Microwave-assisted dissolution and delignification of wood in 1-ethyl-3-methylimidazolium acetate
2013
Wang, Hui | Maxim, Mirela L. | Gurau, Gabriela | Rogers, Robin D.
Microwave irradiation can facilitate the dissolution and delignification of lignocelluloses in ionic liquids compared to simple oil bath heating as demonstrated here where 92.5% of 0.5g ground southern yellow pine was dissolved in 10g 1-ethyl-3-methylimidazolium acetate using microwave irradiation in only 4min. Cellulose-rich material (pulp) regenerated from the wood/ionic liquid solution had a lignin content of ∼10%; significantly lower than the lignin content of the original wood (31.9%) or that of pulp obtained from the same experiment but using 16h of oil bath heating (16–24%). The 10% lignin content obtained with the microwave method was close to that of pulp obtained from the oil bath heating method when polyoxometalate catalysts were used (5–9%).
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