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Wood Research and Technology


Cellulose – Hemicelluloses – Lignin – Wood Extractives

Editor-in-Chief: Salmén, Lennart

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Influence of long-term heat treatment of kraft black liquor on lignin precipitation and material properties

Thomas Pichler
  • Corresponding author
  • Institute of Chemical Engineering and Environmental Technology, Graz University of Technology, Inffeldgasse 25c, 8010 Graz, Austria
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/ Silvia Maitz
  • Institute of Chemical Engineering and Environmental Technology, Graz University of Technology, Inffeldgasse 25c, 8010 Graz, Austria
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/ Marlene Kienberger
  • Institute of Chemical Engineering and Environmental Technology, Graz University of Technology, Inffeldgasse 25c, 8010 Graz, Austria
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Published Online: 2019-08-31 | DOI: https://doi.org/10.1515/hf-2019-0143


In the present study, the influence of long-term heat treatment of black liquor with focus on a subsequent lignin precipitation process was investigated. The well-known CO2 approach to precipitate a certain amount of lignin from heat-treated black liquor was studied within defined thermal conditions. Several important characteristics of lignin such as molar mass and functional groups were analysed. Viscosity and buffer capacity of black liquor were also studied. Results showed a reduction in lignin yield as a result of a decrease in molar mass and lignin demethylation after the heat treatment. The acid consumption during precipitation was found to be higher after the heat treatment.

Keywords: black liquor; heat treatment; lignin demethylation; lignin precipitation


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About the article

Received: 2019-05-16

Accepted: 2019-08-06

Published Online: 2019-08-31

Funding Source: Austrian Research Promotion

Award identifier / Grant number: 861476

We thank the Austrian Research Promotion Agency for the financial support in the project Flippr2 (Funder Id: http://dx.doi.org/10.13039/501100004955, grant no. 861476) and the project consortium for the collaboration in this study.

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

Employment or leadership: None declared.

Honorarium: None declared.

Citation Information: Holzforschung, 20190143, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf-2019-0143.

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