Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2007-10-16
2007-10-16
Barry, Chester T. (Department: 1724)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C210S666000, C210S912000, C210S688000
Reexamination Certificate
active
10683614
ABSTRACT:
The present invention provides a method for removing selenium from an aqueous stream by passing the aqueous stream, in combination with a quaternary amine compound, through a filter and recovering a treated aqueous stream which is depleted in selenium content relative to the untreated aqueous stream. The present method removes selenium from an aqueous refinery stream by passing the aqueous stream, in combination with a quaternary amine compound, through a filter that can include clay, cellulose, starch, activated carbon, and the like.
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Jeffrey J. Smith et al., Produced Water Polishing, Filtration and Filter Monitoring System Promotes Compliance During Conventional Treatment Upsets, CETCO Offshore—Technology Paper Dec. 2002, pp. 1-8.
Barry Chester T.
Chevron U.S.A. Inc.
Roth Steven H.
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