Pretreatment and Cooking of Forest Residues
Journal article, 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.

Kraft cooking

Forest residues

Soda cooking

Pretreatment

Steam explosion

Author

Joanna Wojtasz-Mucha

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Reaction Engineering

Wallenberg Wood Science Center (WWSC)

Cecilia Mattsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Reaction Engineering

Merima Hasani

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Reaction Engineering

Wallenberg Wood Science Center (WWSC)

Hans Theliander

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Reaction Engineering

Wallenberg Wood Science Center (WWSC)

BioResources

1930-2126 (ISSN)

Vol. 14 4 9454-9471

Subject Categories

Polymer Chemistry

Paper, Pulp and Fiber Technology

Polymer Technologies

DOI

10.15376/biores.14.4.9454-9471

More information

Latest update

12/16/2019