Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2005-03-08
2005-03-08
Hruskoci, Peter A. (Department: 1724)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C210S667000, C210S668000, C210S683000, C210S714000, C210S721000, C210S726000, C210S911000, C423S087000
Reexamination Certificate
active
06863825
ABSTRACT:
Arsenic is removed from water and other aqueous feeds by (1) treating the feed with a compound containing cerium in the +4 oxidation state, preferably cerium dioxide, to oxidize arsenic in the +3 oxidation state to arsenic in the +5 oxidation state and (2) removing the arsenic in the +5 oxidation state from the aqueous phase, normally by contacting the treated feed with alumina or other precipitating agent containing cations in the +3 oxidation state.
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Burba, III John Leslie
McNew Edward Bayer
Witham Richard Donald
Finkle Yale S.
Hruskoci Peter A.
Union Oil Company of California
Wirzbicki Gregory F.
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