Gas separation
CA 1268428 C · Owner: Imperial Chemical Industries Plc · Inventors: Johnson, John Brian Hansen; Pinto, Alwyn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Gas separation, A raw ammonia synthesis gas preferably containing, an excess of nitrogen is converted to synthesis ready, ammonia synthesis gas by two pressure swing adsorption (PSA) stages operated in succession. If the raw gas contains carbon monoxide this is chemically removed eg by, methanation between the PSA stages. In the first PSA stage CO2 is removed and waste gas from the second PSA stage is preferably fed back to the first PSA stage for sweeping purging or repressurising. In a preferred system the first PSA cycle includes a sweep with CO2-rich gas prior to depressurisation and purge with second PSA waste gas. In the second PSA stage inert medium boiling gases and any unwanted, …
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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 May 1, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 1, 2007.
- 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.