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Pretreatment of chips with white liquor prior to a treatment with black liquor: Förbehandling av flis med färsk vitlut före behandling med svartlut
KTH, Superseded Departments, Fibre and Polymer Technology.ORCID iD: 0000-0002-2900-4713
2001 (Swedish)Patent (Other (popular science, discussion, etc.))
Abstract [en]

The invention concerns a method for the manufacture of cooked cellulose pulp in which the starting material, preferably chips, undergoes a successive increase in temperature towards cooking temperature while the chips are first treated in a pre-treatment zone in which the main part, greater than 50%, of fresh white liquor necessary for the cooking stage is added, after which this alkali-rich treatment fluid is withdrawn and replaced to a major extent by black liquor. The alkali-rich treatment fluid that has been withdrawn after the pre-treatment to stage is then added to the cooking stage, which is why the addition of fresh white liquor to the cooking stage is reduced to an equivalent amount. Maximal yield-enhancing effect is obtained using polysulphide-rich white liquor during the pre-treatment at a temperature in the interval 60 +- 40 DEG C and retention time in the interval 2-60 minutes, preferably 2-10 minutes.

Place, publisher, year, edition, pages
2001.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-49236OAI: oai:DiVA.org:kth-49236DiVA: diva2:459423
Patent
SE 518538 (2002-10-22)
Note

US 7270725-B2 (2007-09-18); JP 4280636-B2 (2009-06-17); EP 1458927-B1 (2010-04-08); BR 0214922-B1 (2012-12-11)

Available from: 2011-11-25 Created: 2011-11-25 Last updated: 2013-08-09Bibliographically approved

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Lindström, Mikael

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