Journal
POLYMERS
Volume 14, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/polym14204319
Keywords
deep eutectic solvents; circular economy; lignin valorisation; green extraction process; microwave; lignin valorisation
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Funding
- federal state of Salzburg
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This research investigates the suitability of different choline-chloride-based deep eutectic solvents for microwave lignin extraction. The study presents an efficient and fast method to extract lignin from untreated larch bark using deep eutectic solvents in a standard domestic microwave. The extraction process is straightforward, green, and cost-effective.
The current research intended to investigate the suitability of different choline-chloride-based deep eutectic solvents for their role in microwave lignin extraction. Lignin, a widely spread biopolymer in plants and woody structures, is a valuable replacement for fossil-fuel-based materials. While some promising applications have been trialled already, the extraction of this material from its matrix still causes problems. Here, we highlight an efficient and fast method to extract lignin from untreated larch bark with deep eutectic solvents in a standard domestic microwave. We developed a straightforward, green methodology, which can be used on various reaction scales, with materials available to many researchers. Lignin was extracted within only 30 min of microwave irradiation in yields of up to 96%. Compared to traditional deep eutectic extraction by conventional heating, the reaction time was cut by 87% and the energy costs were reduced by 93.5%. The hydrogen bond donors were exchanged and different types, namely acid-based, hydroxyl-based and amide-based donor systems, were evaluated for their suitability concerning microwave lignin extraction. This study presents a novel approach towards energy-efficient and green lignin valorisation, without the inherent need for costly equipment.
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