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Liquid–liquid equilibrium of substituted perfluoro-n-octane+n-octane systems

2008; Elsevier BV; Volume: 268; Issue: 1-2 Linguagem: Inglês

10.1016/j.fluid.2008.04.011

1879-0224

Fátima R. Varanda, Lourdes F. Vega, João A. P. Coutinho, Isabel M. Marrucho,

Thermodynamic properties of mixtures

Abstract The liquid–liquid phase equilibria of substituted perfluoro-n-octane (1Br-perfluoro-n-octane, 1H-perfluoro-n-octane, 1H,8H-perfluoro-n-octane) + n-octane were experimentally determined by turbidimetry in the temperature range between 270 K and 330 K and at the vapor pressure of the mixture. The measured equilibrium data were correlated with an equation derived from renormalization group (RG) theory and with soft-SAFT Equation of State. The LLE data of the binary mixtures of n-octane + substituted perfluoro-n-octane were compared with n-octane + perfluoro-n-octane data. The results indicate an increasing solubility with 1Br-perfluoro-n-octane and show that the introduction of second hydrogen atom has almost no effect on phase equilibrium.