Process for scrubbing ammonia and hydrogen sulfide from a fluid acid stream
CA 2226023 A1 · Owner: Colt Engineering Corporation · Inventors: Razzaghi, Minoo; Kresnyak, Steve
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for scrubbing ammonia from refinery gas streams and other such streamsis disclosed. The process involves the removal of hydrogen sulfide as a first step from the stream with subsequent recovery of the hydrogen sulfide. The ammonia is ionized by the introduction of a strong acid, an example of which is sulfuric acid to render the ammonia, ammonium. A product of the reaction in ammonium sulfate which can be immediatelyvended as a fertilizer grade product. Significant advantages in the process relate to a greater than 90% recovery of ammonia and substantially reduced levels of hydrogen sulfide in the fertilizer product. This is marked advantage over the prior art methods which …
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 December 31, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 31, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 31, 2019.
- 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.