Process and composition for the removal of hydrogen sulfide and/or carbon dioxide from gaseous streams
CA 1305464 C · Owner: The Dow Chemical Company · Inventors: Jeffrey, Gaines C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process of removing hydrogen sulfide and/or carbon dioxide from a sour gaseous stream in a contact zone by contacting the sour gaseous stream with a H2Sand/or CO2-selective absorbent in an aqueous alkaline solution containing a polyvalent metal chelate at a pH of 7 to 10 wherein the polyvalent metal chelate is in one embodiment of the invention in the reduced or lower valence state in a contact zone and is oxidized to the oxidized or higher valence state in an oxidation zone so as to convert hydrosulfide and/or sulfide salts present in the contact zone to sulfur. In a second embodiment, the aqueous alkaline solution and H2Sand/or CO2-selective absorbent in contact with the gaseous stream …
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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 July 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 21, 2009.
- 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.