Process for the removal of aldehydes and acetals from industrially prepared acetic acid
CA 2128548 A1 · Owner: Seidel, Andreas · Inventors: Hauser, Alfred; Prinz, Peter; Seidel, Andreas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the removal of aldehydes and acetals from industrially prepared acetic acid Abstract of the disclosure, A process is specified for the removal of aldehydes and acetals from industrially prepared acetic acid which, comprises reacting the contaminated acetic acid in the presence of a Br?natedt acid and 0.05 to 1% by weight of water and, if required, of 3 to 10 equivalents calcu-, lated on aldehyde and acetal, of a high-boiling polyhydric alcohol having the general structural member in which n is an integer from 0 to 3 and m is an integer greater than 3, at temperature of 50 to 118°C for a period of 1 to 5 hours, and then isolating the pure acetic acid from the reaction product by …
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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 July 21, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 21, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 21, 2016.
- 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
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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.