Continuous method for producing aromatic amines
CA 2306935 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Beckhaus, Heiko; Langer, Reinhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a continuous method for producing aromatic diamines and/or polyamines by means of catalytic hydrogenation of corresponding aromatic dinitro and/or polynitro compounds with hydrogen. The invention is characterized in that in a reactor with a catalytic fixed bed or shower bed with a pressure ranging from 5 to 100 bar and at a reaction temperature ranging from 100 to 220 ~C, a) the aromatic dinitro and/or polynitro compounds are optionally introduced in the presence of a solvent in a product stream comprised of an essentially recycled hydrogenated product water and hydrogen, and b) a part of the product stream is continuously withdrawn from the reactor system.
Read the whole patent
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 October 2, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2020.
- 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.