Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Inverkan av impregneringssteget på alkaliförbrukning och delignifieringsgrad vid sulfatkokning
KTH, School of Chemical Science and Engineering (CHE).
2015 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Effect of Impregnation Stage in Eucalyptus Kraft Cooking on Alkali Consumption and Degree of Delignification (English)
Abstract [en]

The technique to produce pulp has improved and become more complex throughout the years. The purpose of pulping is to liberate the wood fibers and it can be done in two ways, either by chemically or mechanically separating the fibers. This thesis will focus on the commonly used kraft pulping process for eucalyptus and especially on the impregnation stage and how it affects kappa number and alkali consumption. This is done by studying the alkali charge, impregnation time and temperature for the impregnation stage while maintaining constant cooking parameters.

This project has shown that the impregnation temperature affects the alkali consumption more than the impregnation time. A correlation between alkali consumption in the impregnation and the kraft cook was seen. When the consumption is high in the impregnation stage, a lower consumption was observed in the cooking stage.

Abstract [sv]

Tekniken för framställningen av trämassa har utvecklats och blivit mer komplex genom åren. Massaframsställningens syfte är att separera träfibrerna ifrån varandra vilket kan utföras på två sätt, antingen på kemisk eller mekanisk väg. Denna studie kommer att fokusera på den beprövade sulfatkokningen och då i synnerhet hur impregneringssteget påverkar kappa numret och alkali konsumtion. För att uppnå detta studeras basningen för alkalin, impregneringstid och temperatur under impregneringen samtidigt som de övriga parametrarna hålls konstanta.

Detta projekt har visat att impregneringstemperaturen påverkar alkali konsumtionen mer än tiden den impregneras. Andra studier som exempelvis Weiping Ban and Lucian A. Lucia 2003 och Joni Lehto & Raimo Alén 2013 har har också påvisat denna relation mellan alkali konsumtion och impregneringstemperaturen. Denna studie har även visat en alkali konsumtionstrend mellan impregneringen och sulfatkoket. När konsumtionen är hög under impregneringen så är den lägre i koket.

Place, publisher, year, edition, pages
2015. , 14 p.
Keyword [en]
Kraft cooking, Eucalyptus, Impregnation stage, Pulp technology, Alkali consumption
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-173356OAI: oai:DiVA.org:kth-173356DiVA: diva2:852776
Available from: 2015-09-10 Created: 2015-09-10 Last updated: 2015-09-10Bibliographically approved

Open Access in DiVA

fulltext(697 kB)160 downloads
File information
File name FULLTEXT01.pdfFile size 697 kBChecksum SHA-512
69fef5c7d82b301b242718678227856f265aef8e9f8b21ddcde00e0979be72f0d6a99f41a232f082b60eea107d6fa2ebaf9e89d7a86592e6753797db71cc58dd
Type fulltextMimetype application/pdf

By organisation
School of Chemical Science and Engineering (CHE)
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 160 downloads
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

urn-nbn

Altmetric score

urn-nbn
Total: 68 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf