About structural changes of lignin during kraft cooking and the kinetics of delignification KKA PO, 1990, PAPERI JA PUU-PAPER AND TIMBER, V72, P773
Artikel i vetenskaplig tidskrift, 2017

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.



C-13 NMR



Lithium Chloride/N

flow-through reactor

Size-Exclusion Chromatography


dissolved kraft lignin




Cecilia Mattsson

Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Merima Hasani

Wallenberg Wood Science Center (WWSC)

Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Binh Dang

Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Maxim Mayzel

Göteborgs universitet

Hans Theliander

Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Wallenberg Wood Science Center (WWSC)


0018-3830 (ISSN) 1437-434X (eISSN)

Vol. 71 545-553


Pappers-, massa- och fiberteknik