Temperature Coefficients of the Refractive Index for Complex Hydrocarbon Mixtures (original) (raw)
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Temperature coefficients of the refractive index (dn/dT) for nine hydrocarbons and two sets of binary mixtures were investigated in this work. The measured Àdn/dT values for the pure hydrocarbons were found to be inversely proportional to their molar volumes (V m ) and molecular weights (M). Experimental data for binary mixtures show that Àdn/dT varies linearly with volume and mass fractions, consistent with theory derived from the linear relationships of Àdn/dT with 1/V m and 1/M for individual hydrocarbons. This study should aid the interpretation of the observed correlations of dn/dT with physical and combustion properties of diesel fuels.
Study of the refractive index of gasoline+alcohol pseudo-binary mixtures
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The properties of gasoline change as a result of blending with a bioalcohol, affecting the behavior of the pseudo-binary system. The aim of this paper is to present experimental data of the refractive index for pseudobinary mixtures of a reformate gasoline with ethanol, isopropanol and n-butanol over the entire composition range and for temperature ranging from 293.15 K to 313.15 K. The accuracy of different equations to predict the refractive index of the mixtures was tested. The best prediction accuracy (the lower AAD) corresponded to Eykman and Lorentz-Lorenz mixing rules. A logarithmic equation proposed to correlate the refractive index with composition and temperature of gasoline+alcohol mixtures showed a good accuracy (the absolute average deviation AAD < 0.052%). The deviations in refractive index for investigated systems are negative over the entire composition range and at all investigated temperatures.
Study of the refractive index of gasoline+alcohol pseudo-binary mixtures Seria Chimie
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The properties of gasoline change as a result of blending with a bioalcohol, affecting the behavior of the pseudo-binary system. The aim of this paper is to present experimental data of the refractive index for pseudobinary mixtures of a reformate gasoline with ethanol, isopropanol and n-butanol over the entire composition range and for temperature ranging from 293.15 K to 313.15 K. The accuracy of different equations to predict the refractive index of the mixtures was tested. The best prediction accuracy (the lower AAD) corresponded to Eykman and Lorentz-Lorenz mixing rules. A logarithmic equation proposed to correlate the refractive index with composition and temperature of gasoline+alcohol mixtures showed a good accuracy (the absolute average deviation AAD < 0.052%). The deviations in refractive index for investigated systems are negative over the entire composition range and at all investigated temperatures.
Chemical Engineering Communications, 2007
The refractive indices, n D , of pure benzene and 1,2-dichloroethane (DCE) and those of their binary mixtures have been measured over the whole composition range and at 298.15, 303.15, 308.15, 313.15, and 318.15 K. Using the experimental n D data, deviations in refractive indices, Dn D , molar refraction, DR m , reduced free volume, DðV =R m Þ, and internal pressure, DP int , have been estimated. Parameters of polynomial equations, which represent the composition dependence of physical and derived properties, are gathered. The results are discussed in terms of molecular interactions between the component molecules. Applicability of eight different refractive index mixing rules-Lorentz-Lorenz, Weiner, Gladstone-Dale, Heller, Arago-Biot, Newton, Eykman, and Oster's relation-is tested against the measured results, and good agreement has been obtained. Moreover, molecular radii, r, and average molecular radii ðr mix Þ of the liquids and their mixtures have been calculated.
The Canadian Journal of Chemical Engineering, 2011
Densities and refractive indices of binary mixtures of isopropylethanoate with several symmetrical hydrocarbons viz cyclohexane, benzene, 1,4-dimethylbenzene and 1,3,5-trimethylbenzene at 308.15 K have been measured. The excess molar volumes (V E) are evaluated from the measured density values for the four binary systems. Experimental refractive indices are used to evaluate deviation in refractive indices (n) and molar refraction at experimental temperature. V E values are positive for the mixtures studied except binary mixtures between ester and 1,4-dimethylbenzene which have negative V E values. Standard deviations (V E) and (n) are also reported. Results are discussed in terms of molecular interactions between the components of the mixtures. Nous avons mesuré les densités et les indices de réfraction de mélanges binaires d'isopropyléthanoate avec plusieurs hydrocarbures symétriques, soit du cyclohexane, du benzène, du 1,4-diméthylbenzène et du 1,3,5-triméthylbenzèneà 308,15 K. Les volumes molaires excédentaires (V E) ont etéévaluésà partir des densités mesurées pour les quatre systèmes binaires. Les indices expérimentaux de réfraction ont serviàévaluer l'écart des indices de réfraction (n) ainsi que la réfraction molaireà la température expérimentale. Les valeurs des VEétaient positives pour les mélangeś etudiésà l'exception des mélanges binaires d'ester et de 1,4-diméthylbenzène qui présentaient des valeurs des VE négatives. Lesécarts type (V E) et (n) sontégalement indiqués. La discussion des résultats porte sur les interactions moléculaires entre les composants des mélanges.
Physics and Chemistry of Liquids, 2013
The measures of the refractive indices of the ternary mixtures chlorobenzene + n-hexane +(n-nonane or n-decane) have been done at 298.15K and atmospheric pressure in the whole composition diagram. The composition dependence of the derived magnitude has been compared with the data obtained with several theoretical models. Attending to the accurate results of these models, the equation of state enclosing mixing rules are pointed out as simple procedures for a multicomponent estimation of refractive indices, the corresponding binary parameters could be used to other thermophysical studies
Refractive indices, densities and excess properties of binary mixtures ot ethanol, wtih hexane, hepatano, octane, and wáter have been determined experimentally over the entire range of composition at (293.15, 298.15, 303.15 and 308.15) . The excess molar volumen and changes of refractive índices on mising data were fitted to the fourth order Redlich Kister equation for the determination of the adjustable parameters.
Bistua: Revista de la Facultad de Ciencias Básicas, 2010
Refractive indices and densities of binary mixtures of ethanol + hexane, heptane, octane and water have been determined experimentally over the entire range of composition at (293.15, 298.15, 303.15, 308.15) K and at atmospheric pressure. The excess molar volume and changes of refractive indices D n on mixing data were fitted to the fourth order Redlich-Kister equation for the determination of the adjustable parameters. The corresponding excess molar volume and changes of Refractive indices values have been evaluated from the experimental data and fitted to a temperature dependent equation. The sign and magnitude of the calculated excess quantities have been discussed in terms of the nature of the solvent-solvent interactions in binary 2 mixtures.
E-Journal of Chemistry, 2007
Density and refractive index have been experimentally determined for binary liquid mixtures of eucalyptol with hydrocarbons (o-xylene,m-xylene and toluene) at 303.15 K, 308.15 K and 313.15 K. A comparative study of Lorentz-Lorenz (L-L), Weiner (W), Heller (H), Gladstone-Dale (G-D), Arago-Biot (A-B), Eykman (Eyk), Newton (Nw), Eyring-John (E-J) and Oster (Os) relations for determining the refractive index of a liquid has been carried out to test their validity for the three binaries over the entire mole fraction range of eucalyptol at 303.15 K, 308.15 K and 313.15 K. Comparison of various mixing rules has been expressed in terms of average deviation. From the experimentally measured values, refractive index deviations at different temperatures have been computed and fitted to the Redlich-Kister polynomial equation to derive the binary coefficients and standard deviations.
International Journal of Thermophysics, 2006
Experimental densities, ρ, and refractive indices, n D for binary liquid mixtures of benzene with triethylamine (TEA) and tributylamine (TBA) have been measured as a function of composition in the temperature range from 278.15 to 318.15 K. The excess molar volume, V E , and its temperature dependence, dV E /dT for the binary mixtures were calculated using the experimental data. The values of V E for the mixtures were also estimated by using the Flory statistical theory and refractive index.