Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Reexamination Certificate
2008-05-20
2008-05-20
Hruskoci, Peter A. (Department: 1797)
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
C175S066000, C210S711000, C210S712000, C210S719000, C210S727000, C210S730000, C210S735000
Reexamination Certificate
active
07374690
ABSTRACT:
Processes for removing oil from a solid wellbore material such as drill cuttings or water such as produced by a subterranean formation include contacting the solid material/water with an amino-substituted polymer such as chitosan and a halogenating agent. The oil separates from the solid material and becomes bound within a flocculated solid. The flocculated solid containing the oil subsequently may be combined with a solvent of the amino-substituted polymer. Further, the flocculated solid may be contacted with a reducing agent, converting the flocculated solid back into the amino-substitute polymer and forming an oil-phase separate from the solvent-phase. The oil-phase may then be separated from the solvent phase and recovered. The solvent in which the amino-substituted polymer is dissolved may be recycled for treating more solid material removed from the well bore.
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Office Action on U.S. Appl. No. 10/915,023 dated Sep. 14, 2006.
Conley & Rose, P.C.
Halliburton Energy Service,s Inc.
Hruskoci Peter A.
Roddy Craig W.
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