Air separation process with waste recycle for nitrogen and oxygen production
CA 1280360 C · Owner: Roden, Thomas M. · Inventors: Roden, Thomas M.; Thorogood, Robert M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is an improved process for the production of nitrogen and oxygen that uses a double distillation column arrangement. The improvement to the process is the recycling of at least a portion of the oxygen-enriched waste stream to the bottom of the high pressure column. As a result of this improvement the process is capable of, making a nitrogen product with high purity (e.g. 5 ppm oxygen product) at high pressures (e.g. 40 to 150 psia) while simultaneously producing high purity oxygen (e.g. 99.6% oxygen). Nitrogen is produced only from the high pressure column.
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 February 19, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 19, 2008.
- 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.