Carbohydrate Polymers 181 (2018) 778–784 Contents lists available at ScienceDirect Carbohydrate Polymers journal homepage: www.elsevier.com/locate/carbpol Li Liu , Zhenrui Li, Wuxin Hou, Haiyan Shen School of Chemistry, Dalian University of Technology, Dalian 116024, China ARTICLE I NFO ABSTRACT Keywords: Acidic ionic liquid (IL) [C SO Hmim]HSO was applied to catalyze lignocellulose conversion to levulinic acid 3 3 4 Biomass (LA) in one pot with high selectivity under hydrothermal conditions. Through the optimization of reaction Lignocellulose conditions, the highest yield of LA is 96.6 mol% (21.6 wt%) based on the amount of C6-sugars in the straw. The Ionic liquids relationship between IL structure and LA yield was established, disclosing that acidity and hydrogen bonding Levulinic acid ability of anions are crucial to the yield of LA. Moreover, the LA product can be readily separated through Humins extraction by methyl isobutyl ketone (MIBK) and IL can be reused over 5 cycles without loss of activity. In addition, the chemical structures and morphologies of the solid residues were investigated by DTG, SEM and IR, demonstrating the gradual conversion process of cellulose and hemicellulose accompanied by the formation of humin byproducts, whereas the lignin fraction of the straw sustains the scaﬀold structure without
Carbohydrate Polymers – Elsevier
Published: Feb 1, 2018
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