Method for recovering vanadium from residues from the combustion of petroleum fractions
CA 1297680 C · Owner: Di Pasquale, Sebastiana · Inventors: Primerano, Patrizia; Zipelli, Cesare; Corigliano, Francesco
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is described for recovering vanadium from residues from the combustion of petroleum fractions wherein, the residues, such as ash and soot are leached with aqueous, H2SO4 to extract vanadium and any additional polyvalent cations contained therein. The acid leaching solution after, oxidation of the extracted cations is treated with a, complexing agent, in particular EDTA or salts thereof and, then with ammonia to selectively precipitate vanadium as highly pure ammonium polyvanadate.
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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 March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 2009.
- 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.