Switchable ionic liquids as delignification solvents for lignocellulosic materials
2014 (English)In: ChemSusChem, ISSN 1864-5631, Vol. 7, no 4, 1170-1176 p.Article in journal (Refereed) Published
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).
Place, publisher, year, edition, pages
John Wiley & Sons, 2014. Vol. 7, no 4, 1170-1176 p.
alkanol amines; biomass; delignification; ionic liquids; organic superbases
IdentifiersURN: urn:nbn:se:umu:diva-87822DOI: 10.1002/cssc.201300773ISI: 000333754200027PubMedID: 24616172OAI: oai:DiVA.org:umu-87822DiVA: diva2:711648