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US 4,382,016 AGranted
Extractant for the selective removal of cobalt(II) from aqueous solutions
AssigneeAmerican Cyanamid Company
InventorsWilliam A. Rickelton, Allan J. Robertson, David R. Burley
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Abstract
Cobalt(II)-bearing aqueous solutions may be treated with an extractant comprising an organic-soluble phophinic acid, or a salt thereof, to separate the cobalt(II) from the aqueous solution. Typical extraction techniques compatible with the instant process include liquid-liquid extraction employing either mixer settlers or columns, packed beds of supported extractants as in ion exchange, liquid membrane extraction and selective supported membrane extraction.
Claims3
A composition for use in extraction comprising an inert material whereupon an organophosphinic acid of the structure:
- ##STR4## is adsorbed entrained or chemically bound wherein R.sub.1, R.sub.2 are individually substituted or unsubstituted alkyl, cycloalkyl, alkoxyalkyl, alkylcycloalkyl, aryl, alkylaryl, aralkyl or cycloalkylaryl radicals and X is either hydrogen or a salt-forming radical.
Dependencies are inferred from the claim text.