Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Platinum group metal
Reexamination Certificate
2007-02-13
2007-02-13
Boss, Steven (Department: 1754)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Platinum group metal
C423S024000, C210S684000
Reexamination Certificate
active
10758300
ABSTRACT:
Selective extraction of a metal anion complex, such as a platinum-group metal halide, from an aqueous solution containing other metal anions or anion complexes, by contacting the solution with a diquaternary ammonium salt having two quaternary nitrogens spaced at a distance less than about 10 Å, selectively binding the metal anion complex to the diquaternary ammonium salt to form an organo-metallic complex, and separating the organo-metallic complex from the solution. Alternatively, the diquaternary ammonium salts may be adsorbed or chemically bonded to a substrate, and the metal anion complex-containing solution passed over the substrate. Preferably, the two quaternary nitrogens are spaced a distance apart that is complementary to the ionic diameter of the target metal anion complex. Typically, the platinum group metal halide anion complexes have a valence of −2 and each of the two quaternary nitrogens of the diquaternary ammonium salt have a valence of +1, such that the organo-metallic complex formed is a stable pair.
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Boss Steven
Lynntech Inc.
Streets Jeffrey L.
Streets & Steele
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