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Solvent fractionation of softwood and hardwood kraft lignins for more efficient uses: Compositional, structural, thermal, antioxidant and adsorption properties
KTH Royal Institute of Technology, Department of Fibre and Polymer Technology, Stockholm, Sweden / Nippon Paper Industries Co., Ltd., Research Laboratory, Oji, Kita-ku, Tokyo, Japan.
KTH Royal Institute of Technology, WWSC-Wallenberg Wood Science Centre, Stockholm, Sweden / University of Bologna, Department of Civil, Chemical, Environmental, and Materials Engineering, Bologna, Italy.
Latvian State Institute of Wood Chemistry, Riga, Latvia.
KTH Royal Institute of Technology, Department of Fibre and Polymer Technology, Stockholm, Sweden.
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2019 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 129, p. 123-134Article in journal (Refereed) Published
Abstract [en]

This work summarizes the impact of solvent fractionation on the chemical structure, antioxidant activity, heating values, and thermal and adsorption properties of industrial hardwood and softwood kraft lignins. The aim of the research was to develop a simple approach for obtaining lignin fractions with tailored properties for applications in certain materials. Four common industrial solvents, namely, ethyl acetate, ethanol, methanol and acetone, in various combinations, were found to be efficient for separating spruce and eucalyptus kraft lignins into fractions with low polydispersities. The ethanol fraction of spruce and the ethyl acetate fraction of eucalyptus afforded the highest yields. Gel-permeation chromatography analysis was used to evaluate the efficiency of the chosen solvent combination for lignin fractionation. The composition and structure of the lignin material was characterized by elemental analysis, analytical pyrolysis (Py-GC/MS/FID) and 31P NMR spectroscopy. The thermal properties of the lignin samples were studied using thermogravimetric analysis. Proximate analysis data (ash, volatile components, organic matter and fixed carbon) was obtained through the direct measurement of weight changes in each experimental curve, and the high heating values (in MJ/kg) were calculated according to equations suggested in the literature. The adsorption properties of fractionated kraft lignins were studied using methylene blue dye. The correlations observed between molecular weight, composition and functionality and the thermal, radical scavenging and adsorption properties of the lignin fractions provides useful information for selecting the appropriate solvent combinations for specific applications of lignin raw materials (including their use as antioxidants, biofuels or sorbents in water treatment processes). © 2018

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 129, p. 123-134
Keywords [en]
Adsorption, Antioxidant activity, Kraft lignin, Solvent fractionation, Structural analysis, Thermal stability, Acetone, Antioxidants, Aromatic compounds, Complexation, Driers (materials), Ethanol, Gel permeation chromatography, Hardwoods, Lignin, Nuclear magnetic resonance spectroscopy, Organic solvents, Softwoods, Structural properties, Thermodynamic stability, Water treatment, 31P-NMR spectroscopy, Adsorption properties, Analytical pyrolysis, Anti-oxidant activities, Softwood kraft lignins, Water treatment process, Thermogravimetric analysis, Eucalyptus, Picea
National Category
Polymer Technologies
Research subject
Mechanics of Materials
Identifiers
URN: urn:nbn:se:his:diva-16532DOI: 10.1016/j.indcrop.2018.11.067ISI: 000457504200015Scopus ID: 2-s2.0-85057882324OAI: oai:DiVA.org:his-16532DiVA, id: diva2:1274104
Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2019-02-21Bibliographically approved

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Moriana, Rosana

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