Bojan D. Djordjević

Excess volumes of acetone + benzene, acetone + cyclohexane, and acetone + benzene + cyclohexane at 298.15 K☆

Abstract Excess volumes of the binaries: acetone + benzene and acetone + cyclohexane, and for the ternary: acetone + benzene + cyclohexane, have been determined from density measurements at 298.15 K. Analytical expressions which represent the composition dependences of the excess volumes are reported.

Vapour—liquid equilibria of the systems acetone—benzene, benzene—cyclohexane and acetone—cyclohexane at 25°C

Vapour—liquid equilibrium data for the binary systems acetone—benzene, benzene—cyclohexane and acetone—cyclohexane have been determined experimentally at 25°C. The reduction producers based on P - x - y as well as on P - x isothermal data sets, which incorporate usual thermodynamically consistent models expressing the dependence of activity coefficients of liquid composition, have been examined for representing the reported results. Nonideal behaviour of the both phases has been taken into account. Thermodynamic consistency of the data has been shown by comparing of the experimentally obtained vapour compositions with those calculated from P - x data using the best of the examined models for activity coefficients.

Mixing cell for indirect measurements of excess volume

Abstract A mixing cell suitable for making liquid mixtures of accurately known composition is described and has been tested by measurements of the excess volume of benzene + cyclohexane.

Excess molar volume prediction for some hydrocarbons and related mixtures by means of simple cubic equations of state

Abstract Excess molar volumes of some mixtures of non-polar and slightly polar compounds at 25°C and atmospheric pressure were predicted by means of simple cubic equations of state. Satisfactory results were obtained only for simple symmetric non-polar mixtures. The excess volumes of complex liquid mixtures could be better predicted by the use of recently published cubic equations of state with three or more parameters and new mixing rules.

Modeling of Volumetric Properties of Organic Mixtures Based on Molecular Interactions

Mixing effects for thousands of compounds and their mixtures used in the process industry are rather difficult to be known, hence knowledge of thermodynamic properties such as densities, as well as excess molar volumes, VE, of organic mixtures at various temperatures is of great importance. Selection of systems for analysis should be based on molecular structure of the individual components, as well as their industrial and ecological significance. Mixing of the compounds with different and complex molecular structure leads to various intermolecular interactions, resulting in non-ideal behaviour of mixtures. Therefore, knowledge of volumetric properties of individual components and their mixtures helps in understanding the complex structure of liquids.

Applicability of cubic equation of state mixing rules on correlation of excess molar volume of Non-Electrolyte binary mixtures

The excess molar volume V E data of the binary liquid systems were correlated by the Peng–Robinson–Stryjek–Vera equation of state coupled with two different types of mixing rules: composition dependent van der Waals mixing rule (vdW) and the mixing rule based on the Gupta–Rasmussen–Fredenslund method (GRF), with the NRTL equation as G E model. The results obtained by these models show that type of applied mixing rule, a number and position of interaction parameters are of great importance for a satisfactory correlation of V E data. The GRF mixing rules coupled with the NRTL model gave mostly satisfactory results for V E correlation of the nonideal binary systems of diverse complexity.

Applicability of the redlich-kwong equation of state and its modifications to polar gases

Abstract The constants of the Redlich-Kwong equation of state were optimized for each available isotherm using the experimental P-v-T data of nonpolar, slightly

Simultaneous presentation of VLE, HE and cpE by the PRSV equation of state with the modified van der Waals one-fluid and Huron–Vidal–Orbey–Sandler mixing rules

Abstract The Stryjek–Vera modification of the Peng–Robinson equation of state with two parameter van der Waals one-fluid mixing rule suggested by Schwartzentruber and Renon (SR) and the Orbey–Sandler modification of the Huron–Vidal mixing rule (HVOS) was applied for simultaneous description of vapor–liquid equilibrium (VLE), excess enthalpy ( H E ) and excess heat capacity ( c p E ) data (VLE+ H E , H E + c p E , VLE+ c p E and VLE+ H E + c p E ). The HVOS mixing rule coupled with the NRTL equation using the temperature dependent parameters with six optimized coefficients gave mostly satisfactory results for simultaneous fitting of VLE+ H E , VLE+ c p E , H E + c p E and VLE+ H E + c p E data of the non-ideal binary systems diverse complexity.

Prediction of excess molar volumes of binary mixtures of organic compounds from refractive indices

The excess molar volumes of 51 binary mixtures containing diverse groups of organic compounds: alcohols (methanol, ethanol, propan-1-ol, butan-1-ol, pentan-1-ol, hexan-1-ol, and heptan-1-ol), (cyclo-) alkanes (hexane, heptane, octane, nonane, decane, undecane, dodecane, and cyclohexane), esters (diethyl carbonate and ethyl chloroacetate), aromatics (o-xylene, m-xylene, p-xylene, and ethylbenzene), ketones (acetone), and ethers (anisole), were predicted from the refractive index data, using three types of equations coupled with several different mixing rules for refractive index calculations: the Lorentz-Lorenz, Dale-Gladstone, Eykman, Arago-Biot, Newton, and the Oster. These systems were chosen since they belong to different classes of organic species forming molecular interactions and intermolecular forces during mixing resulting in positive or negative, smaller or larger deviations from ideal behaviour. The obtained results were analysed in terms of the applied equation and mixing rule, the nature of compounds of the mixtures and the influence of alkyl chain length of the alkane or alcohol molecule.

Thermodynamic Modeling of Vapor-Liquid Equilibria and Excess Properties of the Binary Systems Containing Diethers and n-Alkanes by Cubic Equation of State

A comparison of the performances of two different approaches of cubic equations of state models, based on a classical van der Waals and mixing rules incorporating theGE equation, was carried out for correlation of Vapor-Liquid Equilibria (VLE), HE and CPE data alone, and simultaneous correlation of VLE+HE, VLE+CPE, HE +CPE and VLE+HE +CPE data for the diethers (1,4-dioxane or 1,3-dioxolane) with n-alkane systems. For all calculations the Peng-Robinson-Stryjek-Vera cubic equation of state (PRSV CEOS) was used. A family of mixing rules for the PRSV CEOS based on the Modified van der Waals one-fluid mixing rule (MvdW1) and two well-known CEOS/GE mixing rules (MHV1 and MHV2), was considered. The NRTL equation, as the GE model with linear or reciprocal temperature dependent parameters, was incorporated in the CEOS/GE models. The results obtained by the CEOS/GE models exhibit significant improvement in comparison to the MvdW1 models.