Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2005-10-04
2005-10-04
Silverman, Stanley S. (Department: 1754)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C075S722000, C556S118000, C556S138000
Reexamination Certificate
active
06951960
ABSTRACT:
A method for regenerating an amine extractant used for recovery of metals involves contacting a liquid organic phase containing an amine complexed with one or more metals with an aqueous solution substantially free of chloride ions to strip the one or more metals from the organic phase. The stripped organic phase is then contacted with a solution of hydrochloric acid to regenerate the amine extractant which can then be recycled in a production process.
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McDonald, C., et al., “Removal of Zinc Ions from Aqueous Chloride Soultions by Solvent Extraction Using Alamine 308”, Separation Science and Technology, 14(9), pp. 741-747, 1979.
Inco Limited
Silverman Stanley S.
Steen Edward A.
Strickland Jonas N.
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