Change search
ReferencesLink to record
Permanent link

Direct link
Method and device for the continuous cooking of pulp
Show others and affiliations
1998 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

This invention relates to a new and improved way of continuously cooking fibre material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimise chemical consumption and heat-economy and at the same time achieve very good pulp properties. The fibre material is heated and impregnated by the aid of black liquor to a temperature less than 140 .degree.C and passed in con- current in an impregnation zone (A). The heated and impregnated fibre material is transferred to a con-current cooking zone (B) in the upper part of a digester (6). At least 60 % of the quantity of liquor (F) required for the cooking reaction is supplied in the up-stream end of the con- current cooking zone (B) in order to obtain a level of effective alkali exceeding 35 g/l.; The cooking temperature in the con-current cooking zone (B) is lower than 160 .degree.C. Spent liquor (E), with an amount of effective alkali of at least 13 g/l, is withdrawn from a strainer girdle (8). A substantial part of the spent liquor is supplied to the impregnation zone.

Place, publisher, year, edition, pages
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-49254OAI: diva2:459444
CA 2279283C (2008-08-26)

QC 20150128

Available from: 2011-11-25 Created: 2011-11-25 Last updated: 2015-01-28Bibliographically approved

Open Access in DiVA

No full text

Other links

Search in DiVA

By author/editor
Lindström, Mikael
Chemical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 30 hits
ReferencesLink to record
Permanent link

Direct link