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Topological Transformation of Phase Diagram for Сut 2 of the Composition Tetrahedron of the Quaternary Potassium Nitrate – Water – Pyridine – Butyric Аcid System within 5–60°С

Phase equilibria and critical phenomena in component mixtures of the cut 2 of the composition tetrahedrone of the quaternary system potassium nitrate + water + pyridine + butyric acid whose constituent ternary liquid system had a closed binodal curve were studied by means of the visual-polythermal method within 5– 60°C. We first proposed a method to find the coordinates of the end point of the critical tie line of monotectic state in quaternary systems salt + three solvents.

Equilibrium Liquid–Liquid–Solid and Critical Phenomena in the Quaternary System Cesium Nitrate+Water+Pyridine+Butyric Acid with in the Range of 5 to 60°C

Phase equilibria and critical phenomena in the component mixtures of a cut of the composition tetrahedron of the quaternary system cesium nitrate + water + pyridine + butyric acid were studied in the range of 5–60°C by the visual-polythermic method. The phase equilibria in the component mixtures were studied using sections of one cut of the composition tetrahedron. The cut position was chosen in such a way as to cross all figures of the phase states with the presence of a solid phase in order to observe the phase behavior of the monotectic state figure as temperature changes.

Фазовые равновесия и критические явления в тройной системе иодид калия – вода – пиридин

Визуально-политермическим методом изучены фазовые равновесия и критические явдения в тройной системе иодид калия–вода–пиридин в интервале 60–145°С. Определены температура образования критической ноды монотектического состояния (132.8°С) и составы растворов, соответствующие критическим точкам растворимости при различных температурах. Построены изотермические фазовые диаграммы системы и рассчитаны коэффициенты распределения пиридина между водной и органической фазами монотектического состояния при различных температурах.