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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
- Anugwom, Ikenna (author)
- Eta, Valeri (author)
- Mäki-Arvela, Päivi (author)
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- Virtanen, Pasi (author)
- Lahtinen, Manu (author)
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- (creator_code:org_t)
- Walter de Gruyter GmbH, 2014
- 2014
- English.
- In: Green Processing and Synthesis. - : Walter de Gruyter GmbH. - 2191-9542 .- 2191-9550. ; 3:2, s. 147-154
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- birch chips
- crystallinity
- effective fibrillation
- mild treatment
- switchable ionic liquid (SIL)
Publication and Content Type
- ref (subject category)
- art (subject category)
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