Impact of Ionic Liquid 1-Ethyl-3-Methylimidazolium Acetate Mediated Extraction on Lignin Features  

作　　者：Idi Guga Audu Isabelle Ziegler-Devin Heiko Winter Martina Bremer Anton Hoffmann Steffen Fischer Marie-Pierre Laborie Nicolas Brosse 

机构地区：[1]Chair of Forest Biomaterials, University of Freiburg, Freiburg, Germany [2]LERMaB, Faculty of Science and Technology, University of Lorraine, Nancy, France [3]Freiburg Materials Research Center (FMF), Freiburg, Germany [4]Institute of Plant and Wood Chemistry, Technische Universitä t Dresden, Dresden, Germany

出　　处：《Green and Sustainable Chemistry》2017年第2期114-140,共27页绿色与可持续化学（英文）

摘　　要：This study aims at investigating the impact of ionic liquid extraction on lignin structure by studying the mechanism of lignin depolymerization in 1-ethyl-3-methylimidazolium acetate EMIM[OAc]) and comparing it with that of organosolv and milled wood methods. Ionic liquid mediated lignin (ILL) using EMIM[OAc]), ethanol organosolv lignin (EOL) and milled wood lignin (MWL) were isolated from Typha capensis (TC) and subjected to several analytical characterizations. Experimental data shows that ILL exhibited a relatively lower degree of condensation, lower aromatic C-C structures and a higher aliphatic OH with values of 0.42/Ar, 1.94/Ar and 1.33/Ar moieties compared with EOL values of 0.92/Ar, 2.22/Ar and 0.51/Ar moieties respectively. The ILL was depolymerized under mild conditions giving relatively higher β-aryl ether linkages content, higher molecular mass, and exhibited closer structures and reactivity to native lignin than EOL. These insights on TC lignin depolymerization in EMIM[OAc]) acetate may contribute to better value-addition of lignocellulosic biomass.This study aims at investigating the impact of ionic liquid extraction on lignin structure by studying the mechanism of lignin depolymerization in 1-ethyl-3-methylimidazolium acetate EMIM[OAc]) and comparing it with that of organosolv and milled wood methods. Ionic liquid mediated lignin (ILL) using EMIM[OAc]), ethanol organosolv lignin (EOL) and milled wood lignin (MWL) were isolated from Typha capensis (TC) and subjected to several analytical characterizations. Experimental data shows that ILL exhibited a relatively lower degree of condensation, lower aromatic C-C structures and a higher aliphatic OH with values of 0.42/Ar, 1.94/Ar and 1.33/Ar moieties compared with EOL values of 0.92/Ar, 2.22/Ar and 0.51/Ar moieties respectively. The ILL was depolymerized under mild conditions giving relatively higher β-aryl ether linkages content, higher molecular mass, and exhibited closer structures and reactivity to native lignin than EOL. These insights on TC lignin depolymerization in EMIM[OAc]) acetate may contribute to better value-addition of lignocellulosic biomass.

关 键 词：1-Ethyl-3-Methylimidazolium ACETATE Ionic Liquid LIGNIN Ethanol ORGANOSOLV LIGNIN LIGNIN DEPOLYMERIZATION Milled Wood LIGNIN 

分 类 号：O6[理学—化学]