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Microwave processing of lignin in green solvents: A high-yield process to narrow-dispersity oligomers
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymer Technology.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-4342-7739
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-6982-1865
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymer Technology.ORCID iD: 0000-0001-7433-0350
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2020 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 145, article id 112152Article in journal (Refereed) Published
Abstract [en]

Functional narrow-dispersity kraft lignin oligomers in high-yields were produced by a combined microwave-assisted extraction/degradation process. The process took place under mild non-catalytic conditions, in green solvents, and moderate temperatures (80 -160 degrees C). High yields, i.e., 63 % and 64 %, of lignin oligomers with narrow dispersity were obtained after only 40 min microwave processing in methanol and ethanol, respectively. The ethanol-soluble yield increased substantially after microwave processing as compared to samples extracted by liquid-solid solvent-extraction. This increase was mainly ascribed to the cleavage of beta-O-4 linkages, as indicated by semiquantitative 2D-HSQC NMR. Under the corresponding conditions in methanol, the yields after microwave processing were similar to those obtained by liquid-solid solvent-extraction. The difference is likely ascribed to the different reactivities of the solvents as O-alkylation agents. Furthermore, the obtained lignin fractions had high functionality, as shown by hydroxyl-group quantification through P-31-NMR. This, along with the narrow dispersity and rich aromatic structure, makes these oligomers interesting precursors for future thermoset syntheses.

Place, publisher, year, edition, pages
ELSEVIER , 2020. Vol. 145, article id 112152
Keywords [en]
Lignin, Microwave processing, Fractionation, Degradation, Extraction
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-271727DOI: 10.1016/j.indcrop.2020.112152ISI: 000518865400074Scopus ID: 2-s2.0-85078316830OAI: oai:DiVA.org:kth-271727DiVA, id: diva2:1424162
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QC 20200416

Available from: 2020-04-16 Created: 2020-04-16 Last updated: 2020-04-16Bibliographically approved

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Cederholm, LinneaXu, YunshengTagami, AyumuSevastyanova, OlenaOdelius, KarinHakkarainen, Minna

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