тройная система

Phase Equilibria and Salting Out of Butyric Acid in the Sodium Chloride – Water – Butyric Acid Ternary System

Authors: Cherkasov D. G., Hrykina A. V., Umetchikov V. A., Smotrov M. P.

Phase equilibria in the water–butyric acid binary system in the range of −10÷0° C and in the sodium chloride–water–butyric acid ternary system in the range of 10.0÷60.0° C were studied using the visual polythermal method. The phase diagram of the water–butyric acid binary system at −9.5° C is characterized by eutectic equilibrium, the solid phases of which being ice and butyric acid crystals. The metastable delamination range was found on the ice crystallization field, bounded by a binodal curve with an upper critical solution temperature of −3.7° C.

Extractive Crystallization of Salt and Phase Equilibria in the Ternary System Sodium Nitrate – Water – Dipropylamine

Authors: Mezhueva M. A., Danilina V. V., Kurskii V. F., Cherkasov D. G.

Phase equilibria in the ternary system sodium nitrate – water – dipropylamine where the constituent binary liquid system is characterized by a trend to form a lower critical solution temperature (LCST) were studied using the visual-polythermal method in the range −10.0–90.0° C. It was found that the introduction of sodium nitrate into the water – dipropylamine system led to a significant decrease in the mutual solubility of the components.

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

Authors: Cherkasov D. G., Il’in K. K.

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.

Phase Equilibria in the Ternary System “Potassium Iodide – Water – Tert-Butyl Alcohol” within 5–30°C

Authors: Varlamova Т. М.

Studying of the influence of the salt nature and temperature on the liquid-liquid equilibrium in the ternary systems “salt – binary solvent” is topical for the development of the salting-in–salting- out theory. In addition, the ternary potassium iodide-water-alcohol systems are constituents of the quaternary iodine – potassium iodide – water – alcohol ones, studying of which is of practical interest in terms of determining the mixed solvent compositions with the highest iodine-dissolving power.

Phase Diagrams of the Ternary Systems Potassium Carbonate + Water + Hydrocarbon at 25°С

Authors: Il’in K. K., Cherkasov D. G., Kapustina D. V.

The phase diagrams of the ternary systems potassium carbo- nate+water+hydrocarbon (toluene, n.dodecane) at 25°С were first studied by means of the methods of sections and isothermal titration. The phase diagrams of both systems belong to those of ternary systems with salting-out of the binary heterogeneous system. Potassium carbon- ate sesquihydrate is the solid phase of monotectic equilibrium. Nine tie lines were drawn on the delamination field of the phase diagram of each ternary system.

СРАВНИТЕЛЬНАЯ ХАРАКТЕРИСТИКА ВЫСАЛИВАЮЩЕГО ДЕЙСТВИЯ НИТРАТОВ ЩЕЛОЧНЫХ МЕТАЛЛОВ НА ДВОЙНУЮ СИСТЕМУ ВОДА–ТРИЭТИЛАМИН

Authors: Il’in K. K., Cherkasov D. G.

Проведен сравнительный анализ результатов политермического
исследования высаливающего действия нитратов щелочных ме-
таллов (Na, K, Cs) на двойную систему вода – триэтиламин, ха-
рактеризующуюся расслаиванием с нижней критической темпе-
ратурой растворения (НКТР). Обнаружено, что нитраты щелочных
металлов, подвергающиеся в водно-органических растворителях
гомоселективной сольватации, понижают НКТР этой двойной си-
стемы, т. е. обладают высаливающим действием.
Установлено, что уменьшение радиуса катиона соли в ряду
CsNO3–KNO3–NaNO3

ДИАГРАММА РАСТВОРИМОСТИ ТРОЙНОЙ СИСТЕМЫ НИТРАТ КАЛИЯ–ВОДА–н-БУТОКСИЭТАНОЛ ПРИ 25.0 °C

Authors: Smotrov M. P., Жаркова И. С., Cherkasov D. G.

Методом сечений Мерцлина при 25.0 °С изучена диаграмма рас-

творимости тройной системы нитрат калия–вода–н-бутоксиэта-

нол. Установлено, что она относится к диаграммам тройных

систем с высаливанием. Экспериментально и графически

определен состав критической точки растворимости области

расслоения. На полях моновариантных состояний построены

13 нод, определены составы равновесных жидких фаз и рас-

считан коэффициент распределения н-бутоксиэтанола между