Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

To separate the azeotropes of hexane + ethanol / 1-propanol, two ionic liquids [HMIM][BF4] and [HMIM][OTf] were adopted as extractive agents. And the corresponding ternary liquid-liquid equilibrium data for the mixtures of hexane + ethanol + [HMIM][BF4], hexane + 1-propanol + [HMIM][BF4] and hexane + 1-propanol + [HMIM][OTf] were measured at 298.15 K and 101.3 kPa. The distribution coefficient (B) and selectivity (S) were obtained to evaluate the separation performance of the selected extractants to extract ethanol / 1-propanol from the azeotropes. Meanwhile, the influence of the ILs anions and the alcohol carbon chain length were investigated. In addition, the NRTL and UNIQUAC models were adopted to correlate the ternary liquid-liquid equilibrium data, and the binary interactive parameters were regressed. And the calculated results of the models agreeed with the measured data. Meanwhile, the binodal curves of the ternary systems were predicted using the UNIFAC model.