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Scholars Day 2005, Wednesday, April 13

Phase Behavior of Ionic LIquids in CO2: Developing Green Solvents

Supercritical carbon dioxide (scCO2) and ionic liquids (IOL) are both environmentally friendly solvents, and scCO2 and IOL are good solvents for non-polar and polar reactants, respectively. A mixed solvent system of scCO2 and IOL would be a great solvent for a multitude of reactions and could potentially eliminate the use of hazardous solvents. The phase behavior of scCO2 and IOL was studied to find the conditions of pressure and temperature necessary for the mixed solvent system. The IOL that we are studying is trihexyl(tetradecyl)phosphonium chloride. We will present phase diagrams to show the conditions for mixed solvent systems at fixed concentrations of IOL and scCO2. Evidence that this IOL did indeed dissolve into CO2 was obtained from 1H NMR. In an independent experiment, we have determined the amount of various gases that this IOL can absorb. The data presented will show the amount of N2, Ar, He, and CO2 that is absorbed.

Presenter: James Hutchings (Undergraduate Student)
Topic: Chemistry
Location: 140 Lennon
Time: 10:45 am (Session II)