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Method and apparatus for back-extracting metal chelates

United States Patent

5,792,357
August 11, 1998
View the Complete Patent at the US Patent & Trademark Office
A method of extracting metal and metalloid species from a solid or liquid substrate using a supercritical fluid solvent containing one or more chelating agents followed by back-extracting the metal and metalloid species from the metal and metalloid chelates formed thereby. The back-extraction acidic solution is performed utilizing an acidic solution. Upon sufficient exposure of the metal and metalloid chelates to the acidic solution, the metal and metalloid species are released from the chelates into the acid solution, while the chelating agent remains in the supercritical fluid solvent. The chelating agent is thereby regenerated and the metal and metalloid species recovered.
Wai; Chien M. (Moscow, IA), Smart; Neil G. (Moscow, IA), Lin; Yuehe (Moscow, IA)
Idaho Research Foundation, Inc. (Moscow, ID)
08/ 692,894
July 26, 1996
ACKNOWLEDGEMENT OF GOVERNMENT SUPPORT This invention was funded in part by the United States Department of Energy under grant CC-S-588193-002-C; the United States government has certain rights in the invention.