Temperature dependence of the properties of ternary systems ethanol + water + an aliphatic alkane (C6-C9)

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The measures and calculation of different properties such as refractive
index, density, speed of sound, excess molar volume, and isentropic
compressibility of the ternary heterogeneous compounds by ethanol +
water + (n-hexane, n-heptane, n-octane, n-nonane) have been performed
in the range 288.15–323.15 K and atmospheric pressure. Attending to
the accurate results of these models, the equation of state enclosing
mixing rules is indicated as a simple estimation of the procedures of
these properties for this kind of multicomponent systems.



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PVT study for the mixtures diethyl carbonate + n-alkane


This paper presents a PVT study for diethyl carbonate and n-alkanes pure components and their binary mixtures (dialkyl carbonate + n-alkane) in the temperature range of (278.15 – 353.15) K and pressures between (0.1 and 40) MPa. The experimental density values were compared with experimental information available in the literature. The purpose of this study is to extend the available experimental information about the thermophysical behaviour of this kind of mixtures, which is useful in fuel field.

A modified Tait equation was used in order to fit the density values and to obtain the derived properties such as isothermal compressibility coefficient, isobaric thermal expansivity coefficient and internal pressure. Besides, the ability of the Nitta–Chao model for the prediction of density values and derived properties for these mixtures was tested.

The dialkyl carbonates are useful organic solvents for the chemical industry. Moreover, these molecules with base carbonate and containing an aromatic and an aliphatic parts have an important industrial interest as gasoline additives and as lubricants in the replacement of CFCs (chlorofluorocarbons) with the new refrigerants HFCs (hydrochlorofluorocarbons). These industrial uses are the reason why there has been considerable upsurge in the theoretical and experimental investigations of dialkyl carbonates and of their mixtures with other compounds.


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