291348 Using Structure-Property Relationships to Develop Reversible Ionic Liquids for CO2 Capture

Monday, October 29, 2012
Hall B (Convention Center )
Ashley Bembry1, Elizabeth Biddinger1, Kyle Flack2, Emily Nixon2, Amy Rohan1, Amber C. Rumple2, Myoung-Geun Song2, Jackson Switzer1, Pamela Pollet2, Charles Liotta2 and Charles Eckert1, (1)School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, (2)School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA

The capture and sequestration of CO2 from flue gas streams is essential to mitigating the levels of CO2 in the atmosphere that contribute to global warming. Non-aqueous silylamine solvents were designed at a molecular level to obtain specific physical properties in order to achieve effective CO2 capture. These relatively non-polar solvents, upon selective reaction with CO2, reversibly form ionic liquids. These reversible ionic liquids can capture additional CO2 through physical absorption owing to high CO2 solubility in the ionic liquid state. The reaction is equilibrium governed allowing for reversibility and control over the extent of reaction with CO2. CO2 is released upon moderate heating of the reversible ionic liquid or by sparging with an inert gas. The effects of changes in structure on (1) the CO2 capture capacity, (2) the viscosity of the solvent systems at partial and total conversion to the ionic liquid state, (3) the temperature of solvent regeneration and (4) the temperature of solvent evaporation are reported.

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