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Precipitation of Lignin from Softwood Black Liquor: An Investigation of the Equilibrium and Molecular Properties of Lignin
KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center. Chalmers, Sweden.
2015 (English)In: BioResources, ISSN 1930-2126, Vol. 10, no 1, 1696-1714 p.Article, review/survey (Refereed) Published
Abstract [en]

Extracting lignin from black liquor is an attractive option in modern pulp mills as a unit process for a combined biorefinery. The lignin obtained can be utilized as solid fuel or other high-value added products. The precipitation equilibrium of kraft lignin from softwood black liquor was studied in this work. It was found that with decreasing pH and temperature, or increasing ion strength, the solid yield increases. Moreover, precipitated softwood kraft lignin has a higher molecular weight and contains lower amounts of carbohydrates and phenolic groups than lignin precipitated from mixed hardwood/softwood black liquor. The content of methoxyl groups in softwood kraft lignin was found to decrease with increasing precipitation yield. An empirical model for estimating the precipitation yield of lignin was proposed and evaluated.

Place, publisher, year, edition, pages
2015. Vol. 10, no 1, 1696-1714 p.
Keyword [en]
Softwood black liquor, Carbohydrate analysis, H-1 and C-13 NMR spectra of kraft lignin, Lignin precipitation, LignoBoost process, Molecular weight of lignin
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-166358ISI: 000351941000136ScopusID: 2-s2.0-84923651930OAI: diva2:811109

QC 20150511

Available from: 2015-05-11 Created: 2015-05-07 Last updated: 2015-05-11Bibliographically approved

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Theliander, Hans
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