Abstract
The results of a polythermal study of the salting out action of alkali metal (Na, K, and Cs) nitrates on the water–triethylamine binary system characterized by stratification with a lower critical solution temperature (LCST) were comparatively analyzed. Alkali metal nitrates experiencing homoselective solvation in aqueous-organic solvents were found to decrease the LCST of this binary system, that is, have a salting out action. A decrease in the radius of the cation in the series CsNO3–KNO3– NaNO3 decreased the temperature of critical tie line formation in the monotectic state of salt–water–triethylamine ternary systems (16.3, 12.7, and –16.5оC, respectively). It is shown in each ternary system the effect of salting out triethylamine from aqueous solutions grew as the temperature increased, stronger in the system with sodium nitrate. The conclusion was drawn that, among the salts studied, sodium nitrate had the strongest salting out effect at –16.5–25.0оC.
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