Desulfurization of kraft lignin

Kraft lignin is a product of the sulfate pulping process. It usually contains 2–3% total sulfur. Sulfur content acts as deterrent to lignin use in some areas. Sulfur-free lignins are more versatile and can be heat-treated without the release of foul-smelling sulfur compounds. These lignins are used...

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Bibliographic Details
Published in:Wood science and technology 2018-07, Vol.52 (4), p.1165-1174
Main Authors: Evdokimov, Andrey N., Kurzin, Alexander V., Fedorova, Olesya V., Lukanin, Pavel V., Kazakov, Vladimir G., Trifonova, Alena D.
Format: Article
Language:English
Subjects:
Acetic anhydride
Anhydrides
Benzene
Biomedical and Life Sciences
Catalysis
Ceramics
Composites
Depolymerization
Desulfurization
Desulfurizing
Dimethylformamide
Glass
Heat treatment
Life Sciences
Lignin
Machines
Manufacturing
Natural Materials
Original
Oxidation
Perchloric acid
Processes
Pulping
Sodium
Sodium sulfite
Sulfates
Sulfite
Sulfur
Sulfur compounds
Sulfur content
Wood Science & Technology
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Summary:Kraft lignin is a product of the sulfate pulping process. It usually contains 2–3% total sulfur. Sulfur content acts as deterrent to lignin use in some areas. Sulfur-free lignins are more versatile and can be heat-treated without the release of foul-smelling sulfur compounds. These lignins are used to produce various low- and high-molecular products, as well as fuel. The existing soft desulfurization methods of kraft lignin allow reducing the total sulfur content, for example, fivefold by a method combining extraction of elemental sulfur, oxidation and reduction in sulfur compounds. Deeper desulfurization has earlier been achieved by catalytic hydrogenation, which is accompanied by depolymerization of lignin. In this paper, it was established that sequential treatment of sulfate lignin with benzene, silver in dimethylformamide, aqueous sodium sulfite solution and perchloric acid + acetic anhydride mixture can reduce the total sulfur content a hundredfold.
ISSN:0043-7719
1432-5225
DOI:10.1007/s00226-018-1014-1