Change search
ReferencesLink to record
Permanent link

Direct link
Process for continuously cooking chemical cellulose pulp: Kontinuerlig kokning med extra uppehållstid för avdragen vätska utanför kokaren
KTH, Superseded Departments, Fibre and Polymer Technology.ORCID iD: 0000-0002-2900-4713
2001 (Swedish)Patent (Other (popular science, discussion, etc.))
Abstract [en]

Process for continuously cooking chemical pulp in a digester system consisting of at least one vessel for impregnating and cooking comprising an inlet into which a mixture of chips and process liquid is fed. The chips are impregnated at a predetermined impregnation temperature Timp, and cooked at a predetermined cooking temperature Tcook, after which dissolved pulp is fed out at the outlet of the digester system. Process liquid which is continually extracted is retained outside the digester system during a dwell time, t, of at least 30 min, without any heating above 140 DEG , and thereafter returned to the digester system to a position which is substantially at the same level as the extraction, or downstream thereof, and thereby constitute part of the process liquid in the subsequent treatment zone. The process results in improved tear strength, beatability, bleachability and reduced colour reversion, and increased yield across the digester.

Place, publisher, year, edition, pages
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-49242OAI: diva2:459429
SE 520956 (2003-09-16)

US 7217338 B2 (2007-05-15); JP 4292082-B2 (2009-07-08); EP 1454009 B1 (2010-06-30); BR 0214632-B1 (2013-06-04)

Available from: 2011-11-25 Created: 2011-11-25 Last updated: 2013-08-07Bibliographically approved

Open Access in DiVA

No full text

Other links


Search in DiVA

By author/editor
Lindström, Mikael
By organisation
Fibre and Polymer Technology
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: 39 hits
ReferencesLink to record
Permanent link

Direct link