Removal of sulfur dioxide
CA 1332372 C · Owner: Stauffer, John E. · Inventors: Stauffer, John E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is disclosed for removing sulfur dioxide from a waste gas stream such as effluent vent of flue gas for purposes, of economy, for achieving a useful by-product and for minimizing, environmental pollution. The gas is scrubbed with an aqueous sulfuric acid stream to convert the sulfur dioxide to sulfurous acid. The acid stream containing the sulfurous acid is subjected to electrolysis to oxidize the sulfurous acid to sulfuric acid. The acid stream resulting from the electrolysis step is recycled to repeat the scrubbing and electrolysis steps in a continuous cycle, while maintaining the concentration of the acid stream by means of make-up water and acid.
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 October 11, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 11, 2011.
- 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.