Method for the combined production of ammonia and urea
CA 1238651 A · Owner: Linde Aktiengesellschaft · Inventors: Schramm, Walter; Ranke, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A description is given of a method for the combined production of ammonia and urea. An ammonia-synthesis gas consisting mainly of hydrogen, nitrogen and carbon-dioxide is subjected to pressurized washing, at temperatures equal to ambient temperature at the most, for the removal of acid contaminants, more particularly carbon-dioxide with a, physically acting solvent. The charged solvent is partly expanded for gassing out co-absorbed inerts is then regener-, ated without pressure is returned to the pressurized wash, and the carbon-dioxide released during regeneration is used to synthesize urea. In order to be able to release this carbon-dioxide, in an energy-saving manner and pre-compressed …
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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
- Granted June 28, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 28, 2005.
- 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.