US EPA

1610153 

Journal Article 

Topological transformation of a phase diagram for the sodium nitrate-water-isopropanol ternary system 

Cherkasov, DG; Il'in, KK; Kurskii, VF 

2011 

1 

Russian Journal of Inorganic Chemistry
ISSN: 0036-0236
EISSN: 1531-8613 

56 

5 

787-791 

10.1134/S0036023611050068 

WOS:000291229000020 

Phase equilibria and critical phenomena in the sodium
nitrate-water-isopropanol ternary system, where a boundary binary liquid system shows no
immiscibility over the entire temperature range of its liquid state, were studied in the range
from 5 to 90A degrees C using a visual polythermal method. The formation temperature of a
monotectic critical tie-line was determined to be 6.1A degrees C, and the solution compositions
corresponding to critical solution points at various temperatures were determined. Isopropanol
partition coefficients between the aqueous and organic phases of monotectic equilibrium were
calculated for seven temperatures. The isopropanol salting out from aqueous solutions by sodium
nitrate was shown to be enhanced by rising temperature. Isothermal phase diagrams of the title
system were constructed to verify a fragment of the general scheme of topological transformations
of phase diagrams for salt-binary solvent ternary systems with salting out.