Process for the separation of amides from nitriles
CA 1260495 A · Owner: Akzona Incorporated · Inventors: Frank, Dieter; Park, John Y.G.; Metcalfe, Lincoln D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the removal of impurities comprising amides from a solution comprising nitriles and the impurities. A reaction mixture is formed which includes the solution a layered, mineral comprising aluminum silicates having exchangeable alkaline or alkaline earth cations on the surfaces of the layers and an acid which has an acid strength sufficient to protonate the amides at amide protonation conditions, but in which the solubility of the salt of the acid and exchangeable cation at those conditions is such that the equilibrium of the protonation reaction is substantially in the direction of the amides remaining in a protonated form. The water content of the reaction mixture must be less …
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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 September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 2006.
- 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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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.