Liquid-Liquid-Equilibrium in the iso-propanol - Na2SO4
- H2O system
Water and iso-propanol are miscible in all proportions. A miscibility
split can be caused by a number of salts. One of them is sodium sulfate.
The phase diagram below shows experimental data for liquid-liquid equilibrium
in the isopropanol - Na2SO4 - H2O system
at 35°C. The experimental data were measured by Lynn et al. (ref.
1). The phase diagram shows the binodal curve
calculated with the Extended UNIQUAC model together with the experimental
The model parameters used for the calculation are those from Thomsen et al.
(ref. 2). The calculation was performed with the multi-phase flash
(VLLSE) routine developed by Aqueous Solutions Aps and implemented in a DLL
callable from Microsoft Excel.
Lynn, S., Schiozer, A. L., Jaecksch, W. L., Cos, R., Prausnitz, J. M.,
"Recovery of anhydrous Na2SO4
from SO2-scrubbing liquor by extractive crystallization:
liquid-liquid equilibria for Aqueous Solutions of Sodium Carbonate,
Sulfate, and/or Sulfite Plus Acetone, 2-Propanol, or tert-Butyl
Alcohol", Ind. Eng. Chem. Res., 35(1996)4236-4245,
Thomsen, Kaj; Iliuta, Maria; and Rasmussen, Peter, "Extended UNIQUAC
model for correlation and prediction of vapor-liquid-liquid-solid
equilibria in aqueous salt systems containing non-electrolytes. Part B.
Alcohol (Ethanol, Propanols, Butanols) - water - salt systems". (Chemical
Engineering Science 59(2004)3631-3647, issue 17),