文献类型：期刊文献

英文题名：Selective Cleavage of the Aryl Ether Bonds in Lignin for Depolymerization by Acidic Lithium Bromide Molten Salt Hydrate under Mild Conditions

作者：Yang, Xiaohui[1,2] Li, Ning[2] Lin, Xuliang[2] Pan, Xuejun[2] Zhou, Yonghong[1]

第一作者：Yang, Xiaohui;杨晓慧

通信作者：Pan, XJ[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forestry Prod, Nanjing 210042, Jiangsu, Peoples R China;[2]Univ Wisconsin, Dept Biol Syst Engn, Madison, WI 53706 USA

年份：2016

卷号：64

期号：44

起止页码：8379-8387

外文期刊名：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

收录：;EI(收录号：20164603025360);Scopus(收录号：2-s2.0-84994689585);WOS:【SCI-EXPANDED(收录号:WOS:000387624900013)】；

基金：The authors thank the China Scholarship Council (CSC) for supporting X.Y. to conduct this research at the University of Wisconsin-Madison. This work was partially supported by grants from the NSF (CBET 1159561 and CBET 1236562) and USDA McIntire Stennis (WIS01597) to X.P.

语种：英文

外文关键词：lignin; depolymerization; lithium bromide; inorganic molten salt hydrate; aryl ether bond

摘要：The present study demonstrates that the concentrated lithium bromide (LiBr) solution with acid as catalyst was able to selectively cleave the beta-O-4 aryl ether bond and lead to lignin depolymerization under mild conditions (e.g., in 60% LiBr with 0.3 M HCl at 110 degrees C for 2 h). Four industrial lignins from different pulping and biorefining processes, including softwood kraft lignin (SKL), hardwood kraft lignin (HKL), softwood ethanol organosolv lignin (EOL), and acid corncob lignin (ACL), were treated in the LiBr solution. The molecular weight, functional group, and interunit linkages of the lignins were characterized using GPC, FTIR, and NMR. The results indicated that the beta-O-4 aryl ether bonds of the lignins were selectively cleaved, and both LiBr and HCl played crucial roles in catalyzing the cleavage of the ether bonds.