Fractionation and concentration of kraft black liquor lignin with ultrafiltration

Wallberg, Ola; Jönsson, Ann‐Sofi; Wimmerstedt, Roland

doi:10.1016/s0011-9164(03)80019-x

Cited by 121 publications

(67 citation statements)

References 24 publications

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“…This can be attributed to high amounts of sodium and sulfur used in the kraft process (Wallberg et al 2003). The ash content of black liquor has been reported to be as much as 30% (Mansouri and Salvadó 2006).…”

Section: Ash Analysismentioning

confidence: 99%

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Thermal Characteristics of Lignin Residue from Industrial Processes

et al. 2013

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aMany pulp mills and biorefineries today are focusing on the utilization of their residual lignin for economic return. Although lignin can be burned to produce energy, it also has the potential for the production of valueadded products. Technical lignins have modified structure and contain different impurities, which depend on the original material, as well as the extraction process. Among the various techniques for lignin extraction, kraft and steam explosion processes are the most commonly used in the pulping and biorefinery industries, respectively. The objective of this work was to compare the thermal behavior of industrial lignins produced from kraft pulping and steam explosion, with that of their chemically extracted, purified forms. It was found that the purified lignins have very similar thermal properties to one another, while impurities in the industrial lignins significantly alter their thermal behavior, and hence their potential in value-added applications. The percentage of degradation from 200 to 600 °C and glass transition temperature of original steam-exploded lignin was 68.5% and 149.16 °C, while of original kraft lignin was 26.0% and 109.82 °C. These values were altered after purification to 61.0% and 158.99 °C for steam-exploded lignin; and to 40.0% and 129.82 °C for kraft lignin, respectively.

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Section: Ash Analysismentioning

confidence: 99%

“…%), and sulfur (3 to 5 wt. %) (Wallberg et al 2003). In the steam explosion process, biomass is fractionated for producing cellulosic ethanol (Doherty et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Thermal Characteristics of Lignin Residue from Industrial Processes

et al. 2013

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“…Such a lignin has a low ash and high dry content. As an alternative option, lignin in BL can be fractionated by membrane filtration prior to precipitation (Wallberg et al 2003;Holmqvist et al 2005;Brodin et al 2009). In this case, the lignin has a more narrow molecular weight (MWt) distribution (MWtD).…”

Section: Introductionmentioning

confidence: 99%

The molecular properties and carbohydrate content of lignins precipitated from black liquor

Zhu

Westman²,

Theliander³

2014

Holzforschung

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Precipitation and utilization of lignin from black liquor (BL) offers many promising advantages to modern kraft pulp mills. A novel process, known as "LignoBoost", has recently been introduced as a process for separating lignin from BL; it results in lignins with a low ash and high dry solid content. There is a lack of knowledge regarding the influences of process parameters on the behavior of lignin in the precipitation step. In this study, the yield of precipitated lignin and its average molecular weight (MWt) and carbohydrate content were the focus. Nuclear magnetic resonance (NMR) analysis showed that the lignin yield increased at lower pH and temperatures or when the ion strength of BL was elevated. High yield lignins contained more low MWt components and such lignins have more phenolic OH and methoxy groups. Xylan content of the lignins decreased with decreasing pH and increasing temperature, but glucomannan content was virtually unaffected by the conditions of precipitation.

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“…There have been many recent studies [5][6][7][8][9][10][11][12][13][14][15][16] conducted on membrane separation processes to recover chemicals and water in the PPI, much like what is desired in a lignocellulosicbiorefinery. In addition, early PPI application research and commercial installations stretch back to the late 1960's and are quite comprehensively enumerated by Wallberg, Jönsson and coworkers, in ref.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, early PPI application research and commercial installations stretch back to the late 1960's and are quite comprehensively enumerated by Wallberg, Jönsson and coworkers, in ref. [10]. More recently, new membrane materials, both polymeric and inorganic, have become available that have a broader range of pH, solvent, and temperature stability and have been evaluated at higher temperatures for hemicellulose and lignin [12][13][14] recovery from alkaline liquors.…”

Section: Introductionmentioning

confidence: 99%

DOEGO85004_1: Final Non-proprietary Technical Report, Generating Process and Economic Data for Preliminary Design of PureVision Biorefineries DOEGO85004_2: One Original Final Proprietary Technical Report to be mailed to DOE Golden.

Kadam¹,

Lehrburger²

2008

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Fractionation and concentration of kraft black liquor lignin with ultrafiltration

Cited by 121 publications

References 24 publications

Thermal Characteristics of Lignin Residue from Industrial Processes

Thermal Characteristics of Lignin Residue from Industrial Processes

The molecular properties and carbohydrate content of lignins precipitated from black liquor

DOEGO85004_1: Final Non-proprietary Technical Report, Generating Process and Economic Data for Preliminary Design of PureVision Biorefineries DOEGO85004_2: One Original Final Proprietary Technical Report to be mailed to DOE Golden.

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