene at 313.15 K

New vapour–liquid equilibrium data for binary and ternary mixtures formed by dibutyl ether (DBE), toluene and cyclohexane at 313.15 K have been measured. A static method using an isothermal total pressure cell (Van Ness’ technique) has been employed. The systems studied presented a slight deviation from ideal behaviour. None of them show azeotrope. The VLE data have been satisfactorily correlated with the equations of Margules, Wilson, NRTL and UNIQUAC for binaries and Wohl expansion, Wilson, NRTL and UNIQUAC for the ternary system. Predictions with UNIFAC group contribution methods are included.     

Ternary Liquid-Liquid Equilibria Of (Acetonitrile + n-Octane + Propanols or Butanols)

Abstract

The liquid-liquid equilibria of (acetonitrile + n-octane + 1-propanol or 2-propanol or 1-butanol or 2-butanol, or iso-butanol or tert-butanol) at 298.15 K have been measured. The ternary experimental results agree well with those predicted from the UNIQUAC associated-solution model with binary parameters alone.     

Viscosities of the ternary mixture (cyclohexane+tetrahydrofuran+chlorocyclohexane) at 298.15 and 313.15 K

Viscosities of the ternary mixture (cyclohexane+tetrahydrofuran+chlorocyclohexane) and the binary mixtures (cyclohexane+tetrahydrofuran and cyclohexane+chlorocyclohexane) have been measured at normal pressure at the temperatures of 298.15 and 313.15 K. The viscosity data for the binary and ternary mixtures were fitted to a McAllister-type equation [R.A. McAllister, AIChE J. 6 (1960) 427–431]. Viscosity deviations for the binary and ternary mixtures were fitted to Redlich–Kister's and Cibulka's equations [I. Cibulka, Coll. Czech. Chem. Commun. 47 (1982) 1414–1419]. The group contribution method proposed by Wu [D.T. Wu, Fluid Phase Equilib. 30 (1986) 149–156] has been used to predict the viscosity of the binary and ternary systems.     

Thermodynamics of complex formation in ternary liquid mixtures containing acetonitrile

Vapor—liquid and liquid—liquid equilibria and excess enthalpies for ternary mixtures formed from acetonitrile, benzene, n-heptane, toluene, and carbon tetrachloride are successfully correlated with a modified version of the associated solution theory proposed by Lorimer and Jones in 1977, which assumes two types of self-association for acetonitrile and binary complexes between acetonitrile and unsaturated hydrocarbons and does not include any ternary parameters.     

Ternary liquid—liquid equilibria for acetonitrile—ethanol—cyclohexane and acetonitrile—2-propanol—cyclohexane

Liquid—liquid equilibrium data were obtained for two ternary systems: acetonitrile— ethanol—cyclohexane at 40°C, and acetonitrile—2-propanol—cyclohexane at 50°C. Binary vapor—Liquid equilibrium data were measured for acetonitrile—2-propanol at 50°C. The binary parameters of the Zeta and effective Zeta equations were evaluated from equilibrium data for binary pairs. The parameters obtained were used to predict the ternary liquid—liquid equilibrium data for six systems involving the present systems and the ternary vapor—liquid equilibrium data for one completely miscible system and two partially miscible systems without adding any ternary parameter. A heterogeneous area calculated by the Zeta equation is in general too large and does not decrease appreciably with increasing values of the third parameter ζ of the Zeta equation. However, the effective Zeta equation works much better than the original Zeta equation in data reduction.     

Excess Enthalpies of 2-Methyltetrahydrofuran + (2,2,4-Trimethylpentane or n-Heptane) + Methylcyclohexane at 25°C

Measurements of excess molar enthalpies at 25°C in a flow microcalorimeter, are reported for the two ternary mixtures 2-methyltetrahydrofuran + 2, 2, 4-trimethylpentane + methylcyclohexane and 2-methyltetrahydrofuran + n-heptane + methylcyclohexane. Smooth representations of the results are described and used to construct constant-enthalpy contours on Roozeboom diagrams. It is shown that useful estimates of the ternary enthalpies can be obtained from the Liebermann–Fried model using only the physical properties of the components and their binary mixtures.     

Quaternary liquid—liquid equilibrium. Cyclohexane—ethanol—benzene—acetonitrile

Nagata, I., 1986. Quaternary liquid—liquid equilibrium. Cyclohexane—ethanol—benzene—acetonitrile. Fluid Phase Equilibria, 26: 59–68.Experimental liquid—liquid equilibrium results are presented for the ternary acetonitrile—ethanol—cyclohexane and the quaternary cyclohexane—ethanol—benzene—acetonitrile systems at 25°C. The results agree well with the calculated values derived from the extended UNIQUAC equation (Nagata) with parameters from phase equilibrium data for the constituent binary mixtures or ternary tie-line data sets.     

DISQUAC predictions of excess enthalpies of the ternary mixture: tetrahydrofuran + cyclohexane + butanenitrile

Excess molar enthalpies of the ternary mixture: tetrahydrofuran + cyclohexane + butanenitrile and of the binary mixtures involved have been measured at 298.15 K by means of a flow microcalorimeter.The DISQUAC analysis is developed using interchange coefficients previously determined for the binary mixtures. Even neglecting ternary interactions, it is possible to obtain a satisfactory representation of the ternary system.     

Volumetric and acoustic properties of the ternary system (1-butanol+1,4-dioxane+cyclohexane)

Densities and speeds of sound for the ternary system 1-butanol+1,4-dioxane+cyclohexane have been measured at the temperatures of 298.15 and 313.15 K. Excess molar volumes and excess isentropic compressibilities have been calculated from experimental data and fitted by the Redlich-Kister equation for ternary mixtures. The ERAS model has been used to calculate excess molar volumes of the ternary mixture from parameters obtained from the constituent binary mixtures.     

Immersion enthalpy of benzene/cyclohexane and toluene/cyclohexane binary mixtures into modified activated carbons

Journal of Thermal Analysis and Calorimetry - The interaction between binary mixtures of benzene/cyclohexane and toluene/cyclohexane into three activated carbons with different physical and...     

Liquid–Liquid Equilibria of the Methanol + Toluene + Methylcyclohexane Ternary System at 278.15, 283.15, 288.15, 293.15, 298.15 and 303.15 K

Liquid–liquid equilibria of the methanol + toluene + methylcyclohexane ternary system at 278.15, 283.15, 288.15, 293.15, 298.15 and 303.15 K are reported. The effect of the temperature on liquid–liquid equilibrium is discussed. Data for the ternary system is available from the literature at T = 298 K. All chemicals were quantified by gas chromatography using a thermal conductivity detector. Experimental data for the ternary system are compared with values calculated by the NRTL and UNIQUAC equations. It is found that the UNIQUAC and NRTL models provide similar good correlations of the solubility curve at these six temperatures.     

Excess molar enthalpies of the ternary mixtures: (diisopropyl ether or 2-methyltetrahydrofuran) + cyclohexane + n-heptane at 298.15 K

Microcalorimetric measurements of excess molar enthalpies, at 298.15 K, are reported for the two ternary systems formed by mixing either diisopropyl ether or 2-methyltetrahydrofuran with binary mixtures of cyclohexane and n-heptane. Smooth representations of the results are presented and used to construct constant excess molar enthalpy contours on Roozeboom diagrams. It is shown that useful estimates of the ternary enthalpies can be obtained from the Liebermann and Fried model, using only the physical properties of the components and their binary mixtures.     

Prediction of vapor-liquid equilibrium from excess enthalpy data for binary ether +n-alkane or cyclohexane mixtures

Vapor liquid equilibrium (VLE) is successfully predicted from excess enthalpy H^E data for binary ether + n-alkane or cyclohexane mixtures. Parameters for the continuous linear association model (CLAM) and for the UNIQUAC Model for the excess Gibbs energy G^E were determined from H^E data measured at a low temperature (ambient temperature). These parameters are used to predict VLE data at low and high temperatures. The dependence of the accuracy of predictions on the set of H^E data chosen to evaluate the parameters and on the model for G^E are discussed.     

Ternary liquid—liquid equilibria and their representation by modified NRTL equations

Experimental liquid—liquid equilibrium data are reported for the systems acetonitrile—acetone—cyclohexane at 318.15 K and acetonitrile—methyl acetate—cyclohexane at 313.15 K. Two modified forms of the NRTL equation proposed by Renon are presented by substituting local surface fractions for local mole fractions and further by including Guggenheim's combinatorial entropy for athermal mixtures whose molecules differ in size and shape. The resultant equations involve three adjustable parameters and are extended to multicomponent systems without adding ternary (or higher) parameters. Calculated results of vapor—liquid and liquid—liquid equilibria for typical binary and ternary mixtures are presented.     

Liquid-liquid equilibria for four ternary systems containing methanol and cyclohexane

Nagata, I., 1984. Liquid-liquid equilibria for four ternary systems containing methanol and cyclohexane. Fluid Phase Equilibria, 18: 83–92.Liquid-liquid equilibria have been obtained experimentally for the systems methanol-benzene-cyclohexane, methanol-toluene-cyclohexane, methanol-acetone-cyclohexane and methanol-2-propanol-cyclohexane at 298.15 K. The experimental results are compared with predicted values obtained from the UNIQUAC and extended UNIQUAC equations.     

Excess enthalpies of 2-propanol + cyclohexane and 2-propanol + benzene + cyclohexane at 298.15 K

With an isothermal dilution calorimeter excess enthalpies have been determined at 298.15 K for 2-propanol + cyclohexane and 2-propanol + benzene + cyclohexane mixtures. The results are fitted with an associated-solution model. Predicted excess enthalpies for the ternary mixture agree well with the experimental results.