Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Platinum group metal
Reexamination Certificate
2005-05-10
2005-05-10
Bos, Steven (Department: 1754)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Platinum group metal
C423S024000, C210S684000
Reexamination Certificate
active
06890496
ABSTRACT:
Selective extraction of one or more metal anions from an aqueous solution, by contacting the aqueous solution with an organic solution including a diquaternary amine, wherein the diquaternary amine has two diquaternary nitrogens spaced at a distance of less than about 10 Å, selectively binding the metal anions to the diquaternary amine, and then separating the organic solution from the aqueous solution, wherein the diquaternary amines having the selectively bound metal anions are concentrated in the organic solution. Alternatively, the diquaternary amines may be adsorbed or chemically bonded to a solid, and the metal anion-containing aqueous solution passed over the solid having the diquaternary amines. Palladium may be selectively extracted by contacting the acidic solution with an iodide and an organic solvent, allowing the palladium to bind to the iodide, and then separating the organic solution from the aqueous solution, concentrating the bound palladium ions in the organic solution.
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Singh Waheguru Pal
Sylvester Paul
Bos Steven
Campigotto Frank J.
Lynntech Inc.
Streets Jeffrey L.
Streets & Steele
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