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Fractional profiling of kraft lignin structure: Unravelling insights on lignin reaction mechanisms
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0003-4266-0720
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. 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. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-8614-6291
2019 (English)In: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485Article in journal (Refereed) Published
Abstract [en]

The kraft process is the main process used for the production of chemical pulps. In this process, an efficient delignification is achieved, yielding bleachable grade pulps. In recent years, there has been interest in valorization of the dissolved lignins, prompted by the development of technically feasible processes to retrieve it from the black liquor. However, the structural-, functional-, and size-related heterogeneities of lignin present both analytical challenges and challenges in developing new applications. Hence, refining of the crude product is essential. Herein, advanced NMR characterization (13C NMR, APT/DEPT NMR, 31P NMR, HSQC, HMBC, HSQC-TOCSY) was applied to profile the detailed molecular structures of refined kraft lignins and unravel mechanistic insights on important lignin reactions during kraft pulping. From this structural analysis of the lignins, a model oligomer was synthesized and analyzed to provide support to the effect that a retro-aldol reaction in combination with radical recombination reactions play a significant role in the formation of the reconstituted fraction of kraft lignin. In this regard, a new type of linkage accounting for approximately 10% of the interunits in kraft lignin is reported.

Place, publisher, year, edition, pages
2019.
Keywords [en]
Kraft lignin Radical coupling Retro-aldolization 2D NMR 13C NMR 31P NMR
National Category
Wood Science
Research subject
Fibre and Polymer Science
Identifiers
URN: urn:nbn:se:kth:diva-266463DOI: 10.1021/acssuschemeng.9b06027OAI: oai:DiVA.org:kth-266463DiVA, id: diva2:1385175
Note

QC 20200114

Available from: 2020-01-13 Created: 2020-01-13 Last updated: 2020-01-14Bibliographically approved

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Giummarella, Nicola

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Giummarella, NicolaLindén, Pär A.Lawoko, Martin
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