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Micro/nano-structural evolution in spruce wood during soda pulping

Wagih, Ahmed ; Hasani, Merima ; Hall, Stephen A. LU and Theliander, Hans (2021) In Holzforschung 75(8). p.754-764
Abstract

Alkaline delignification of wood tissue is the core of the global pulping technology and the most prominent large-scale separation of the main wood components. This work aims at improved understanding of the interplay between the topochemistry of alkaline pulping and the associated morphological changes. Morphology and chemical structure of partially soda-delignified wood chips were studied combining X-ray tomography (XRT), X-ray diffraction analysis and compositional characterization (lignin and carbohydrate content). The XRT studies of wet samples (providing 3D structural information without interfering drying effects), allowed observation of the cell wall separation as an increasing amount of lignin was removed with the increasing... (More)

Alkaline delignification of wood tissue is the core of the global pulping technology and the most prominent large-scale separation of the main wood components. This work aims at improved understanding of the interplay between the topochemistry of alkaline pulping and the associated morphological changes. Morphology and chemical structure of partially soda-delignified wood chips were studied combining X-ray tomography (XRT), X-ray diffraction analysis and compositional characterization (lignin and carbohydrate content). The XRT studies of wet samples (providing 3D structural information without interfering drying effects), allowed observation of the cell wall separation as an increasing amount of lignin was removed with the increasing pulping time. Comparison between the microstructure of the surface and the central parts of the treated chips showed a more delignified microstructure at the surface, which highlights the dependence of the delignification process on the mass transport (hydroxide ions and lignin fragments) through the wood tissue. The crystallite size of cellulose increased in the <200> crystal planes during the early stage of pulping while there was little effect on the <110> plane.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
delignification, microstructure, soda pulping, spruce wood, X-ray tomography
in
Holzforschung
volume
75
issue
8
pages
754 - 764
publisher
De Gruyter
external identifiers
  • scopus:85099340985
ISSN
0018-3830
DOI
10.1515/hf-2020-0113
language
English
LU publication?
yes
id
ff085419-1b77-43cf-b58d-8a3478736101
date added to LUP
2021-01-25 12:54:24
date last changed
2024-03-22 09:46:48
@article{ff085419-1b77-43cf-b58d-8a3478736101,
  abstract     = {{<p>Alkaline delignification of wood tissue is the core of the global pulping technology and the most prominent large-scale separation of the main wood components. This work aims at improved understanding of the interplay between the topochemistry of alkaline pulping and the associated morphological changes. Morphology and chemical structure of partially soda-delignified wood chips were studied combining X-ray tomography (XRT), X-ray diffraction analysis and compositional characterization (lignin and carbohydrate content). The XRT studies of wet samples (providing 3D structural information without interfering drying effects), allowed observation of the cell wall separation as an increasing amount of lignin was removed with the increasing pulping time. Comparison between the microstructure of the surface and the central parts of the treated chips showed a more delignified microstructure at the surface, which highlights the dependence of the delignification process on the mass transport (hydroxide ions and lignin fragments) through the wood tissue. The crystallite size of cellulose increased in the &lt;200&gt; crystal planes during the early stage of pulping while there was little effect on the &lt;110&gt; plane. </p>}},
  author       = {{Wagih, Ahmed and Hasani, Merima and Hall, Stephen A. and Theliander, Hans}},
  issn         = {{0018-3830}},
  keywords     = {{delignification; microstructure; soda pulping; spruce wood; X-ray tomography}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{8}},
  pages        = {{754--764}},
  publisher    = {{De Gruyter}},
  series       = {{Holzforschung}},
  title        = {{Micro/nano-structural evolution in spruce wood during soda pulping}},
  url          = {{http://dx.doi.org/10.1515/hf-2020-0113}},
  doi          = {{10.1515/hf-2020-0113}},
  volume       = {{75}},
  year         = {{2021}},
}