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Precipitation of lignin from softwood black liquor: An investigation of the equilibrium and molecular properties of lignin

Weizhen Zhu (Institutionen för kemi och kemiteknik, Skogsindustriell kemiteknik) ; Hans Theliander (Institutionen för kemi och kemiteknik, Skogsindustriell kemiteknik)
BioResources (1930-2126). Vol. 10 (2015), 1, p. 1696-1714.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Softwood black liquor; Carbohydrate analysis; 1H and 13C NMR spectra of kraft lignin; Lignin precipitation; LignoBoost process; Molecular weight of lignin



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Denna post skapades 2015-01-29. Senast ändrad 2015-07-20.
CPL Pubid: 211736

 

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