Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1996-07-26
1998-08-11
Drodge, Joseph W.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210639, 210912, 423 8, 423 215, B01D 1100, B01D 1102
Patent
active
057923574
ABSTRACT:
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.
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Lin Yuehe
Smart Neil G.
Wai Chien M.
Drodge Joseph W.
Idaho Research Foundation Inc.
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