| Summary: | 碩士 === 國立台灣工業技術學院 === 化學工程技術研究所 === 85 === The objective of this study is to investigate the behavior of
vapor-liquid equilibria of electrolyte solutions, including
experimental measurements and theoretical calculations. In the
experiment part, a static-type vapor-liquid equilibrium (VLE)
apparatus was employed to measure the equilibrium data for two
systems of electrolyte solutions with salt concentrations
varying from zero to saturation: 1. organic acid aqueous
solutions system, (1) water-propionic acid , with NaCl as the
electrolyte, (2) water-acetic acid, with NaCl or NH4Cl as the
electrolyte; 2. MTBE-methanol system, with NaCl, KI, or LiCl as
the electrolyte. The experimental data obtained satisfy the
thermodynamic consistency tests of both area and point methods.
In the theoretical calculation part, either semi-chemical theory
model or chemical theory model, combined with the modified
Wilson model, was used to predict the VLE of electrolyte
solutions for the organic acid aqueous solutions system, where
dimerization occurs. As for the MTBE-methanol system, where no
dimerization occurs, the Peng-Robinson equation of state was
employed together with the modified Wilson activity coefficient
model to predict the VLE of the electrolyte solutions of this
system. The predicted results for all three systems agree quite
well with the experimental data. The parameters of the
modified Wilson model was calculated for each system by the
method of vapor pressure lowering, and the method of boiling
point elevation as well. The parameters obtained by both methods
were then used to calculate the temperatures and vapor
compositions of the VLE. It was found that the calculated
results by both methods agree equally well with the experimental
data.
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