SwePub
Sök i SwePub databas

  Extended search

Träfflista för sökning "WFRF:(Brännvall Karin) srt2:(2020-2022)"

Search: WFRF:(Brännvall Karin) > (2020-2022)

  • Result 1-2 of 2
Sort/group result
   
EnumerationReferenceCoverFind
1.
  • Brännvall, Elisabet, 1961-, et al. (author)
  • Process modifications to obtain a prehydrolysis kraft dissolving pulp with low limiting pulp viscosity
  • 2020
  • In: Nordic Pulp & Paper Research Journal. - : Walter de Gruyter. - 0283-2631 .- 2000-0669. ; 35:3, s. 332-341
  • Journal article (peer-reviewed)abstract
    • Cellulose can be directly dissolved in cold alkali without derivatization. However, this requires low cellulose molecular weight, i. e. low pulp viscosity, preferably below 300 mL g−1. This can be achieved by for example acid or enzymatic hydrolysis of the dissolving pulp. However, it would be beneficial to manufacture pulp with sufficiently low viscosity without an additional treatment stage prior to dissolution. Unit processes in pulping can be operated in such a way as to reduce the molecular weight of cellulose. The approach of the study was to modify the conditions in unit pulping processes in order to obtain a low pulp viscosity of fully bleached prehydrolysis kraft pulp. A high charge of alkali in the oxygen delignification reduced the cellulose molecular weight significantly. Increased temperature, 120 °C compared to 98 °C, had also a significant effect on viscosity. By performing peroxide bleaching at acidic pH, the viscosity could be sufficiently reduced even when oxygen delignification was performed at lower temperature. However, for high brightness, a chlorine dioxide stage is needed.
  •  
2.
  •  
Skapa referenser, mejla, bekava och länka
  • Result 1-2 of 2
Type of publication
other publication (1)
journal article (1)
Type of content
other academic/artistic (1)
peer-reviewed (1)
Author/Editor
Brännvall, Elisabet, ... (1)
Örmon, Karin (1)
Walter, Karin (1)
Brännvall, Mari, 198 ... (1)
Lövestad, Solveig (1)
University
University of Gothenburg (1)
RISE (1)
Language
Swedish (1)
English (1)
Research subject (UKÄ/SCB)
Medical and Health Sciences (1)

Year

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Close

Copy and save the link in order to return to this view