Process for the recovery of substituted phosphines and active rhodium
CA 1106858 A · Owner: Davy International (Oil & Chemicals) Limited · Inventors: Shevels, Thomas F.; Harris, Norman
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydroformylation process is disclosed utilising a rhodium complex catalyst and an excess of a triorganophosphine wherein active rhodium catalyst and triorganophosphine can be separated from inactive rhodium "heavies" and triorganophosphine oxide in partially deactivated reaction medium by extraction into concentrated phosphoric acid or aqueous solutions containing at least 40% by weight phosphoric acid. By neutralisation of the phosphoric acid extract in the presence of organic solvent e.g. aldehyde trimers, a solution of active rhodium catalyst and triorganophosphine can be produced that is suitable for re-use in the hydroformylation reaction.
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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 August 11, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 11, 1998.
- 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.