The effect of switchable ionic liquid (SIL) treatment on the composition and crystallinity of birch chips (Betula pendula) using a novel alkanol amine-organic superbase-derived SIL
In: Green Processing and Synthesis, Jg. 3 (2014), Heft 2, S. 147-154
Online
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Zugriff:
Two-step treatment of birch chips (Betula pendula) was tested using diethanolamine (DEA)-1,8-diazabicyclo-[5.4.0]-undec-7-ene (DBU)-CO2-switchable ionic liquid (SIL), resulting in a 23% weight reduction in 24 h. The weight of the chips was reduced to 32% of their initial weight upon the second treatment with fresh SIL. SIL to wood ratio of 5:1, at 100°C for 24 h, without stirring, was applied in both steps. The relative amount of wood lignin reduced from 24% to 14% after two treatment cycles. The relative amount of cellulose of the undissolved fraction after SIL treatment increased from 43% (native birch wood) to 68% after the second cycle. Also, the undissolved material was efficiently fibrillated. The dissolved materials recovered from spent SIL, after treatment, contained high xylan content, about 90% of the total hemicelluloses, which was 85% of the recovered material. The powder X-ray diffraction (XRD) results revealed that the crystallinity of the undissolved material increased slightly, indicating dissolution of the amorphous material. Moreover, transformation of cellulose form I to form II in the remaining undissolved chips was not observed.
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The effect of switchable ionic liquid (SIL) treatment on the composition and crystallinity of birch chips (Betula pendula) using a novel alkanol amine-organic superbase-derived SIL
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Autor/in / Beteiligte Person: | Virtanen, Pasi ; Anugwom, Ikenna ; Mäki-Arvela, Päivi ; Eta, Valeri ; Mikkola, Jyri-Pekka ; Lahtinen, Manu |
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Zeitschrift: | Green Processing and Synthesis, Jg. 3 (2014), Heft 2, S. 147-154 |
Veröffentlichung: | De Gruyter, 2014 |
Medientyp: | unknown |
ISSN: | 2191-9550 (print) ; 2191-9542 (print) |
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