Efficient enzymatic saccharification of Miscanthus: Energy-saving by combining dilute acid and ionic liquid pretreatments
2014
Auxenfans, Thomas | Buchoux, Sébastien | Husson, Eric | Sarazin, Catherine | Fractionnement des AgroRessources et Environnement (FARE) ; Université de Reims Champagne-Ardenne (URCA)-Institut National de la Recherche Agronomique (INRA) | Génie Enzymatique et Cellulaire (GEC) ; Université de Technologie de Compiègne (UTC)-Centre National de la Recherche Scientifique (CNRS)
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Show more [+] Less [-]English. Miscanthus x giganteus is currently being considered as a promising dedicated bio-energy crop. A cost-effective development of second-generation bioethanol involves energy-saving processes. We report here for the first time the feasibility to perform pre-treatments of Miscanthus with successive dilute acid then hydrophilic ionic liquids in mild conditions for an efficient energy-saving of enzymatic saccharification. Indeed, short time of pretreatments (20e40 min) with 1-ethyl-3-methylimidazolium methylphosphonate or 1-ethyl-3-methylimidazolium acetate [Emim] þ [CH 3 COO] À of dilute acid pretreated Mis-canthus can be carried out at room/mild temperature (25-45 °C). In these mild conditions, a significant improvement of saccharification performances was obtained in comparison with each single pretreatment (up to a factor 2) or untreated sample (about a factor 4). Synergistic effects between these two distinct pretreatments led to an efficient lignocel-lulosic biomass deconstruction in soft conditions, by cellulose separation from hemi-celluloses and lignin.
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