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Switchable solvents and methods of use thereof

United States Patent

July 19, 2011
View the Complete Patent at the US Patent & Trademark Office
A solvent that reversibly converts from a nonionic liquid mixture to an ionic liquid upon contact with a selected trigger, e.g., contact with CO.sub.2, is described. In preferred embodiments, the ionic solvent is readily converted back to the nonionic liquid mixture. The nonionic liquid mixture includes an amidine or guanidine or both, and water, alcohol, or a combination thereof. Single component amine solvents that reversibly convert between ionic and non-ionic states are also described. Some embodiments require increased pressure to convert; others convert at 1 atmosphere.
Jessop; Philip G. (Kingston, CA), Eckert; Charles A. (Atlanta, GA), Liotta; Charles L. (Atlanta, GA), Heldebrant; David J. (Richland, WA)
Queen's University at Kingston (Kingston, CA), Georgia Tech Research Corporation (Atlanta, GA)
11/ 717,172
March 13, 2007
STATEMENT REGARDING FEDERALLY-SPONSORED RESEARCH AND DEVELOPMENT This invention was made with Government support under DE-FG02-99ER14986 contract awarded by the United States Department of Energy. The Government has certain rights in the invention.