Process for the hydrocyanation of unsaturated nitriles in dinitriles
CA 2134940 C · Owner: Rhone-Poulenc Chimie · Inventors: Perron, Robert; Huser, Marc
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention involves a process of hydrocyanation of ethenoid unsaturated nitriles into saturated dinitriles particularly the hydrocyanation of pentenenitriles into adiponitrile one of the basic compounds in the production of polyamide 66. More specifically it involves a process of hydrocyanation of an ethenoid unsaturated aliphatic nitrile by reaction with hydrocyanic acid in the presence of an aqueous solution of a catalyst consisting of a transition metal compound and a sulphonated phosphine. The process is characterized by the fact that the solution in question also contains a cocatalyst consisting of at least one Lewis acid.
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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
- Filed November 2, 1994 and granted August 11, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 2, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 2, 2016.
- 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.