scholarly journals Estimation of Excess Properties of Binary Liquids Systems of Tetrahydrofurfuryl Alcohol with Short-Chain Carboxylic Acids at 298.15 K

2019 ◽  
Vol 31 (4) ◽  
pp. 820-824
Author(s):  
Husam S. Khalaf ◽  
Zainab A.H. Al-Dulaimy ◽  
Ahmed M. Abbas ◽  
Maida H. Saleem
Keyword(s):  
Carboxylic Acids ◽  
Excess Molar Volumes ◽  
Dipolar Interaction ◽  
Liquid Mixtures ◽  
Excess Properties ◽  
Molar Gibbs Free Energy ◽  
Viscosity Deviations ◽  
Liquid Systems ◽  
The Difference ◽  
Kister Equation

At the temperature 298.15 K, some physical properties such as: refractive indices (nD), viscosities (η) and densities (ρ) were studied in four liquid-liquid mixtures: carboxylic acids (HCOOH, CH3COOH, CH3CH2COOH and CH3CH2CH2COOH) with tetrahydrofurfuryl alcohol (THFA) with the identified configuration set. These empirical data were utilized to estimate the excess molar volumes (Vm E), refractive index perversions (ΔR), viscosity deviations (ηE) and excess molar Gibbs free energy (ΔG*E). Values of Vm E, ηE , ΔG*E and ΔR were plotted versus mole fraction of tetrahydrofurfuryl alcohol. In all cases, the values of Vm E, ηE , ΔG*E and ΔR that obtained in this study were found to be negative at 298.15 K. The excess parameters were applied in the Redlich-Kister equation by utilizing multi-parameter coefficients that concluded binary coefficients and in respect to the standard deviation. The difference of these characteristics with the formation of binary liquid systems indicates the absence of bipolar bond, variation in the shape and size of component molecules, hydrogen bonding and dipolar interaction among unlike molecules.

scholarly journals Vapor pressure, density, viscosity and refractive index of dimethyl sulfoxide + 1,4-dimethylbenzene system

2008 ◽  
Vol 73 (1) ◽  
pp. 73-85 ◽  
Author(s):  
Oana Ciocirlan ◽  
Olga Iulian
Keyword(s):  
Dimethyl Sulfoxide ◽  
Excess Molar Volumes ◽  
Excess Properties ◽  
Refractive Indices ◽  
Excess Functions ◽  
Liquid Equilibrium ◽  
Viscosity Deviations ◽  
Unifac Model ◽  
Equilibrium Data ◽  
Kister Equation

This paper reports the experimental results of isothermal vapor-liquid equilibrium data between 303.15 and 333.15 K, and densities, viscosities, refractive indices from 298.15 to 323.15 K of the dimethyl sulfoxide + 1,4-dime?thylbenzene system over the entire range of mixture composition. The obtained PTX data were correlated by the Wilson and NRTL models and estimated by the UNIFAC model. The excess Gibbs energy and activity coefficients were calculated and compared with others excess properties. Excess molar volumes, viscosity deviations and deviations in refractivity were calculated from the experimental data; all the computed quantities were fitted to the Redlich-Kister equation. The resulting excess functions were interpreted in terms of structure and interactions.

scholarly journals Dielectric properties of liquid systems: study of interactions in the systems carbon tetrachloride with benzene, toluene, and p-xylene

2014 ◽  
Author(s):  
Adrian Buep
Keyword(s):  
Dielectric Properties ◽  
Carbon Tetrachloride ◽  
Dipole Moments ◽  
Excess Molar Volumes ◽  
Polar Compounds ◽  
Excess Properties ◽  
Static Permittivity ◽  
Liquid Systems ◽  
Benzene Toluene ◽  
Kister Equation

Abstract Intermolecular associations in liquid systems of non-polar and slightly polar compounds were studied through excess molar volumes (VME), and excess dielectric properties (εE and nD2E) for mixtures of carbon tetrachloride (CCl4) with benzene (C6H6), toluene (C6H5CH3), and p-xylene (p−(CH3)2C6H4). These excess properties were calculated from measurements of density (ρ), static permittivity (ε), and refractive index (nD) over the whole range of concentrations, at 298.15 K. The values of the excess dielectric properties for these mixtures were fitted in two different ways, one through least squares using the Redlich–Kister equation and the other using a model developed to explain deviations from ideality. The first fit was found to be descriptive while the second gave the equilibrium constant values for the interaction products actually formed in the mixtures and the respective electronic polarizabilities and dipole moments, indicating the existence of interaction products.

scholarly journals Density, viscosity and refractive index of the dimethyl sulfoxide + o-xylene system

2009 ◽  
Vol 74 (3) ◽  
pp. 317-329 ◽  
Author(s):  
Oana Ciocirlan ◽  
Olga Iulian
Keyword(s):  
Experimental Data ◽  
Viscous Flow ◽  
Dimethyl Sulfoxide ◽  
Excess Molar Volumes ◽  
Excess Properties ◽  
Viscosity Data ◽  
Excess Functions ◽  
Viscosity Deviations ◽  
Semi Empirical ◽  
Kister Equation

This work reports the experimental results of the densities, viscosities and refractive indices between 298.15 and 323.15 K of the dimethyl sulfoxide + o-xylene system over the entire composition range of the mixtures. The excess molar volumes (VE), viscosity deviations (?v), excess Gibbs energy of activation of viscous flow (G*E) and deviations in the refraction (?R) were calculated from the experimental data; all the computed quantities were fitted to the Redlich-Kister equation. The system exhibits moderate negative values for the investigated excess properties. The resulting excess functions were interpreted in structural and interactional terms. From the experimental data, the thermodynamic functions of the activation of viscous flow were estimated. The viscosity data were correlated with several semi-empirical equations. The two-parameter McAllister equation can give very good results.

scholarly journals Dielectric properties of liquid systems: study of interactions in the systems carbon tetrachloride with benzene, toluene, and p-xylene

2014 ◽  
Author(s):  
Adrian Buep
Keyword(s):  
Dielectric Properties ◽  
Carbon Tetrachloride ◽  
Dipole Moments ◽  
Excess Molar Volumes ◽  
Polar Compounds ◽  
Excess Properties ◽  
Static Permittivity ◽  
Liquid Systems ◽  
Benzene Toluene ◽  
Kister Equation

Intermolecular associations in liquid systems of non-polar and slightly polar compounds were studied through excess molar volumes, and excess dielectric properties for mixtures of carbon tetrachloride with benzene, toluene and p-xylene. These excess properties were calculated from measurements of density, static permittivity and refractive index over the whole range of concentrations, at 298.15K. The values of the excess dielectric properties for these mixtures were fitted in two different ways, one through least squares using the Redlich-Kister equation and the other using a model developed to explain deviations from ideality. The first fit was found to be descriptive while the second gave the equilibrium constant values for the interaction products actually formed in the mixtures and the respective electronic polarizabilities and dipole moments, indicating the existence of interaction products.

scholarly journals On the reduced Redlich-Kister excess properties for 1,2-dimethoxyethane with propylene carbonate binary mixtures at temperatures (from 298.15 to 318.15) K.

2017 ◽  
Vol 6 (2) ◽  
pp. 33-41 ◽  
Author(s):  
Hanen Salhi ◽  
Shaik Babu ◽  
Nada Al-Eidan ◽  
Nejib H. Mekni ◽  
Noura Omar Al-Otaibi ◽  
...  
Keyword(s):  
Propylene Carbonate ◽  
Specific Interaction ◽  
Activation Parameters ◽  
Liquid Mixtures ◽  
Excess Properties ◽  
Effect Of Temperature ◽  
Present System ◽  
Molar Gibbs Free Energy ◽  
Free Energy Of Activation ◽  
Different Temperatures

Values of excess properties in 1,2-dimethoxyethane + propylene carbonate binary liquid mixtures at different temperatures from experimental density and viscosity values presented in earlier work, were used to test the applicability of the correlative reduced Redlich-Kister functions and the Belda equation, and to reveal eventual specific interaction hidden by the classical treatment of direct excess Redlich-Kister functions. Their correlation ability at different temperatures, and the use of different numbers of parameters, is discussed for the case of limited experimental data. The relative Redlich-Kister functions are important to reduce the effect of temperature and, consequently, to reveal the effects of different types of interactions. Values of limiting excess partial molar volume at infinite dilution deduced from different methods were discussed. Also, the activation parameters and partial molar Gibbs free energy of activation of viscous flow against compositions were investigated. Correlation between the two Arrhenius parameters of viscosity shows the existence of main different behaviors separated by a stabilized structure in a short range of mole fraction in 1,2-dimethoxyethane (0.45 to 0.83). In this context, the correlation Belda equation has also been applied to the present system for thermodynamic properties in order to reveal eventual solute-solvent interaction at high dilution.

Experimental values and ERAS model calculations for excess molar volumes and enthalpies of the ternary system 2-butanol + 1,3-dioxolane + cyclohexane

2003 ◽  
Vol 81 (5) ◽  
pp. 357-363 ◽  
Author(s):  
Ignacio Gascón ◽  
Santiago Martín ◽  
Beatriz Giner ◽  
Marta Haro ◽  
Carlos Lafuente
Keyword(s):  
Ternary System ◽  
Excess Molar Volumes ◽  
Excess Properties ◽  
Model Calculations ◽  
Molar Volumes ◽  
Eras Model ◽  
System 2 ◽  
Excess Molar Properties ◽  
Experimental Values ◽  
Kister Equation

Densities and heats of mixing for the ternary system 2-butanol + 1,3-dioxolane + cyclohexane have been measured at 298.15 and 313.15 K. Excess molar volumes and excess molar enthalpies have been calculated from experimental data and fitted by the Redlich–Kister equation. The ERAS model has been used to calculate excess molar properties of the ternary mixture from parameters obtained from the constituent binary mixtures.Key words: excess properties, ERAS model.

scholarly journals Phase equilibrium studies of sulfolane mixtures containing carboxylic acids

2012 ◽  
Author(s):  
◽  
Nompumelelo Pretty Sithole
Keyword(s):  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Excess Molar Volumes ◽  
Ternary Systems ◽  
Liquid Mixtures ◽  
Effect Of Temperature ◽  
Low Grade ◽  
Volume Data ◽  
Equilibrium Studies ◽  
Molar Volumes

In this work, the thermodynamics of ternary liquid mixtures involving carboxylic acids with sulfolane, hydrocarbons including cycloalkane, and alcohols are presented. In South Africa, Sasol is one of the leading companies that produce synthesis gas from low grade coal. Carboxylic acids together with many other oxygenate and hydrocarbons are produced by Sasol using the Fischer-Tropsch process. Carboxylic acids class is one of the important classes of compounds with great number of industrial uses and applications. The efficient separation of carboxylic acids from hydrocarbons and alcohols from hydrocarbons is of economic importance in the chemical industry, and many solvents have been tried and tested to improve such recovery. This work focussed on the use of the polar solvent sulfolane in the effective separation by solvent extraction and not by more common energy intensive method of distillation. The first part of the experimental work focussed on ternary liquid-liquid equilibria of mixtures of [sulfolane (1) + carboxylic acid (2) + heptane (3) or cyclohexane or dodecane] at T = 303.15 K, [sulfolane (1) + alcohol (2) + heptane (3)] at T = 303.15 K. Carboxylic acid refers to acetic acid, propanoic acid, butanoic acid, 2-methylpropanoic acid, pentanoic acid and 3-methylbutanoic acid. Alcohol refers to methanol, ethanol, 1- propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol and 2-methyl-2-propanol. Ternary liquid- liquid equilibrium data are essential for the design and selection of solvents used from liquid- liquid extraction process. Abstract vi The separation of carboxylic acids from hydrocarbons and the alcohols from hydrocarbons is commercially lucrative consideration and is an important reason of this study. The separation of carboxylic acids or alcohols from hydrocarbons by extraction with sulfolane was found to be feasible as all selectivity values obtained are greater than 1. The modified Hlavatý, beta (β) and log equations were fitted to the experimental binodal data measured in this work. Hlavatý gave the best overall fit as compared to beta ( ) and log function. The NRTL (Non-Random, Two Liquid) and UNIQUAC Universal Quasichemical) model were used to correlate the experimental tie-lines and calculate the phase compositions of the ternary systems. The correlation work served three purposes:  to summarise experimental data  to test theories of liquid mixtures  prediction of related thermodynamics properties. The final part of the study was devoted to the determination of the excess molar volumes of mixtures of [sulfolane (1) + alcohol (2)] at T = 298.15 K, T = 303.15 K and T = 309.15 K. Density was used to determine the excess molar volumes of the mixtures of [sulfolane (1) + alcohols (2)]. Alcohol refers to methanol, ethanol, 1- propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol, 2-methyl-2-propanol. The work was done to investigate the effect of temperature on excess molar volumes of binary mixtures of alcohols and sulfolane, as well as to get some idea of interactions involved between an alcohol and sulfolane. The excess molar volume data for each binary mixture was fitted in the Redlich–Kister equation to correlate the composition dependence of the excess property.

scholarly journals Analysis of thermophysical properties of binary systems containing ethyl acetate and 1-propanol or 1-butanol

2020 ◽  
Vol 74 (3) ◽  
pp. 163-185
Author(s):  
Divna Majstorovic ◽  
Marija Mirkovic ◽  
Mirjana Kijevcanin ◽  
Emila Zivkovic
Keyword(s):  
Refractive Index ◽  
Ethyl Acetate ◽  
Binary Systems ◽  
Calculated Data ◽  
Excess Molar Volumes ◽  
Isentropic Compressibility ◽  
Experimental Measurements ◽  
Viscosity Deviations ◽  
Kister Equation ◽  
Refractive Index Deviations

The aim of this research is the experimental determination of density, viscosity, refractive index and speed of sound for binary mixtures of the ester ethyl acetate and alcohols. Experimental measurements were carried out for two systems with 1-propanol and 1-butanol at atmospheric pressure and in a temperature range 288.15 - 323.15 K. Results of experimental measurements were further used to determine excess molar volumes, viscosity deviations, refractive index deviations, and excess isentropic compressibility for each investigated mixture. These calculated data were correlated using the empirical Redlich-Kister equation. Positive values of the excess molar volume and isentropic compressibility appear for both analysed systems, while values of viscosity and refractive index deviations are negative. The structure and specific characteristics of different molecules in considered mixtures and determined non-ideal behaviour allow the insight into the possible type of interactions in the mixture, interstitial accommodation and structural effects.

scholarly journals Phase equilibrium studies of sulfolane mixtures containing carboxylic acids

2012 ◽  
Author(s):  
◽  
Nompumelelo Pretty Sithole
Keyword(s):  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Excess Molar Volumes ◽  
Ternary Systems ◽  
Liquid Mixtures ◽  
Effect Of Temperature ◽  
Low Grade ◽  
Volume Data ◽  
Equilibrium Studies ◽  
Molar Volumes

In this work, the thermodynamics of ternary liquid mixtures involving carboxylic acids with sulfolane, hydrocarbons including cycloalkane, and alcohols are presented. In South Africa, Sasol is one of the leading companies that produce synthesis gas from low grade coal. Carboxylic acids together with many other oxygenate and hydrocarbons are produced by Sasol using the Fischer-Tropsch process. Carboxylic acids class is one of the important classes of compounds with great number of industrial uses and applications. The efficient separation of carboxylic acids from hydrocarbons and alcohols from hydrocarbons is of economic importance in the chemical industry, and many solvents have been tried and tested to improve such recovery. This work focussed on the use of the polar solvent sulfolane in the effective separation by solvent extraction and not by more common energy intensive method of distillation. The first part of the experimental work focussed on ternary liquid-liquid equilibria of mixtures of [sulfolane (1) + carboxylic acid (2) + heptane (3) or cyclohexane or dodecane] at T = 303.15 K, [sulfolane (1) + alcohol (2) + heptane (3)] at T = 303.15 K. Carboxylic acid refers to acetic acid, propanoic acid, butanoic acid, 2- methylpropanoic acid, pentanoic acid and 3-methylbutanoic acid. Alcohol refers to methanol, ethanol, 1- propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1- propanol and 2-methyl-2-propanol. Ternary liquid- liquid equilibrium data are essential for the design and selection of solvents used from liquid- liquid extraction process. The separation of carboxylic acids from hydrocarbons and the alcohols from hydrocarbons is commercially lucrative consideration and is an important reason of this study. The separation of carboxylic acids or alcohols from hydrocarbons by extraction with sulfolane was found to be feasible as all selectivity values obtained are greater than 1. The modified Hlavatý, beta (β) and log equations were fitted to the experimental binodal data measured in this work. Hlavatý gave the best overall fit as compared to beta ( ) and log function. The NRTL (Non-Random, Two Liquid) and UNIQUAC Universal Quasichemical) model were used to correlate the experimental tie-lines and calculate the phase compositions of the ternary systems. The correlation work served three purposes:  to summarise experimental data  to test theories of liquid mixtures  prediction of related thermodynamics properties. The final part of the study was devoted to the determination of the excess molar volumes of mixtures of [sulfolane (1) + alcohol (2)] at T = 298.15 K, T = 303.15 K and T = 309.15 K. Density was used to determine the excess molar volumes of the mixtures of [sulfolane (1) + alcohols (2)]. Alcohol refers to methanol, ethanol, 1- propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol, 2-methyl-2- propanol. The work was done to investigate the effect of temperature on excess molar volumes of binary mixtures of alcohols and sulfolane, as well as to get some idea of interactions involved between an alcohol and sulfolane. The excess molar volume data for each binary mixture was fitted in the Redlich–Kister equation to correlate the composition dependence of the excess property.

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