Continuous preparation of secondary amines from nitriles using cobalt and zirconium
CA 2039925 A1 · Owner: Texaco Chemical Company · Inventors: Zimmerman, Robert Leroy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
CONTINUOUS PREPARATION OF SECONDARY AMINES FROM NITRILES USING COBALT AND ZIRCONIUM (D#80,918-F), Abstract of the Disclosure A method for producing secondary amines particularly fatty, secondary amines such as ditallowamine from fatty nitriles such as tallow, nitrile over a cobalt catalyst promoted with zirconium has been discovered. The catalyst may be supported on kieselguhr or other support. The reaction gives high selectivity of secondary amine over the coproduced primary and tertiary amines. The reaction may be conducted continuously in the presence of ammonia and hydrogen. The secondary amine proportion may be increased by a second stage using the same catalyst as the first stage, but …
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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 April 5, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 5, 2013.
- 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.