Process for selectively stripping iron ions from an organic solvent
CA 1207151 A · Owner: Solex Research Corporation Of Japan · Inventors: Watanabe, Morio; Nishimura, Sanji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is concerned with a process for selectively stripping iron ions into an aqueous phase from an organic solvent containing iron and zinc ions and one or more compounds selected from the group consisting of alkyl phosphoric acid, alkyl-aryl phosphoric acid alkyl thio phosphoric, acid, and alkyl-aryl thio phosphoric acid together with a petroleum hydrocarbon as a diluent for the organic solvent. The process of the invention comprises contacting the organic solvent with an aqueous solution containing NH4 + and F- ions to selectively strip the iron ions into the aqueous solution.
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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 July 8, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 8, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.