Benzene-cyclohexane, thermodynamic data

Sanni and Hutchison (1973) presented data on the binary Fick dilfusivity for the systems benzene-chloroform, cyclohexane-carbon tetrachloride, cyclohexane-toluene, benzene-cyclohexane, benzene-toluene, and diethyl ether-chloroform. Calculate the thermodynamic factor F for these systems using parameters from Gmehling and Onken (1977ff). Hence, estimate the Maxwell-Stefan diffusion coefficients and test the applicability of the Vignes model. 

Segovia, J. J. Martin, M. C. Chamorro, C. R. Villamanan, M. A. Excess thermodynamic functions for ternary systems containing fuel oxygenates and substitution hydrocarbons. 1. Total-pressure data and GE for methyl tert-butyl ether-benzene-cyclohexane at 313.15 K Fluid Phase Equilib. 1997,133, 163-172... 

Oscik and Goworek discuss the calculation of activity coefficients by equations (8) and (9). For systems of molecules of the same size the two methods should be equivalent. The authors have analysed the experimental data of Lu and Lama for the adsorption from benzene+cyclohexane mixtures by silica gel. The graphically presented results indicate that the curves derived from equation (8) and (9) deviate considerably from one another. However, since no details are given of the values assumed for the molar areas it is not possible to identify the origin of these discrepancies, which because of the close similarity of the sizes of the molecules concerned, are unexpected. Madan has used equation (9) to calculate the activity coefficients of benzene and acetic acid adsorbed from their mixtures by tin oxide gel 0 — 160 m g ). The results look surprising and consideration of the behaviour of ln(Y2/yT) shows that the two sets of activity coefficients are thermodynamically inconsistent, presumably as a result of a computational error. 

The knowledge of reliable thermodynamic data of saturated and aromatic hydrocarbons in water is very useful in several practical and theoretical fields, f.i. it is essential for the developments of the concepts of the hydrophobic hydration and of the hydrophobic interaction largely used for the understanding of some important biological phenomena. So new experimental data of high quality are necessary, having the elaborations of the existing material reached their limits. In the last years instead new solubility data in pure water have been reported only for methane(10,53a) ethane(53), cyclo-propane(54), n-butane(9,53a) and benzene(17). Enthalpies of hydration have been furthermore determined by direct calorimetric measurements only for benzene and some derivatives, cyclohexane, pentane and hexane(29). 

Anionic polymerization was utilized again in studies of thermodynamics of styrene propagation185. The equilibrium concentration of that monomer is exceedingly low at ambient temperature, and hence the experimentation required elevated temperatures. However, living polystyrene in THF is rapidly destroyed at those temperatures. To avoid these difficulties, living polystyrene formed by BuLi initation in cyclohexane or benzene was used in the studies. The results are presented in Fig. 5 and in Table 1. The effect of the solvent s nature on Me is revealed by these data. 

Halogenated Hydrocarbons, Solubility-Miscibility with Water In addition to a comprehensive discussion of solution theory, this publication contains solubility data on Ci-Cg halogenated compounds including both benzene and cyclohexane derivatives. Thermodynamic information is also compiled. 

The classical thermodynamic approach has been applied to liquid phase adsorption by Larionov and Myers and by Minka and Myers. It was shown that for sorption of carbon tetrachloride-isooctane and benzene-carbon tetrachloride on aerosil the adsorbed solutions show approximately ideal behavior whereas adsorbed mixtures of benzene, ethyl acetate, and cyclohexane on activated carbon showed appreciable deviations from ideality. However, it is shown that the activity coefficients and hence the adsorption equilibrium data for the ternary systems may be successfully predicted, by classical methods, from data for the constituent binaries. 

Cocero, M. J. Mato, F. Garcia, Cobos, J. C. Kehiaian, II. V. Thermodynamics of binary mixtures conteiining organic carbonates. Isotherm vapor-liquid equilibria for dimethyl carbonate -1- cyclohexane, + benzene, or-H tetrachloromethane J. Chem. Eng. Data 1989,34, 73-76... 

Aromatic molecules are hydrophobic but their thermodynamic hydration parameters are essentially different from those of aliphatic hydrocarbons (Table 2.5). The data in this table reveal that for benzene and toluene the A Gtr values are negative, primarily resulting from less unfavorable A Str values. Advanced MD simulations of the hydration of benzene and cyclohexane have shown that there is a definite tendency for H-bond interactions of the waters with the tt-electron system of the aromatics. This is confirmed by the solubility... 

Marongiu, B. Dernini, S. Polcaro, A. M. Thermodynamics of binary mixtures containing cyclic alkanones. Excess enthalpies of cyclopentanone and cyclohexanone + n-alkanes, + cyclohexane, + benzene, and + tetrachloromethane J. Chem. Eng. Data 1986, 31,185-189... 

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