Abstract
The shape of the liquid-liquid coexistence curve in the C7H16-C6F14 system in the molar concentration-temperature coordinates close to the critical solution point was studied by narrow-beam gamma-raying of two-phase samples. The molar volumes of the coexisting liquid phases and critical point coordinates (critical temperature T c = 316.266 ± 0.03 K and critical concentration x c = 39.0 ± 0.4 mol % C6F14) were determined. The critical index β of the coexistence curve was found to be 0.322 ± 0.005. The diameter of the coexistence curve did not obey the classic “rectilinear diameter rule.”
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Original Russian Text © R.A. Khairulin, S.V. Stankus, V.A. Gruzdev, V.A. Bityutskii, 2009, published in Zhurnal Fizicheskoi Khimii, 2009, Vol. 83, No. 1, pp. 62–67.
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Khairulin, R.A., Stankus, S.V., Gruzdev, V.A. et al. Liquid-liquid equilibrium in the-n-heptane-n-perfluorohexane system. Russ. J. Phys. Chem. 83, 50–55 (2009). https://doi.org/10.1134/S0036024409010117
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DOI: https://doi.org/10.1134/S0036024409010117