Process for purifying and recovering the contaminated catalyst solution arising in the carbonylation of methanol and/or methyl acetate and/or dimethyl ether
CA 2012567 C · Owner: Erpenbach, Heinz · Inventors: Prinz, Peter; Lork, Winfried; Erpenbach, Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the process for purifying and recovering the contaminated catalyst solution arising in the carbonylation of methanol and/or methyl acetate and/or dimethyl ether and containing carbonyl complexes of rhodium quaternary, organophosphorus compounds as organic promoters undis-, tillable organic impurities as well as acetic acid acetic anhydride and ethylidene diacetate the carbonyl, complex of rhodium as well as acetic acid acetic an-, hydride and ethylidene diacetate are extracted from the contaminated catalyst solution by means of a tri-C3- to C8-alkylphosphane and the trialkylphosphane phase is separated from the promoter phase freed of rhodium and containing the organic impurities; the …
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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
- Filed March 20, 1990 and granted August 30, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 20, 2012.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.