Process for obtaining lignin from alkaline solutions thereof
CA 1269345 C · Owner: Wabner, Dietrich · Inventors: Edel, Eugen; Wabner, Dietrich; Grambow, Clemens
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 method and apparatus for recovering lignin and alkali from an alkaline lignin solution. One or more electrolytic cells are used to anodically acidify the alkaline lignin solution by electrolysis, precipitate lignin from the solution as a foam in the anode compartment and simultaneously to cathodically regenerate and recover alkali from the solution. The invention is essentially advantageous for the preparation of pure lignin and alkali from the waste liquor of a cellulose process.
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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 May 22, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 22, 2007.
- 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.