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Structural basis for lignin recalcitrance during sulfite pulping for production of dissolving pulp from pine heartwood
KTH; MoRe Research Örnsköldsvik AB.
MoRe Research Örnsköldsvik AB.
MoRe Research Örnsköldsvik AB; Domsjö Fabriker.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013). KTH.ORCID iD: 0000-0001-8817-2031
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2022 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 177, article id 114391Article in journal (Refereed) Published
Abstract [en]

Dissolving pulps are technically produced by prehydrolysis kraft, one-stage or two-stage acid sulfite pulping. Like other pulping methods, the delignification process is incomplete and bleaching is required for complete lignin removal. Here, we explored the molecular aspects of lignin recalcitrance during the pulping, in order to gain insights that could inform future pulping efforts. For this purpose, we adopted a protocol for the controlled fractionation of pulp into soluble fractions that could be analyzed by spectroscopic methods including size exclusion chromatography (SEC) and 2D NMR methods. In addition, lignosulfonates (i.e. technical lignin) was analysed as a reference to gain insights on the structural basis for dissolution. Overall, the results identify a sequence of reactions responsible for the dissolution of lignin. In the first stage, the sulfonation of lignin begins and occurs at the alpha-carbon of beta-O-4 and beta-5 sub-structures. In the second stage the cleavage of lignin carbohydrate bonds (LCC) of benzyl ether, gamma ester and phenylglycosides types, all of which were detected in the residual lignin of the earlier phases, occurs and enhances lignin dissolution. Finally, condensation reactions of benzylic cations with activated positions on aromatic ring were detected in lignosulfonates. This suggest that a competing reaction mode to the sulfonation at C-alpha position in lignin was occurring at prolonged pulping conditions, here considered to be unproductive.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 177, article id 114391
Keywords [en]
Pine heartwood, Lignin carbohydrate complexes, Lignin sulfonation, Lignin condensation, Sulfite pulping, Dissolving pulp
National Category
Materials Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-88048DOI: 10.1016/j.indcrop.2021.114391ISI: 000736963700005Scopus ID: 2-s2.0-85121623318OAI: oai:DiVA.org:kau-88048DiVA, id: diva2:1627530
Available from: 2022-01-13 Created: 2022-01-13 Last updated: 2022-04-07Bibliographically approved

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Henriksson, Gunnar

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