Process for cooking and bleaching pulp
CA 1332023 C · Owner: Kvaerner Pulping Oy · Inventors: Rimpi, Pertti
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 cooking and bleaching pulp in a closed system, in which the spent liquors from the cooking and the bleaching are recovered and their chemicals are regenerated and recycled as cooking and bleaching chemicals. In the process according to the invention the melt, which has been obtained by burning the spent liquor deriving from the cooking and the bleaching of the pulp material and the secondary product to be obtained in the preparation of chlorine dioxide, are dissolved in order to form green liquor, which contains plenty of sulphide and chloride. This green liquor is divided into two flows of which one, is causticized in order to form white liquor which …
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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 September 20, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 20, 2011.
- 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.