C - Chemistry – Metallurgy – 12 – N
Patent
C - Chemistry, Metallurgy
12
N
C12N 11/12 (2006.01) B01J 13/02 (2006.01) B01J 13/06 (2006.01) B01J 20/24 (2006.01) B01J 20/26 (2006.01) B01J 20/28 (2006.01) B01J 20/32 (2006.01) C02F 1/26 (2006.01) C02F 1/28 (2006.01) C02F 1/52 (2006.01) C12N 11/04 (2006.01) C12N 11/08 (2006.01) C22B 3/18 (2006.01)
Patent
CA 2044167
Toxic metal contaminants dissolved in dilute aqueous solutions such as waste waters are removed by contact with water in- soluble polymeric beads having an internal pore structure containing immobilized extractant material capable of sorbing the me- tal contaminants. The beads are prepared by forming a solution of a polymeric material in an organic solvent, blending the ex- tractant into the solution and injection the solution through a nozzle into water to form beads. The polymeric material is preferably polysulfone or cellulose acetate, and the extractant may be yeast, algae, penicillium mold, xanthan gum, guar gum, al- ginate, common duckweed (Lemna sp.) or a chemical compound. A metal of value can be separated from the extractant by using dilute mineral acids or other dilute solutions to solubilize the metal.
Jeffers Thomas H.
Seidel Don C.
Gowling Lafleur Henderson Llp
U.s. Department Of Commerce United States Of America Represented By The Secretary
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