Lignin removal method
CA 1319472 C · Owner: Acetocell Gmbh & Co. Kg · Inventors: Berg, Alex; Nimz, Horst H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Lignin contained in a cellulosic or lignocellulosic pulp product is removed by contacting the product with a gaseous medium containing ozone in the presence of a liquid agent which is a lower fatty acid, such a formic acetic or pro-, pionic acid, having only a low solvent capacity for lignin; as a consequence of this treatment, lignin which is present in the product will be converted into a lignin derivative that has an increased sealability in the fatty acid and can be removed quantitatively by extraction from the lignocellulosic material. Purified pulp can thus be obtained with increased processing efficiency and without most pollution problems of prior art processing methods because 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
- Granted June 29, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 29, 2010.
- 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.