Magdalena Domínguez

Viscosities of the ternary mixture (2-butanol+n-hexane+1-butylamine) at 298.15 and 313.15 K

Abstract Viscosities of the ternary mixture (2-butanol+ n -hexane+1-butylamine) and of the binary mixtures (2-butanol+ n -hexane) at 298.15 and 313.15 K, and (2-butanol+1-butylamine) at 313.15 K have been measured at atmospheric pressure. Viscosity deviations and excess Gibbs energy of activation of viscous flow for the binary and ternary systems were fitted to Redlich–Kisters and Cibulkas equations, respectively. To correlate experimental data of ternary system from binary ones, different empirical and semiempirical equations have been used (Nissan and Grunberg, Hind, Frenkel, McAllister, Katti and Chaudhri, Heric and Iulan) and their parameters have been calculated. The “viscosity-thermodynamic” model (UNIMOD) has been applied to correlate experimental data for the binary mixtures and to predict the viscosity for the ternary system. The Group Contribution-Thermodynamic Viscosity model (GC-UNIMOD), and the group contribution method proposed by Wu have been employed to predict the viscosity for the binary and ternary systems.

Thermodynamic properties of the mixture benzene + cyclohexane + 2-methyl-2-butanol at the temperature 298.15 K: excess molar volumes prediction by application of cubic equations of state

Abstract Excess molar volumes, changes of refractive indices, and changes of isentropic compressibilities of the ternary mixture benzene (1)+cyclohexane (2)+2-methyl-2-butanol (3), and the corresponding binary mixtures benzene (1)+2-methyl-2-butanol (3), and cyclohexane (2)+2-methyl-2-butanol (3) have been evaluated from density, refractive index, and speed of sound measurements at 298.15 K, and atmosphere. These derived properties of binary, and ternary mixtures were fitted to Redlich–Kister, and Nagata equations, respectively, the correlation parameters being gathered. In spite of the high non-ideality observed, the excess molar volumes were satisfactorily predicted by means of cubic equations of state with simple mixing rules.

Thermodynamic behaviour of mixtures containing methyl acetate, methanol, and 1-butanol at 298.15 K: application of the ERAS model

Abstract Excess molar volumes, and changes of refractive indices, of the ternary mixture methyl acetate+methanol+1-butanol, and the binary mixtures methyl acetate+1-butanol, and methanol+1-butanol have been evaluated from density, and refractive indices measurements at 298.15 K, and 1 atm. These derived properties of binary, and ternary mixtures were fitted to Redlich–Kister, and Cibulka type equations, respectively. The ERAS model interaction parameters of the binary systems contained in the ternary mixture were computed, the obtained results showing good accuracy. The high polar/associative behaviour of the mixtures should be the cause of high deviations in ternary excess prediction. The obtained results suggest the convenience of extending the model to multicomponent polar/associative mixtures in order to take into account all binary polar effects, and higher order polar effects in the mixtures.

Viscosities of the ternary mixture (1-butanol + n-hexane + 1-butylamine) at the temperatures 298.15 and 313.15 K

Abstract Viscosities of the ternary mixture {1-butanol + n -hexane + 1-butylamine} and the binary mixtures {1-butanol + n -hexane}, {1-butanol + 1-butylamine} and { n -hexane + 1-butylamine} have been measured at 298.15 and 313.15 K. Viscosity deviations for the binary and ternary systems were fitted to Redlich-Kisters and Cibulkas equations, respectively. The “viscosity-thermodynamic” model (UNIMOD) has been used to correlate experimental data for the binary mixtures and to predict the viscosities for the ternary system. The Group-Contribution Thermodynamic-Viscosity model (GC-UNIMOD), and the group contribution method proposed by Wu have been used to predict the viscosity of the binary and ternary systems.

Speed of sound and isentropic compressibility of the ternary mixture (2-Butanol + n-Hexane + 1-Butylamine) and the constituent binary mixtures at 298.15 K and 313.15 K

Abstract Densities and speeds of sound for (2-Butanol + n -Hexane + 1-Butylamine) at 298.15K and 313.15 K, and the constituent binary mixtures (2-Butanol + n -Hexane), (2-Butanol + 1-Butylamine) at 298.15 K and 313.15 K, and ( n -Hexane + 1-Butylamine), at 313.15 K have been measured. The isentropic compressibilities, the excess isentropic compressibilities, and the speeds of sound deviations have been calculated for both the binary and the ternary systems, from the experimental data. The isentropic compressibilities have been compared with calculated values from the Free Length Theory (FLT) and Collision Factor Theory (CFT).

Mixing Properties of the Binary Mixtures of Acetone, Methanol, Ethanol, and 2-Butanone at 298.15 K

Abstract Speeds of sound, densities and refractive indices of the binary mixtures containing acetone, methanol, ethanol, or 2-butanone have been measured at 298.15 K and atmospheric pressure, in the whole composition diagram, the derived excess values being determined. Parameters of analytical expressions which represent the composition dependences of excess and variation of properties are reported. Values of physical properties were compared with the results obtained by different prediction methods. The excess volumes were estimated using different applications of the Heller equation, which are depending on the refractive indices of the mixtures. A good agreement between the experimental and theoretical values both in magnitude and sign were obtained by these methods.

Densities, speeds of sound and isentropic compressibilities of binary and ternary mixtures containing benzene, cyclohexane and hexane at 298.15 K

Abstract Densities, ϱ, and speeds of sound, u , have been measured for the ternary mixture {benzene + cyclohexane + hexane} and the corresponding binary mixtures {benzene + cyclohexane}, {benzene + hexane} and {cyclohexane + hexane}, at the temperature 298.15 K. Using these results, the isentropic compressibilities, κ s , the excess isentropic compressibilities, κ s E , and the speeds of sound deviations, Δu , have been calculated for both the binary mixtures and the ternary system. Excess isentropic compressibilities, κ s E , and the speeds of sound deviations, Δu , have been fitted to the Redlich-Kister equation in the case of binary mixtures, while the equation of Cibulka was used to fit the values relating to the ternary system. The empiric equations of Redlich-Kister, Tsao-Smith, Kohler and Colinet have been applied in order to predict the κ s E and Δu of ternary mixtures from the binary contributions.

Densities and excess molar volumes of the ternary mixture (1-butanol+n-hexane+1-chlorobutane) at 298.15 and 313.15 K. Application of the ERAS model

Abstract Densities of the liquid mixtures (n-hexane+1-chlorobutane) and (1-butanol+n-hexane+1-chlorobutane) have been measured by the vibrating tube technique at 298.15 K and 313.15 K. With these densities, excess molar volumes were calculated. An extended version of the so-called ERAS model has been used for describing VE of the complete ternary system at 298.15 K. Qualitatively the ERAS-model gives an adequate representation of this system, being similar the shapes of both the experimental and the predicted curves.

Mixing properties of benzene+2-methyl-2-butanol+1-pentanol at 298.15 K. Experimental results and comparison between ERAS model and cubic EOS estimations for excess molar volumes

Abstract Excess molar volumes, changes of refractive indices, and changes of isentropic compressibilities of the ternary mixture benzene+2-methyl-2-butanol+1-pentanol, and the binary subsystem 2-methyl-2-butanol+1-pentanol have been calculated from density, refractive index, and speed of sound measurements at 298.15 K and atmospheric pressure. The Redlich–Kister and the Cibulka equation were used for correlating binary and ternary properties, respectively. ERAS model interaction parameters of the binary systems concerned were computed. A good representation of the behaviour of the property is obtained. The Soave–Redlich–Kwong and the Peng–Robinson equations of state were applied, in combination with simple mixing rules. Binary parameters were calculated from experimental excess molar volumes, and used to predict the ternary property, yielding lower deviations.

Isobaric VLE data of the binary mixture (n-hexane+1-chlorobutane) and the ternary system (1-butanol+n-hexane+1-chlorobutane) at 101.3 kPa

Abstract Isobaric vapour–liquid equilibrium (VLE) for the ternary mixture, 1-butanol (1)+ n -hexane (2)+1-chlorobutane (3) and for the binary mixture, n -hexane (1)+1-chlorobutane (2) at 101.3 kPa has been experimentally studied. The activity coefficients were found to be thermodynamically consistent and were satisfactorily correlated with the Margules, van Laar, Wilson, NRTL and UNIQUAC equations. They have been also compared with the results obtained from the application of ASOG and the modified UNIFAC group contribution methods.