An enhanced 'first freezing point' method for solid-liquid-gas equilibrium measurements in binary systems

摘要

This work presents an enhanced method for solid-liquid-gas (SLG) phase equilibrium measurements in binary systems. The method is mainly based on the observation of the first freezing point. It consists of the formation of first solids from fluid phase(s) by means of slow temperature decreases. In this work, additionally to the observation of the appearance of first solids, SLG equilibrium measurements were confirmed through a pressure change when the solids were formed while temperature was still decreasing at constant volume. A data acquisition system was built to allow registration of both temperature and pressure in the static-view cell in real time.