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Switchable solvents and methods of use thereof

United States Patent

April 29, 2014
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 (CA), Georgia Tech Research Corporation (Atlanta, GA)
13/ 969,984
August 19, 2013
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.