Process for urea production
CA 1329625 C · Owner: Zardi, Umberto · Inventors: Zardi, Umberto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the production of urea from ammonia and carbon dioxide via synthesis where the urea formation takes place in a synthesis zone (or zones) in which an excess of free ammonia is kept to favour high conversions, said synthesis zone (or zones) being followed by an ammonia separation and direct recycle to the reaction step where the urea, solution from said reaction zone (or zones) is intimately contacted for a short duration time with a minor portion of the fresh CO2. The separation step is followed by a CO2 stripping step where the residual carbamate is removed using a countercurrent fresh CO2 stream.
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 May 17, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 17, 2011.
- 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.