Continuous process for extracting nitrates from nitrate-containing solutions
CA 1052019 A · Owner: Kemira Oy · Inventors: Lehto, Timo K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A continuous process for removing nitrates from nitrate containing solutions having a pH of about 0-7 preferably about, 1.3 - 6.0, by extracting the nitrate containing solution with an organic amine salt dissolved in an organic solvent; adjusting the pH of the organic extraction solvent phase emerging from the extraction at a value of about 0.5 at minimum preferably, 0.6 - 2.5; stripping the organic extraction solvent phase from the extraction with a saline solution to strip and reconvert the amine for the next extraction cycle into the same amine salt as used for the extraction; maintaining the concentration of the salt formed by the cation of the stripping salt and the nitrate anion in …
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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 April 3, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 3, 1996.
- 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
Timeline From CIPO dates
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.