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Polymers for metal extractions in carbon dioxide

United States Patent

January 23, 2001
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
A composition useful for the extraction of metals and metalloids comprises (a) carbon dioxide fluid (preferably liquid or supercritical carbon dioxide); and (b) a polymer in the carbon dioxide, the polymer having bound thereto a ligand that binds the metal or metalloid; with the ligand bound to the polymer at a plurality of locations along the chain length thereof (i.e., a plurality of ligands are bound at a plurality of locations along the chain length of the polymer). The polymer is preferably a copolymer, and the polymer is preferably a fluoropolymer such as a fluoroacrylate polymer. The extraction method comprises the steps of contacting a first composition containing a metal or metalloid to be extracted with a second composition, the second composition being as described above; and then extracting the metal or metalloid from the first composition into the second composition.
DeSimone; Joseph M. (Chapel Hill, NC), Tumas; William (Los Alamos, NM), Powell; Kimberly R. (Chapel Hill, NC), McCleskey; T. Mark (Los Alamos, NM), Romack; Timothy J. (Durham, NC), McClain; James B. (Raleigh, NC), Birnbaum; Eva R. (Los Alamos, NM)
09/ 185,891
November 4, 1998
This invention was made with Government support under Contract Number W-7405-ENG-36 from the Department of Energy. The Government has certain rights to this invention.