Pretreatment and Cooking of Forest Residues
Artikel i vetenskaplig tidskrift, 2019

The aim of this work was to investigate the possibility of processing forest residues by chemical delignification preceded by mild steam explosion. The focus was on using soda pulping, due to its simplicity. Kraft cooking was used for comparison to improve the understanding of the separation of the complex yet promising resource. The raw material consisted of chipped branches, bark, and twigs of mixed hardwood and softwood. Analysis of the raw material proved to be challenging due to the presence of a substantial fraction of extractives. Analysis of the pulps showed that the forest residue delignification was faster than that of wood. The effects of steam explosion were evaluated with the help of composition analysis, gel permeation chromatography (GPC) for the molecular weight of lignin, and NMR for the changes in its structure. The impact of steam explosion was found to be limited, possibly due to the relatively small size of the material.

Steam explosion

Kraft cooking


Forest residues

Soda cooking


Joanna Wojtasz-Mucha

Chalmers, Kemi och kemiteknik, Kemiteknik

Wallenberg Wood Science Center (WWSC)

Cecilia Mattsson

Chalmers, Kemi och kemiteknik, Kemiteknik

Merima Hasani

Chalmers, Kemi och kemiteknik, Kemiteknik

Wallenberg Wood Science Center (WWSC)

Hans Theliander

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi och kemiteknik, Kemiteknik


1930-2126 (ISSN)

Vol. 14 4 9454-9471



Pappers-, massa- och fiberteknik




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