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

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.

Eta, Valeri (författare)
Mäki-Arvela, Päivi (författare)
Virtanen, Pasi (författare)
Lahtinen, Manu (författare)
Mikkola, Jyri-PekkaUmeå universitet,Kemiska institutionen,Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi University, Åbo-Turku, FI-20500, Finland(Swepub:umu)jymi0001 (författare)
Umeå universitetKemiska institutionen (creator_code:org_t)

Ingår i:Green Processing and Synthesis: Walter de Gruyter GmbH3:2, s. 147-1542191-95422191-9550

Av författaren/redakt...: Anugwom, Ikenna; Eta, Valeri; Mäki-Arvela, Päi ...; Virtanen, Pasi; Lahtinen, Manu; Mikkola, Jyri-Pe ...

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