Catalytic hydrogenation of di(4-aminophenyl)methane
CA 1190565 A · Owner: Mobay Chemical Corporation · Inventors: Allen, Gary F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an improved process for the catalytic hydrogenation of di(4-aminophenyl) methane to a liquid di(4-aminocyelohexyl) methane mixture containing from 15 to 40% by weight of the trans trans, isomer. The invention resides in the use of a rutheniumon-alumina catalyst, the use of an aliphatic alcohol during hydrogenation and the use of ammonia during hydrogenation, with the hydrogenation being conducted under specific process conditions. The hydrogenation reaction is conducted for no more than about sixty minutes at a temperature of from 150 to 217°C and at a hydrogen pressure of at least 500 psi.
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
- Granted July 16, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 16, 2002.
- 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.