Accueil Sciences et Innovations Sciences The LignoForce system™: A New Process for the Production of High-quality Lignin from Black Liquor

The LignoForce system™: A New Process for the Production of High-quality Lignin from Black Liquor

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Article technique paru dans J-FOR* Vol.2, No4, 2012 (Disponible en anglais seulement)

RÉSUMÉ

Lignin can be precipitated and recovered from Kraft black liquor (BL) through the addition of an acidifying agent such as carbon dioxide, followed by filtration and washing. During this process, many researchers previously reported a high filtration resistance which affects lignin purity, cost, and productivity. To improve lignin filterability, FPInnovations developed the LignoForce System™, a patent-pending process in which the BL is oxidized under controlled conditions before the acidification step of conventional lignin recovery processes.

Based on the data obtained, BL oxidation improves the filterability of the acid-precipitated lignin by providing suitable conditions with respect to pH (leads to a lower pH) and temperature (leads to a higher temperature) for lignin colloid agglomeration, leading to the formation of particles of a size and size distribution that are easy to filter and wash. In addition, it minimizes or eliminates total reduced sulphur (TRS) compounds, thereby leading to reduced TRS emissions during all steps associated with lignin precipitation, filtration, and washing.

Furthermore, because the oxidation of TRS compounds and sugars consumes residual effective alkali (sodium hydroxide) in BL, the carbon dioxide and sulphuric acid requirements of the process are significantly reduced. An additional feature of the LignoForce process is the use of a filter press instead of a belt filter for lignin cake filtration and washing. No major difference in the chemical composition, molecular weight distribution, or main functional groups was found in the lignins produced using the LignoForce process compared with lignins produced by conventional methods.

Based on the results obtained in laboratory studies, a lignin demonstration plant was designed and built at the Resolute – Thunder Bay mill for the production of 12.5 kg/h of high-quality lignin.

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AUTEURS :

ART1-auteur2 ART1-auteur3 ART1-auteur4
 LAMFEDDAL KOUISNI
FPInnovations
Pulp, Paper &
Bioproducts Division,
Pointe-Claire, QC,
Canada
 
 PETER HOLT-HINDLE
FPInnovations
Pulp, Paper &
Bioproducts Division,
Thunder Bay, ON,
Canada
KIRSTEN MAKI
FPInnovations
Pulp, Paper &
Bioproducts Division,
Thunder Bay, ON,
Canada 
MICHAEL PALEOLOGOU
FPInnovations
Pulp, Paper &
Bioproducts Division,
Pointe-Claire, QC,
Canada

* J-FOR - The Journal of Science & Technology for Forest Products and Processes, est une publication phare de PAPTAC, comprenant des articles évalués de haute qualité, traitant de technologie et de science relativement à des domaines traditionnels et émergents propres à l'industrie forestière.

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