Process for selectively removing hydrogen sulfide
CA 1249421 A · Owner: The Dow Chemical Company · Inventors: Kent, Van A.; Kirby, Larry H.; Abib, Roberto A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hydrogen sulfide is removed from gas streams containing it with or without carbon dioxide by contacting the gas feed stream with an aqueous liquid containing sulfide and bisulfide ions and having a pH in the range from 9 to 12 to remove a minor portion of the hydrogen sulfide and then removing the remainder with an aqueous liquid containing sulfide and bisulfide ions having a higher pH in the range from 11 to 13.5.
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 January 31, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 31, 2006.
- 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.