Possibilities of heat pulse probing method for determining the phase diagram of partially-miscible liquid mixtures

In the course of this research, the liquid-liquid equilibrium line for binary solutions characterized by the upper critical solution temperature was developed by the traditional method of visual observation and the method of heat pulse probing. The objects of study were solutions of perfluoromethylcyclohexan/hexene-1 and perfluorodimethylcyclohexan/hexene-1. Heat pulse probing mode was found, which allows us to recognize the approaching to the temperature of liquid-liquid phase separation. The possibility of pulse technique with a characteristic time of several milliseconds to determine the phase state and estimate the actual concentration of solutions in opaque vessels was revealed.