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Article

One-Step Lignin Refining Process: The Influence of the Solvent Nature on the Properties and Quality of Fractions

1
InnoRenew CoE, Livade 6, 6310 Izola, Slovenia
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Department of Chemical and Environmental Engineering, University of the Basque Country (UPV/EHU), Plaza Europa, 1, 20018 Donostia-San Sebastian, Spain
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Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska, Glagoljaška 8, 6000 Koper, Slovenia
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Andrej Marušič Institute, University of Primorska, Titov trg 4, 6000 Koper, Slovenia
*
Author to whom correspondence should be addressed.
Academic Editor: Luis Alves
Polymers 2022, 14(12), 2363; https://doi.org/10.3390/polym14122363
Received: 14 May 2022 / Revised: 8 June 2022 / Accepted: 8 June 2022 / Published: 11 June 2022
(This article belongs to the Special Issue Lignin Based Materials: Structure, Properties and Applications)
Heterogeneity of kraft lignin is one of the main limitations for the development of high-performance applications. Therefore, refining lignin using organic solvents is a promising strategy to obtain homogenous fractions with controlled quality in terms of structure and properties. In this work, one-step refining processes for hardwood kraft lignin using nine organic solvents of different chemical nature and polarity were carried out with the aim of investigating and understanding the effect of the type of organic solvent on the quality of resulting fractions. Structural features of both soluble and insoluble lignin fractions were assessed by GPC, Py-GC-MS, and FTIR linked to PCA analysis. Moreover, functional properties such as physical appearance, hygroscopicity, antioxidant capacity, and thermal properties were evaluated. The results evidenced the relationship between the nature and polarity of the solvents and the properties of the obtained soluble and insoluble fractions. View Full-Text
Keywords: hardwood kraft lignin; one-step fractionation; organic solvents; hygroscopicity; thermal properties; antioxidant capacity hardwood kraft lignin; one-step fractionation; organic solvents; hygroscopicity; thermal properties; antioxidant capacity
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MDPI and ACS Style

Gordobil, O.; Diaz, R.H.; Sandak, J.; Sandak, A. One-Step Lignin Refining Process: The Influence of the Solvent Nature on the Properties and Quality of Fractions. Polymers 2022, 14, 2363. https://doi.org/10.3390/polym14122363

AMA Style

Gordobil O, Diaz RH, Sandak J, Sandak A. One-Step Lignin Refining Process: The Influence of the Solvent Nature on the Properties and Quality of Fractions. Polymers. 2022; 14(12):2363. https://doi.org/10.3390/polym14122363

Chicago/Turabian Style

Gordobil, Oihana, René Herrera Diaz, Jakub Sandak, and Anna Sandak. 2022. "One-Step Lignin Refining Process: The Influence of the Solvent Nature on the Properties and Quality of Fractions" Polymers 14, no. 12: 2363. https://doi.org/10.3390/polym14122363

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