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Characterization of lignin at pre-pyrolysis temperature to investigate its melting problem
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden ; Nippon Paper Industries Co., Japan.
KTH Royal Institute of Technology, Sweden.
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2019 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 235, p. 1061-1069Article in journal (Refereed) Published
Abstract [en]

Technical lignin particles melt under relatively low temperature. This results in the problem in the continuous feeding and fluidization during lignin pyrolysis, which in turn limits its utilization on a large scale. In this study, two most available types of lignin have been used to investigate the lignin melting problem, which are Kraft lignin (KL) from pulping process and hydrolysis lignin (HL) from bio-ethanol production process. Elemental composition, thermal property and thermally decomposed derivatives of each sample are tested by elemental analyzer, TGA, DSC, and Py-GC/MS. Morphology, structure and crystal change before and after heat treatment are tested by microscopy, FTIR and XRD. All results suggest that lignin structure determines its melting properties. Kraft lignin from pulping process contains a less cross-linked structure. It melts under heating. On the other hand, hydrolysis lignin from hydrolysis process contains a highly crossed-linked and condensed structure. It does not melt before decomposition under heat treatment. Modifying lignin structure is suggested for the resolution of technical lignin melting problem.

Place, publisher, year, edition, pages
2019. Vol. 235, p. 1061-1069
Keywords [en]
Hydrolysis lignin (HL), Kraft lignin (KL), Melting properties, Structure
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-35219DOI: 10.1016/j.fuel.2018.08.120Scopus ID: 2-s2.0-85052512069OAI: oai:DiVA.org:ri-35219DiVA, id: diva2:1254799
Available from: 2018-10-10 Created: 2018-10-10 Last updated: 2018-10-10Bibliographically approved

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