Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 265, Issue -, Pages 578-584Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2018.06.021
Keywords
Kraft lignin; Dissolution; Organic solvents; Ionic liquids; Deep eutectic solvents
Funding
- Portuguese Foundation for Science and Technology (FCT) [PTDC/AGR-TEC/4814/2014, IF/01005/2014]
- Portuguese Foundation for Science and Technology (FCT) through the project ReFloRest [30619, 02/SAICT/2017]
- FCT [SFRH/BD/132835/2017, PEstOE/QUI/UI0313/2013]
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During the last decades, the demand for sustainable and renewable resources has greatly increased. It is clear that biomass exploitation in general, and lignin in particular, will play a key role toward a sustainable and environmental prosperous society. Lignin is a three-dimensional amorphous polymer, mainly found in the cell wall of woody tree species, quite abundant and renewable natural bioresource capable to become in the near future a usual chemical feedstock for many materials of added value. However, its physicochemical understanding is still poor in comparison to other polymers, most likely due to its complexity. Its dissolution, as an often required first step for several production processes and applications, is typically complicated. Nevertheless, a wide variety of solvents for lignin have already been developed and, among them, organic solvents, ionic liquids and deep eutectic solvents are particularly relevant. In this brief treatise, the general features of lignin dissolution are reviewed as the drawbacks and virtues of lignin solvents and appropriate dissolution conditions. (C) 2018 Elsevier B.V. All rights reserved.
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