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COST Action FP1105: effect of raw materials and pulping conditions on the characteristics of dissolved kraft lignins
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.ORCID iD: 0000-0002-2041-5786
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
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2016 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 70, no 12, p. 1105-1114Article in journal (Refereed) Published
Abstract [en]

The composition, molecular weight (MW), and chemical structure of technical lignins as byproducts of pulping influence their application in terms of physical and chemical properties, reactivity, and performance. It is important to know how the analytical data of technical lignins are influenced by the wood species and the parameters of pulping. The present study focuses on kraft pulping and how the wood species (eucalyptus, pine, and spruce) and variable cooking times influence the characteristics of dissolved lignins. The black liquor (BL) was recovered after three different cooking times and the precipitated lignin was characterized by total acid hydrolysis including the determination of the acid insoluble part (Klason lignin, KL) and the sugars in the hydrolysate, elemental analysis, 31P NMR spectroscopy, analytical pyrolysis (Py-GC/MS), gel permeation chromatography (GPC), thermogravimetry (TG), and differential scanning calorimetry (DSC). The results indicate that the phenolic OH content, MW and glass transition temperature increased with longer cooking times for the softwood (SW) lignins. These lignins had also a higher MW (M-w 5500-8000 g mol(-1)), than the eucalyptus lignin (M-w 2200-2400 g mol(-1)). Eucalyptus lignin had higher sulfur content compared to SW.

Place, publisher, year, edition, pages
Walter de Gruyter, 2016. Vol. 70, no 12, p. 1105-1114
Keyword [en]
DSC, eucalyptus, GPC, kraft cooking, lignin, lignin precipitation, pine, P-31-NMR, Py-GC/MS, spruce, TGA
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-199495DOI: 10.1515/hf-2016-0057ISI: 000389466800002Scopus ID: 2-s2.0-84998554796OAI: oai:DiVA.org:kth-199495DiVA, id: diva2:1066509
Note

QC 20170118

Available from: 2017-01-18 Created: 2017-01-09 Last updated: 2017-11-29Bibliographically approved

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Svärd, AntoniaSevastyanova, OlenaBrännvall, Elisabet

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Polymer TechnologyWood Chemistry and Pulp TechnologyWallenberg Wood Science CenterFibre and Polymer Technology
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