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Open AccessArticle

Chemical Composition and Thermal Behavior of Kraft Lignins

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Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, 81237 Bratislava, Slovakia
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Faculty of Wood Sciences and Technology, Technical University in Zvolen, 96053 Zvolen, Slovakia
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Faculty of Forestry and Wood Sciences, Czech University of Life Sciences in Prague, 16521 Prague 6, Czech Republic
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Faculty of Forestry, Technical University in Zvolen, 96053 Zvolen, Slovakia
*
Author to whom correspondence should be addressed.
Forests 2019, 10(6), 483; https://doi.org/10.3390/f10060483
Received: 6 April 2019 / Revised: 9 May 2019 / Accepted: 29 May 2019 / Published: 3 June 2019
(This article belongs to the Special Issue Forest Biorefinery)
Lignin has great potential for utilization as a green raw material or as an additive in various industrial applications, such as energy, valuable chemicals, or cost-effective materials. In this study, we assessed a commercial form of lignin isolated using LignoBoost technology (LB lignin) as well as three other types of lignin (two samples of non-wood lignins and one hardwood kraft lignin) isolated from the waste liquors produced during the pulping process. Measurements were taken for elemental analysis, methoxyl and ash content, higher heating values, thermogravimetric analysis, and molecular weight determination. We found that the elemental composition of the isolated lignins affected their thermal stability, activation energies, and higher heating values. The lignin samples examined showed varying amounts of functional groups, inorganic component compositions, and molecular weight distributions. Mean activation energies ranged from 93 to 281 kJ/mol. Lignins with bimodal molecular weight distribution were thermally decomposed in two stages, whereas the LB lignin showing a unimodal molecular weight distribution was decomposed in a single thermal stage. Based on its thermal properties, the LB lignin may find direct applications in biocomposites where a higher thermal resistance is required. View Full-Text
Keywords: lignin; chemical composition; thermal degradation; activation energy; methoxyl groups; molecular weight distribution lignin; chemical composition; thermal degradation; activation energy; methoxyl groups; molecular weight distribution
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MDPI and ACS Style

Ház, A.; Jablonský, M.; Šurina, I.; Kačík, F.; Bubeníková, T.; Ďurkovič, J. Chemical Composition and Thermal Behavior of Kraft Lignins. Forests 2019, 10, 483.

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