Thermodynamic study of perfluorohexane + ether mixtures: VLE, LLE, and HE

摘要: Abstract Vapour–liquid equilibria (VLE), liquid–liquid (LLE), and excess enthalpies (HE) of binary mixtures perfluoro-n-hexane plus an ether (diethyl, dipropyl, dibutyl, butyl methyl, ethyl ether), have been determined using a head-space gas-chromatographic technique, turbidimetric apparatus, heat-flow calorimeter, respectively. A recently designed titration technique calculation procedure used to obtain HE from heats solution. The observed coexistence curves compared with those predicted by the activity coefficients γi their temperature dependence. All are strongly endothermic (HE > 0) show large positive deviations ideality (GE > 0), which increase size ether. Molecular interactions examined calculating discussing solvation functions Kirkwood–Buff (KB) integrals. Perfluorohexane proved be inert molecule that interacts ethers more weakly than hexane.