двойная система

Phase diagram of the β-alanine – water binary system

Authors: Cherkasov D. G., Parfenova V. D.

The phase diagram of the β-alanine–water binary system was studied using the visual polythermal method and the method of time–temperature curves in а temperature range of -20–90°С. There is a eutectic equilibrium at -18.3°С in the system; the solid phases of this equilibrium are ice and individual β-alanine. For the first time, the composition of the liquid phase of the eutectic state was determined.

Phase Equilibria and Component Solubility in the Binary System Water + Dipropylamine

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

Dipropylamine is one of the promising antisolvents for extractive salt crystallization, but its solubility in water and phase equilibria in its aqueous solutions over a wide temperature range has not been studied in detail until now. The review of the literature shows that the water-dipropylamine system is classified as a self-separating system with a lower critical solution temperature (LCST). We used the visual-polythermal method in a –25–90°C range to study phase equilibria in the binary system water-dipropylamine and to plot the phase diagram of the system.

Phase Equilibria and Critical Phenomena in the Water–i-Butyric Acid Binary System

Authors: Smotrov M. P.

Phase equilibria and critical phenomena in the water-i-butyric acid binary system were studied by the visual polythermal method over the temperature range –10–30°C. The system is characterized by delamination with an upper critical solution temperature (UCST) equal 25.8°C. In the system at –1.8°C, these occurs a nonvariant monotectic equilibrium whose solid phase are ice crystals. The phase diagram of the system is plotted.

Phase Diagram of the Potassium Thiocyanate – Water Binary System

Authors: Il’in K. K., Cherkasov D. G.

The phase diagram of the potassium thiocyanate–water binary system was studied by the visual polythermal method and by the method of time–temperature curves over а temperature range – 35–180 оС. There is an eutectic equilibrium at –32.6 оС in the system; the solid phases of this equilibrium are ice and individual potassium thiocyanate. The composition of the liquid phase of the eutectic state was determined.

Фазовые равновесия и критические явления в двойной системе вода–н-бутиловый спирт

Authors: Il’in K. K., Севрюгин А. В., Cherkasov D. G.

Визуально-политермическим методом в интервале – 10–125 oС изучены фазовые равновесия и критические явления в двойной системе вода–н-бутиловый спирт. Система характеризуется расслаиванием с верхней критической температурой растворения (ВКТР), равной 124.4 oС. При –2.4 oС в системе осуществляется нонвариантное монотектическое равновесие, твердой фазой которого являются кристаллы льда. Построена фазовая диаграмма системы.