Determination of Melting Point of Ionic Salts in the Presence of High Pressure CO2 by Capillary Method (CAT#: STEM-PPA-0047-YJL)

Introduction

In recent years, ionic liquids and supercritical fluids have received attention as solvents for sustainable processes. They are both more environmentally acceptable than volatile organic solvents, and they are both tunable solvents – the properties of ionic liquids can be adjusted to the specific need by varying the cation/anion combination, and CO2 properties by varying pressure.
Several properties of ionic liquids and supercritical CO2 are complementary, which is precisely the reason why they combine into a biphasic reaction medium with various advantages.
Recently, another intriguing aspect of their phase behaviour was discovered – that dissolution of CO2 into an ionic liquid-like salt, solid at room temperature, can have a dramatic influence on its melting behaviour. High pressure gases were known to induce melting point depressions of organic substances, up to a certain pressure, with melting point increasing again at higher pressures.