title: Aromatics extraction from pyrolytic sugars using ionic liquid to enhance sugar fermentability.
abstract: Fermentative bioethanol production from pyrolytic sugars was improved via aromatics removal by liquid-liquid extraction. As solvents, the ionic liquid (IL) trihexyltetradecylphosphonium dicyanamide (P666,14[N(CN)2]) and ethyl acetate (EA) were compared. Two pyrolytic sugar solutions were created from acid-leached and untreated pinewood, with levoglucosan contents (most abundant sugar) of 29.0% and 8.3% (w/w), respectively. In a single stage extraction, 70% of the aromatics were effectively removed by P666,14[N(CN)2] and 50% by EA, while no levoglucosan was extracted. The IL was regenerated by vacuum evaporation (100mbar) at 220°C, followed by extraction of aromatics from fresh pyrolytic sugar solutions. Regenerated IL extracted aromatics with similar extraction efficiency as the fresh IL, and the purified sugar fraction from pretreated pinewood was hydrolyzed to glucose and fermented to ethanol, yielding 0.46g ethanol/(g glucose), close to the theoretical maximum yield.
authors.affiliation: University of Twente, Sustainable Process Technology Group, Faculty of Science and Technology, Postbus 217, 7500 AE Enschede, The Netherlands.
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Li
authors.affiliation: The University of Western Ontario, Department of Chemical and Biochemical Engineering, Institute for Chemicals and Fuels from Alternative Resources, London, Ontario N6A 5B9, Canada.
authors.forename: Luis C
authors.initials: LC
authors.lastname: Luque-Moreno
authors.affiliation: University of Twente, Sustainable Process Technology Group, Faculty of Science and Technology, Postbus 217, 7500 AE Enschede, The Netherlands.
authors.forename: Stijn R G
authors.initials: SR
authors.lastname: Oudenhoven
authors.affiliation: The University of Western Ontario, Department of Chemical and Biochemical Engineering, Institute for Chemicals and Fuels from Alternative Resources, London, Ontario N6A 5B9, Canada.
authors.forename: Lars
authors.initials: L
authors.lastname: Rehmann
authors.affiliation: University of Twente, Sustainable Process Technology Group, Faculty of Science and Technology, Postbus 217, 7500 AE Enschede, The Netherlands.
authors.forename: Sascha R A
authors.initials: SR
authors.lastname: Kersten
authors.affiliation: University of Twente, Sustainable Process Technology Group, Faculty of Science and Technology, Postbus 217, 7500 AE Enschede, The Netherlands. Electronic address: b.schuur@utwente.nl.
authors.forename: Boelo
authors.initials: B
authors.lastname: Schuur
mesh_terms: D019149:Bioreactors; D002241:Carbohydrates / Q000737:chemistry* / Q000302:isolation & purification; D000431:Ethanol / Q000138:chemical synthesis*; D005285:Fermentation; D006868:Hydrolysis; D052578:Ionic Liquids / Q000737:chemistry*; D059625:Liquid-Liquid Extraction; D012997:Solvents; D014934:Wood / Q000737:chemistry*
chemical_list: D002241:Carbohydrates; D052578:Ionic Liquids; D012997:Solvents; D000431:Ethanol
keywords: Aromatics; Fermentation; Ionic liquid; Pyrolysis oil; Sugar fractions