Phase Equilibrium Properties of Supercritical Carbon Dioxide in Binary System

The Performance of supercritical fluid (SCF) as a solvent can be greatly affected by addition of an entrainer to the system. In this study, the constant volume visual method is used to measure the critical point properties of CO2 + toluene, CO2 + cyclohexane, CO2 + n-butyraldehyde, CO2 + i-butyraldehyde, CO2 + methanol and CO2 + ethanol binary systems. These properties provide a good basis for supercritical extraction and chemical reaction. The relationship between the critical point of CO2 + entrainer binary system and the critical point of supercritical carbon dioxide has been discussed. The phase behavior of single component system has been compared to that of CO2 + entrainer binary systems.