Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2005-02-01
2005-02-01
Hopkins, Robert A. (Department: 1724)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C423S633000
Reexamination Certificate
active
06849187
ABSTRACT:
Disclosed is a heavy metal removal media containing ferric hydroxide having unique levels of microporosity and mesoporosity/macroporosity, and/or a specific average particle size and/or granule size. The ferric hydroxide is made by simultaneously combining in a vessel at least one iron salt and at least one hydroxide compound, and then recovering the ferric hydroxide. The ferric hydroxide made by simultaneous mixing is effective in removing heavy metals, such as arsenic, from aqueous systems.
REFERENCES:
patent: 4515756 (1985-05-01), Blumer
patent: 5053139 (1991-10-01), Dodwell et al.
patent: 5071587 (1991-12-01), Perman
patent: 5254516 (1993-10-01), Gupta et al.
patent: 5296438 (1994-03-01), Heung
patent: 5569445 (1996-10-01), Fukatsu et al.
patent: 5603838 (1997-02-01), Misra et al.
patent: 6030537 (2000-02-01), Shaniuk et al.
patent: 6342191 (2002-01-01), Kepner et al.
patent: 20020074292 (2002-06-01), Schlegel et al.
patent: WO 8303595 (1983-10-01), None
patent: 9637438 (1996-11-01), None
patent: 9950182 (1999-10-01), None
patent: 0154786 (2001-08-01), None
patent: 0226630 (2002-04-01), None
patent: 0226631 (2002-04-01), None
patent: 0226632 (2002-04-01), None
patent: 0226633 (2002-04-01), None
patent: WO 0247811 (2002-06-01), None
Gupta, et al.; “Arsenic Removal by Adsorption”; Mar. 1978; pp. 493-506.
Anderson, et al.; “Arsenate Adsorption on Amorphous Aluminum Hydroxide”; Journal of Colloid and Interface Science, vol. 54, No. 3, Mar. 1976; pp. 391-399.
Gulledge, et al.; “Removal of Arsenic (V) From Water by Adsorption on Aluminum and Ferric Hydroxides”; Journal Water Technology/Quality J-AWWA; Aug. 1973; pp. 548-552.
Raven Klaus P et al: “Arsenite and Arsenate Adsorption on Ferrihydrite: Kinetics, Equilibrium, and Adsorption Envelopes”. Environmental Science and Technology, vol. 32, No. 3, Feb. 1, 1998, pp. 344-349, XP002276906 ISSN: 0013-936X—p. 344-p. 345, left-hand column.
Engelhard Corporation
Hopkins Robert A.
Lindenfeldar Russell G
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