Hexafluorobenzene-benzene

Figure 14.3 Boiling temperature against composition phase diagram for (xi or yi) C6F6 + (jt2 or y ) Cgf at a pressure of 0.664 MPa. Evident in the diagram is a minimum boiling azeotrope at point A and a maximum boiling azeotrope at point B. Reprinted with permission from W. J. Gaw and F. L. Swinton, Occurrence of a Double Azeotrope in the Binary System Hexafluorobenzene + Benzene Nature (London), 212, 284 (1966). Copyright MacMillan Magazines Ltd.

J. R. Goates, J. B. Ott, and J. Reeder, Solid + Liquid Phase Equilibria and Solid Compound Formation in Hexafluorobenzene + Benzene, + Pyridine, + Furan, and -fThiophen , J. Chem. Thermodyn., 5, 135-141 (1973). 

Figure 5. Temperature dependence of the peak value of Ann [mol/ mol] for the system hexafluorobenzene—benzene.

The Kirkwood—Buff theory of solutions was applied to the systems aromatic fluorocarbon/aromatic hydrocarbon. The Kirkwood-Buff integrals and the excess (or deficit) number of molecules around a central one were calculated for five systems (hexafluorobenzene—benzene, hexafluorobenzene—toluene, hexafluorobenzene—cyclohexane, benzene—toluene, benzene-cyclohexane). 

It was found that a particular composition exists in the systems of hexafluorobenzene—benzene and hexafluorobenzene—toluene for which all Ana are zero and that at this... 

The experimental data for the hexafluorobenzene-benzene system in Table 10.2-4 and Fig. 10.2-11 show a rarely encountered degree of complexity in low-pressure... 

Figure 10.2-11 The x-y diagram for the hexafluorobenzene-benzene system at 60°C based on. the data of Gaw and Swinton [Tranr. Faraday Soc., 64 2023 (1968)].

Aracil, J. Rubio, R. G. Caceres, M. Diaz Pena, M. Renundo, J. A. R. Excess properties of the hexafluorobenzene -n-hexadecane and hexafluorobenzene - benzene - n-hexadecane systems at 298.15 K Fluid Phase Equilib. 1986,31,71-87... 

Gaw, W. J. Swinton, F. L. Thermodynamic properties of binary systems containing hexafluorobenzene. Part 4. Excess Gibbs free energies of the three systems hexafluorobenzene + benzene, toluene, and p-xylene Trans. Faraday Soc. 1968,64,2023-2034... 

The benzene dimer has two nearly isoenergetic structures (sHpped-parallel and T-shaped) [9,11]. Dispersion stabiUzes the slipped-parallel benzene dimer strongly, while the electrostatic interaction is repulsive in the slipped-parallel dimer. However, the electrostatic interaction stabihzes the T-shaped benzene dimer, while the stabilization due to dispersion is small in the T-shaped dimer [9]. On the other hand, both dispersion and electrostatic interactions stabihze the stacked hexafluorobenzene-benzene complex, producing a large attractive force between hexafluorobenzene and benzene. 

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