Regeneration of organic extractants containing alpha hydroxyoximes
CA 1111825 A · Owner: Amax Inc. · Inventors: Leaver, Helen S.; Freiser, Henry; Davis, Phillip K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An organic liquid extractant of at least one oxime selected from the group consisting of ketoximes and .alpha. hydroxyoximes dissolved in an organic solvent useful in, separating nickel from cobalt in process solutions or in recovering both nickel and cobalt from process solutions is, treated with a salt of hydroxylamine at intervals to maintain the activity of the oxime in the extractant. The organic extractant can also contain sulfonic acids to facilitate treatment of more acid process solutions and is treated with a hydroxylamine salt to regenerate oxime degraded by the highly acid process solutions, the extractant itself and the concentrated acidic stripping solutions. (1)
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted November 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.