| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程研究所 === 83 === The objective of this study is to investigate the behavior of
liquid-liquid equilibria of electrolyte solutions, including
theoretical simulation and experimental studies. The
experiments of liquid-liquid equilibria of electrolyte
solutions were carried out for the systems of NPA-H2O-LiCl,
NPA- H2O-NaCl, NPA-H2O-NaBr, NPA-H2O-KCl, NPA-H2O-CaCl2, IPA-H2
O-NaCl and IPA-H2O-CaCl2 at atmospheric pressure and 25℃. In
the theoretical simulation, a model to correlate the liquid-
liquid equilibria of electrolyte solutions has been developed.
The activity coefficients of the solvents in the model were
calculated by combining a Debye-Huckel-type term with a
modified UNIQUAC equation. To describe the separation of liquid-
liquid phases owing to the addition of electrolyte in the
system, the Gibbs-Duhem equation was employed to calculate the
mean activity coefficient of the electrolyte. Based on the mass
balance, with an assumption for the chemical potential of the
electrolyte at reference state, the mole fractions in both
liquid phases can be calculated. In the correlation, only two
adjustable parameters are needed. It was found that the
theoretical simulation for most cases was in good agreement
with the experimental data.
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