Combined process for the treatment of waste solutions and sulfur containing gases
CA 1075442 A · Owner: Pittsburgh Environmental And Energy Systems · Inventors: Bramer, Henry C.; Shapiro, Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention discloses a combined process for the removal of sulfur dioxide from waste stack gases and for the treatment of industrial waste acid solutions containing salts thereof which are capable of being converted to sulfides with minimum formation of sulfites or bisulfates these salts, including one or more of the mineral acid salts of iron. The inventive process includes the step of treating the waste acid solution to convert the iron salts contained therein to iron sulfide. An aqueous slurry containing 0.1 to 50% of the iron sulfide then is contacted with sulfur dioxide-containing stack gases, in a scrubber, at a pH of 5.5 to 6.5 and at a temperature of 100° to 150°F. to remove the …
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 April 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 15, 1997.
- 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.