Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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
About structural changes of lignin during kraft cooking and the kinetics of delignification
KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
Show others and affiliations
2017 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 71, no 7-8, p. 545-553Article in journal (Refereed) Published
Abstract [en]

Wood meal was submitted to kraft cooking in a small-scale flow-through reactor and the structural changes of lignin have been investigated. The rate determining steps in kraft cooking were in focus. Based on two-dimensional nuclear magnetic resonance (2D-NMR) measurements on lignin fractions extracted at different cooking times from the black liquor, it was observed that the main lignin reactions occur within 10-20 min and thus the kinetics of the chemical reaction cannot be the rate-determining step. On the other hand, the molecular weight (MW) of lignin is shifted towards larger fragments in the course of cooking time but the MW decreases with increasing ionic strength. Obviously, the kinetics of the delignification are strongly dependent on solubility and/or mass transport at the cell wall level. At chip size level, the mass transport of cooking chemicals into the wood chip may influence the overall kinetics in the initial part of the cooking. At longer cooking times the concentration of chemicals becomes sufficiently high in the wood chips, and the delignification is progressively governed by solubility and/or mass transport of lignin molecules occurring at the cell wall level.

Place, publisher, year, edition, pages
WALTER DE GRUYTER GMBH , 2017. Vol. 71, no 7-8, p. 545-553
Keywords [en]
ATR-IR, 2D HSQC NMR, delignification, dissolved kraft lignin, flow-through reactor, kinetics, kraft pulping, softwood, structural characterization of lignin, wood meal
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-211386DOI: 10.1515/hf-2016-0190ISI: 000404721500002Scopus ID: 2-s2.0-85021778167OAI: oai:DiVA.org:kth-211386DiVA, id: diva2:1130363
Conference
14th European Workshop on Lignocellulosics and Pulp (EWLP), JUN, 2016, Autrans, FRANCE
Note

QC 20170809

Available from: 2017-08-09 Created: 2017-08-09 Last updated: 2017-08-21Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Dang, Binh
By organisation
Wallenberg Wood Science Center
In the same journal
Holzforschung
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 111 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • 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