Efficient methods to study phase equilibria in multinary aqueous systems

Мазунин, С. А.; Носков, М. Н.; Елсуков, А. В.

doi:10.1134/s0036023617050163

Cited by 10 publications

(1 citation statement)

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“…Phase equilibria in the Ca(NO 3 ) 2 −KNO 3 −H 2 O system at 25°C were studied by the isothermal sections method [31,32]. Batches of set compositions were prepared by weighing the components on an AND GR-200 electronic analytical balance accurate to ±0.0001 g. Isothermal exposure was provided by means of a LOIP LT-316a circulation thermostat (to ±0.2°С) and a DAIHAN WiseShake SHO-2D shaker.…”

Section: Methodsmentioning

confidence: 99%

Phase Equilibria in the KNO3–Ca(NO3)2–H2O System at 25°C

Кистанова

Mukminova

Koneva

et al. 2021

Russ. J. Inorg. Chem.

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Phase equilibria at 25°C in the KNO 3 -Ca(NO 3 ) 2 -H 2 O system were studied by the isothermal sections method. The phase diagram of the system was found to feature six phase fields, three monovariant lines, and two invariant points, the latter corresponding to a eutonic solution saturated with KNO 3 and KNO 3 ⋅Ca(NO 3 ) 2 ⋅3H 2 O and to a peritonic solution in equilibrium with Ca(NO 3 ) 2 ⋅4H 2 O and KNO 3 ⋅Ca(NO 3 ) 2 ⋅3H 2 O. The structure of the double salt was determined by X-ray structural analysis; its melting temperature and heat of melting were determined by differential scanning calorimetry (DSC) as ∆Н m = 132.2 kJ/kg, and T m = 52.1°С. The density of salt melts was measured at 60, 80, and 85°C. The thermophysical parameters of the double salt allow us to regard it as a promising heat storage material.

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Section: Methodsmentioning

confidence: 99%

Phase Equilibria in the KNO3–Ca(NO3)2–H2O System at 25°C

Кистанова

Mukminova

Koneva

et al. 2021

Russ. J. Inorg. Chem.

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Phase Equilibria in the KNO₃–KH₂PO₄–K₂SO₄–H₂O System at 298.2 K

Kistanova,

Shabanov,

Korotkikh

et al. 2024

J. Chem. Eng. Data

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Data regarding the solubility of salts in the KNO3–KH2PO4–K2SO4–H2O system can be used to optimize the composition of liquid complex fertilizers. This research considers phase equilibria in the quaternary system KNO3–KH2PO4–K2SO4–H2O at 298.2 K for the first time. A phase diagram with a plotted grid of isohydric lines was constructed based on the results of the experiment. The phase diagram displays a single quaternary invariant point, three ternary invariant points, three univariant curves, and three crystallization regions that correspond to KH2PO4, K2SO4, and KNO3. Among these, the crystallization region of K2SO4 is the largest, while that of KNO3 is the smallest. The order of decreasing solubility for the salts is KNO3 > KH2PO4 > K2SO4. No crystalline hydrates, double salts, or solid solutions were found in the system. The solution that is maximally saturated with salts corresponds to the quaternary invariant point.

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