Phase diagram of the vapor-liquid-liquid-solid equilibrium of the water + NaCl + 1-propanol system at 101.3 kPa

Abstract

Highlights-Vapor-liquid-liquid equilibrium data are determined-Vapor-liquid-solid and vapor-liquid-liquid-solid equilibrium data are determined-Results are compared with literature data-The influence of salt on water + 1-propanol equilibria is studied-The influence of temperature is also studied.

Consistency of experimental data in SLLV equilibrium of ternary systems with electrolyte. Application to the water + NaCl + 2-propanol system at 101.3 kPa

“…Lastly, the SLLVE region is represented by a triangle whose three vertices are the solid salt and the compositions of the two liquid phases that are in equilibrium with each other. It can be observed that the shape of this phase diagram at boiling temperatures is very similar to that of the water + NaCl + 1-propanol system [2]. Comparison with previous bibliography results.…”

“…However, the literature available on the mixed solvent electrolyte systems is scarce. Moreover, the relatively small amount of existing experimental data is incomplete and some of them containing important inconsistencies as shown in a previous paper [2].…”

“…In two previous papers [2,5], we studied the equilibrium diagram of the water + NaCl + 1butanol and water + NaCl + 1-propanol systems at 101.3 kPa in order to examine the shapes of the various equilibrium surfaces and regions that occur in them. To do this, a detailed analysis of the evolution with temperature of the different equilibrium regions of these systems was carried out.…”

SLLE and SLLVE of the water + NH 4 Cl + 1-propanol system at 101.3 kPa

“…This type of mixture is found in many processes including extractive distillation, crystallization, regeneration of solvents and liquid-liquid extraction of mixtures containing salts. The literature available on these systems is scant, the relatively small amount of existing experimental data is incomplete and some of them contain important inconsistencies as shown in a previous paper [2]. Consequently, the users of thermodynamic models such as the electrolyte NRTL model [3] or the extended UNIQUAC model for electrolytes [4] applied to represent these systems have difficulties to find experimental equilibrium data to calculate the model parameters.…”

“…In this sense, we previously studied the equilibrium diagram of the water + NaCl + 1-propanol system at 101.3 kPa [2] in order to examine the shapes of the various equilibrium surfaces and regions that arise in it. The electrolyte was NaCl whose solubility in water changes little with temperature: only 6.7% in 100 K (from 26.28 wt% at 273.15 K to 28.05 wt% at 373.15 K) [5].…”