Van Laar Equation Research Articles

Isothermal vapour-liquid equilibria for ternary and quaternary systems of butyl chlorides with nheptane, toluene and methylcyclohexane at 323.15 K

Isothermal P, x and y data were measured in ternary and quaternary systems containing one of butyl chlorides (1-chlorobutane, 2-chlorobutane, 2-chloro-2-methylpropane) with n-heptane, toluene and methylcyclohexane. The data were smoothed by means of the maximum likelihood method using 3-suffix Margules, Van Laar, Wilson, NRTL (α = 1) and UNIQUAC equations. The DISQUAC model was applied to the prediction of data for ternary and quaternary systems.

Isobaric vapour-liquid equilibrium for the binary systems of 2-butanol with some halohydrocarbons at 40.0 and 101.3 kPa

Isobaric vapour-liquid equilibrium at 40.0 and 101.3 kPa is reported for the binary systems 2-butanol with chlorocyclohexane, chlorobenzene, bromocyclohexane and bromobenzene. Some of the studied systems show minimum temperature azeotropes. The VLE results were thermodynamically consistent and correlated with the Margules, van Laar, Wilson, NRTL and UNIQUAC equations. Predictions with the UNIFAC and ASOG methods were also made.

Vapour-liquid equilibrium for the binary systems of 2-methyl-1-propanol with some halohydrocarbons at 40.0 and 101.3 kPa

A dynamic recirculating still was employed to measure isobaric vapour-liquid equilibrium at 40.0 and 101.3 kPa for the binary systems 2-methyl-1-propanol with some halohydrocarbons (chlorocyclohexane, chlorobenzene, bromocyclohexane and bromobenzene). Some of the studied systems show minimum temperature azeotropes. The experimental data were tested for thermodynamic consistency and satisfactorily correlated with the Margules, van Laar, Wilson, NRTL and UNIQUAC equations. Predictions with UNIFAC and ASOG methods were also obtained.

Isobaric vapor-liquid equilibrium of binary mixtures of 1-propanol + chlorobenzene and 2-propanol + chlorobenzene

Isobaric vapor-liquid equilibria were obtained for the system 1-propanol + chlorobenzene at 20 and 100 kPa and for the system 2-propanol + chlorobenzene at 100 kPa using a dynamic still. The experimental error in temperature was ±0.1 K, in pressure ±0.01 kPa and ±0.1 kPa for the experiments carried out at 20 and 100 kPa, respectively, and in the liquid and vapor mole fraction 0.001. The two systems satisfy the point-to-point thermodynamic consistency test. Both systems show a positive deviation from ideality. The data were well correlated with the Margules, Van Laar, Wilson, NRTL and UNIQUAC equations.

Vapor−Liquid Equilibria for the Binary Systems of 1-Butanol with Some Halohydrocarbons at 40.0 and 101.3 kPa

Isobaric vapor−liquid equilibrium measurements at 40.0 and 101.3 kPa are reported for 1-butanol + chlorocyclohexane, + chlorobenzene, + bromocyclohexane, + bromobenzene. Some of the studied systems show minimum temperature azeotropes. The experimental data were tested for thermodynamic consistency and satisfactorily correlated with the Margules, Van Laar, Wilson, NRTL, and UNIQUAC equations. Predictions with the UNIFAC method and ASOG method were also obtained.

Isobaric VLE Data of the Ternary System (1-Butanol+n-Hexane+1-Butylamine) and the Three Constituent Binary Mixtures at 101.3kPa.

The isobaric vapour-liquid equilibrium has been experimentally studied for the ternary mixture (1-butanol + n-hexane + 1-butylamine) and for the binary mixtures (1-butanol + n-hexane), (1-butanol + 1-butylamine), and (n-hexane + 1-butylamine) at 101.3 kPa. The activity coefficients were found to be thermodynamically consistent and they 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.

Isobaric Vapor−Liquid Equilibrium Measurements on 2-Chlorobutane + Isomeric Butanols at 60.0 and 101.3 kPa

Isobaric vapor-liquid equilibrium measurements are reported for 2-chlorobutane + 1-butanol, + 2-butanol, + 2-methyl-1-propanol, and + 2-methyl-2-propanol. The activity coefficients were found to be thermodynamically consistent. They were well correlated with the Margules, Van Laar, Wilson, NRTL, and UNIQUAC equations

Isobaric Vapor−Liquid Equilibria at 6.67 kPa for 1-Octene + 2-Butyl Propenoate

Isobaric vapor−liquid equilibria for the 1-octene + 2-butyl propenoate system have been determined at 6.67 kPa in a small-capacity recirculating still. Results were found to be thermodynamically consistent, and they were satisfactorily correlated with the van Laar, Wilson, and UNIQUAC equations.

Isobaric Vapor−Liquid Equilibria at 6.67 kPa for 1-Octene + Propenoic Acid and 2-Butyl Propenoate + Propenoic Acid

Isobaric vapor−liquid equilibria for both 1-octene + propenoic acid and 2-butyl propenoate + propenoic acid systems have been determined at 6.67 kPa in a small-capacity recirculating still. Results were found to be thermodynamically consistent by using the L−W method of Wisniak and they were satisfactorily correlated with the van Laar, Wilson, and UNIQUAC equations, considering propenoic acid as an associating compound in both liquid and vapor phases.

Isobaric vapour‐liquid equilibrium for the binary mixtures of 1‐bromobutane with isomeric butanols at 40.0 and 101.3 kpa

AbstractA dynamic recirculating still was employed to measure isobaric vapour‐liquid equilibrium at 40.0 and 101.3 kPa for the binary systems 1‐bromobutane and each of the isomers of butanol. All mixtures show azeotropes at both pressures. The experimental VLE data are thermodynamically consistent and were correlated using Margules, Van Laar, Wilson, NRTL and UNIQUAC equations.

Isobaric VLE data for the binary systems 1,4-dichlorobutane with isomeric butanols at 40.0 and 101.3 kPa

Isobaric vapour-liquid equilibrium data at 40.0 and 101.3 kPa for the binary systems 1,4-dichlorobutane with 1-butanol, 2-butanol, 2-methyl-1-propanol and 2-methyl-2-propanol are reported. The systems 1,4-dichlorobutane + 1-butanol or 2-methyl-1-propanol at 40.0 kPa show azeotropes. The VLE data are thermodynamically consistent, and the activity coefficients were satisfactorily correlated with the Margules, Van Laar, Wilson, nrtl and uniquac equations.

Isobaric VLE data for the binary systems dibromomethane with isomeric butanols at 40.0 and 101.3 kPa

Isobaric vapour-liquid equilibrium data at 40.0 and 101.3 kPa for the binary systems dibromomethane with 1-butanol, 2-butanol, 2-methyl-1-propanol and 2-methyl-2-propanol are reported. All the systems show minimum temperature azeotropes. The experimental data were tested for thermodynamic consistency and correlated with the Margules, Van Laar, Wilson, NRTL and UNIQUAC equations. Predictions with the UNIFAC method were also obtained.

Vapor-Liquid Equilibria in the Ternary System 2-Chlorobutane + 1-Chlorobutane + Cyclohexane and Its Binaries

Vapor-liquid equilibrium at 101.3 kPa has been determined for the ternary system 2-chlorobutane + 1-chiorobutane + cyclohexane and its binaries 2-chlorobutane + cyclohexane and 1-chiorobutane + cyclohexane. The binary system 1-chiorobutane + cyclohexane presents an azeotropic point at 76.86°C that contains 57.5%mol 1-chlorobutane. No ternary azeotrope is present. The data were correlated by the Redlich-Kister, Van Laar, Wilson and Wisniak-Tamir equations and the appropriate parameters are reported. The activity coefficients of the ternary system can be predicted from those of the pertinent binary systems.

Isobaric VLE Data for the Binary Systems 1,3-Dichloropropane with Isomeric Butanols

Abstract Isobaric vapour-liquid equilibrium data at 40.0 and 101.3 kPa for the binary systems 1,3-dichloropropane with 1-butanol, 2-butanol, 2-methyl-1-propanol and 2-methyl-2-propanol are reported. Some of the studied systems present azeotropes. The activity coefficients were found to be thermodynamically consist-ent, and they were satisfactorily correlated with the Margules, Van Laar, Wilson, NRTL and UNIQUAC equations.

Experimental and Predicted Isobaric Vapour-Liquid Equilibrium for the Binary Systems 1,2-Dibromoethane with Isomeric Butanols.

A dynamic recirculating still was employed to measure isobaric vapour-liquid equilibrium at 40.0 and 101.3 kPa for the binary systems 1,2-dibromoethane with 1-butanol, 2-butanol, 2-methyl-l-propanol and 2-methyl-2-propanol. The experimental data were tested for thermodynamic consistency and correlated with the Margules, Van Laar, Wilson, NRTL and UNIQUAC equations. All the systems show minimum temperature azeotropes, except 1,2-dibromoethane with 2-methyl-2-propanot at 101.3 kPa. Predictions with the UNIFAC method were also obtained.

Isobaric Vapor-Liquid Equilibria in the Binary Systems of 1-Bromopropane with Cyclohexane, Heptane, and 1-Butanol

Vapor-liquid equilibrium at 101.3 kPa has been determined for the binary systems of 1-bromopropane with cyclohexane, heptane, and 1-butanol. The three systems exhibit positive deviations from ideal behavior. The activity coefficients and boiling point of the solution were correlated with its composition by the Redlich-Kister, Van Laar, and Wisniak-Tamir equations

Vapor-Liquid Equilibria for Systems of 1-Butanol with 2-Methyl-1-butanol, 3-Methyl-1-butanol, 2-Methyl-2-butanol, and 3-Methyl-2-butanol at 30 and 100 kPa

Vapor-liquid equilibrium data were measured for binary systems of 1-butanol with 2-methyl-1-butanol, 3-methyl-1-butanol, 2-methyl-2-butanol, and 3-methyl-2-butanol at 30 and 100 kPa. The experimental data obtained in this work are thermodynamically consistent according to a point-to-point consistency test, and deviation from ideal behavior is small in all cases. They can be equally well correlated with the Margules, Van Laar, Wilson, NRTL, and UNIQUAC equations.

Vapor-liquid equilibria of coal-derived liquids. 3. Binary systems with tetralin at 200 mm mercury

Isobaric vapor-liquid equilibrium data are reported for binary systems of tetralin with p-xylene, [gamma]-picoline, piperidine, and pyridine; all systems were measured at 26.66 kPa (200 mmHg) with a recirculation still. Liquid-phase activity coefficients were correlated using the Van Laar, Wilson, NRTL, and UNIQUAC equations. Vapor-phase nonidealities were found negligible under the experimental conditions of this work, and deviations of the liquid phase from the ideal behavior, as described by Raoult's law, were found to be slightly positive for all the systems.

Isobaric vapor-liquid equilibria of p-xylene + o-xylene and m-xylene + o-xylene systems at 6.66 and 26.66 kPa

Vapor-liquid equilibrium data were obtained for systems of o-xylene with p- and m-xylenes at 6.66 and 26.66 kPa. The activity coefficients were found to be thermodynamically consistent. They were equally well correlated with the Margules, Van Laar, Wilson, NRTL, and UNIQUAC equations. The parameters of these equations are given.

Isobaric vapor-liquid equilibria of ethylbenzene + m-xylene and ethylbenzene + o-xylene systems at 6.66 and 26.66 kPa

Vapor-liquid equilibrium data were obtained for systems of ethylbenzene with m- and o-xylenes at 6.66 and 26.66 kPa. The activity coefficients were found to be thermodynamically consistent. They were equally well correlated with the Margules, Van Laar, Wilson, NRTL, and UNIQUAC equations. The parameters of these equations are given.