Process for continuously producing an anhydrous methyl acetate/methanol mixture
CA 2012006 C · Owner: Celanese Chemicals Europe Gmbh · Inventors: Erpenbach, Heinz; Gunther, Klaus; Kohl, Georg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for continuously producing an anhydrous methyl acetate/methanol mixture by esterifying acetic acid and methanol in the presence of an acidic esterification catalyst is indicated, which comprises carrying out the esterification in a distillation column having n = 20 to 50 distillation trays, a) the acetic acid being fed together with the catalyst to a distillation tray which is at a distance of 0.5 n to 0.8 n from the still bottom, b) feeding 50 to 80 % by weight of the total methanol to the still bottom and the remaining methanol to a distillation tray which is 2 to 10 trays above the acetic acid feed tray, c ) feeding methanol and acetic acid into the distillation column at a …
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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 13, 1990 and granted August 13, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 2012.
- 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.