Investigation and Characterization of Lignin Precipitation in the LignoBoost Process
Artikel i vetenskaplig tidskrift, 2013

Lignin of high purity can be separated from black liquor using the LignoBoost process, of which the overall efficiency is largely dependent on the precipitation yield of lignin, which depends on the properties of black liquor and process conditions. In this paper, the influences of process conditions on the precipitation yield of lignin from mixed hardwood/softwood black liquor were investigated. The Klason and standardUV method were used to determine lignin concentration. The chemical and structural properties of lignin were also analyzed. The results showed that the precipitation yield of lignin increased along with a decrease in pH and temperature, or with an increase in the ion strength of black liquor, and the yield was lower when mixed softwood/hardwood black liquor was used. It also showed that at a higher precipitation yield the precipitated lignin had a lower average molecular weight but had higher methoxyl and phenolic hydroxyl content


Weizhen Zhu

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Gunnar Westman

Chalmers, Kemi- och bioteknik, Organisk kemi

Wallenberg Wood Science Center (WWSC)

Hans Theliander

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi- och bioteknik, Skogsindustriell kemiteknik

Journal of Wood Chemistry and Technology

0277-3813 (ISSN) 1532-2319 (eISSN)

Vol. 34 2 77-97


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