Process for separating trimethylolpropane and water soluble salts from a solution
CA 2280541 A1 · Owner: Mangnus, Eddy · Inventors: Jakob, Antje; Mangnus, Eddy; Van Der Velden, Paulus Martinus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for separating trimethylol-propane and a water-soluble salt from a solution thereof using electrodialysis. The solution is typically a crude product originating from an aldol addition of formaldehyde to butyraldehyde followed by a Cannizzaro reaction in the presence of an alkali metal hydroxide and contains trimethylolpropane, hydroxy functional byproducts and an alkali metal formate. The process does not use an organic solvent and may produce trimethylolpropane that is not colored and can be processed directly without further purification.
Read the whole patent
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 August 20, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 20, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2021.
- 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.