Switchable ionic liquids as delignification solvents for lignocellulosic materials

The transformation of lignocellulosic materials into potentially valuable resources is compromised by their complicated structure. Consequently, new economical and feasible conversion/fractionation techniques that render value-added products are intensely investigated. Herein an unorthodox and feasible fractionation method of birch chips (B. pendula) using a switchable ionic liquid (SIL) derived from an alkanol amine (monoethanol amine, MEA) and an organic super base (1,8-diazabicyclo-[5.4.0]-undec-7-ene, DBU) with two different trigger acid gases (CO2 and SO2 ) is studied. After SIL treatment, the dissolved fractions were selectively separated by a step-wise method using an antisolvent to induce precipitation. The SIL was recycled after concentration and evaporation of anti-solvent. The composition of undissolved wood after MEA-SO2 -SIL treatment resulted in 80 wt % cellulose, 10 wt % hemicelluloses, and 3 wt % lignin, whereas MEA-CO2 -SIL treatment resulted in 66 wt % cellulose, 12 wt % hemicelluloses and 11 wt % lignin. Thus, the MEA-SO2 -SIL proved more efficient than the MEA-CO2 -SIL, and a better solvent for lignin removal. All fractions were analyzed by gas chromatography (GC), Fourier transform infrared spectroscopy (FT-IR), (13) C nuclear magnetic resonance spectroscopy (NMR) and Gel permeation chromatography (GPC).

Eta, Valerie (författare)
Virtanen, Pasi (författare)
Mäki-Arvela, Päivi (författare)
Hedenström, MattiasUmeå universitet,Kemiska institutionen(Swepub:umu)mashem96 (författare)
Hummel, Michael (författare)
Sixta, Herbert (författare)
Mikkola, Jyri-PekkaUmeå universitet,Kemiska institutionen(Swepub:umu)jymi0001 (författare)
Umeå universitetKemiska institutionen (creator_code:org_t)

Av författaren/redakt...: Anugwom, Ikenna; Eta, Valerie; Virtanen, Pasi; Mäki-Arvela, Päi ...; Hedenström, Matt ...; Hummel, Michael; visa fler...; Sixta, Herbert; Mikkola, Jyri-Pe ...; visa färre...

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