Mercury removal in utility wet scrubber using a chelating agent
CA 2285162 C · Owner: Amrhein, Gerald T. · Inventors: Amrhein, Gerald T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for capturing and reducing the mercury content of an industrial flue gas such as that produced in the combustion of a fossil fuel or solid waste adds a chelating agent such as ethylenediaminetetracetic acid (EDTA) to the flue gas being scrubbed in a wet scrubber used in the industrial process. The EDTA prevents the reduction of oxidized mercury to elemental mercury thereby increasing the mercury removal efficiency of the wet scrubber. Tests on inlet and outlet mercury concentration in an industrial flue gas were performed without and with EDTA addition. Without EDTA mercury removal totaled 42%. With EDTA mercury removal increased to 71%.
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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
- Filed October 6, 1999 and granted December 3, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 6, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2021.
- 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.