Izvestiya of Saratov University.

Chemistry. Biology. Ecology

ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)
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Language: 
Russian
Heading: 
Chemistry
Article type: 
Article
UDC: 
544.344.016+536.44:544.344.013–16–14+544.344.3
DOI: 
10.18500/1816-9775-2019-19-3-274-283

Data Approximation for Plotting the Binodal Curve on the Phase Diagrams of Some Ternary Salt – Water – Isopropyl (n-Propyl) Alcohol Systems

Autors: 
Cherkasov Dmitry G., Saratov State University
Il’in Konstantin Kuzmich, Saratov State University
Abstract: 

A brief review of computational methods for the liquid-liquid equilibrium has been carried out, and their capabilities and limitations have been shown. Complications of such computational models for the liquid–liquid–solid equilibrium lead to a decreased accuracy of calculations. In this case, it is advisable for researchers to make use of the approximation of experimental data on the liquid – liquid and liquid – liquid – solid equilibria. A literature review on the ternary salt – water – aliphatic alcohol systems is carried out, where solubility data and the compositions of equilibrium liquid phases were approximated. Based on the analysis of our own experimental data from a polythermal study of phase equilibria and critical phenomena in seven ternary systems sodium (potassium, cesium) nitrate – water – isopropyl alcohol, potassium chloride (bromide, iodide) – water – isopropyl alcohol, potassium nitrate – water – N-propyl alcohol, exponentialtype empirical equations are proposed, which made it possible to successfully approximate our data for plotting the binodal curve in a wide temperature range. The approximations found were established to be satisfied for the individual branches (the water and organic ones) of the binodal curve as well as for it as a whole. The dependences obtained can be useful for predicting changes in the solubility of two liquid phases with temperature and for facilitating the modeling of the binodal surface within the temperature – concentration prism of the ternary salt – binary solvent system.

Key words: 
solubility
phase equilibria
liquid- liquid equilibrium
binodal curve
approximation of experimental data
ternary system
isopropyl alcohol
salting-out
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