Vapor-liquid equilibria of water plus acetic acid, and water plus propionic acid systems saturated with sodium chloride

摘要

The vapor-liquid equilibrium data for water + acetic acid and water + propionic acid systems saturated with sodium chloride are reported at atmospheric pressure. The experimental data satisfy the Herington thermodynamic consistency test. Water is observed to be a salting-in component. An azeotrope is formed at 74.09 mol% of water for the saturated sodium chloride + water + acetic acid system. For the water + propionic acid system, the location of azeotrope is changed from 94.97 to 81.25 mol% of water when saturated sodium chloride is added to the system. Without any additional adjustable parameter, a calculation method developed in our previous work is utilized to predict the salt effect on the vapor-liquid equilibrium. For both systems, the predicted results agree well with the experimental data, with the mean deviations of vapor-phase composition and bubble point temperature being less than 1.7 mol% and 1.6 K, respectively. [References: 9]