文献类型：期刊文献

英文题名：Integrated Separation Process of C5 Sugars and Phenolics from Poplar Wood Using CO2-Assisted Hydrolysis Followed by Hydrogenolysis

作者：Zhai, Qiaolong[1] Li, Fanglin[1] Long, Feng[1] Wang, Fei[1] Jiang, Jianchun[1] Hse, Chung-Yun[2] Xu, Junming[1]

第一作者：Zhai, Qiaolong

通信作者：Xu, Junming

机构：[1] Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, National Engineering Laboratory for Biomass Chemical Utilization, Key and Open Laboratory on Forest Chemical Engineering, SFA, Key Laboratory of Biomass Energy and Material, Nanjing, 210042, China; [2] Southern Research Station, United States Department of Agriculture [USDA] Forest Service, Pineville, LA, 71360, United States

年份：2019

卷号：7

期号：1

起止页码：526-536

外文期刊名：ACS Sustainable Chemistry and Engineering

收录：EI(收录号：20190206363646)

基金：The authors thank the financial support provided by the National Natural Science Foundation of China (31530010) for this investigation.

语种：英文

外文关键词：Biomass - Carbon dioxide - Hydrogenolysis - Lignin - Lignocellulosic biomass - Sugars

摘要：This study presents an efficient methodology to remove hemicellulose and lignin from lignocellulosic biomass by a three-step process to obtain C5 sugars, phenolics and high purity cellulose. The first step, a CO2-assisted hydrolysis pretreatment was conducted for the selective extraction of the hemicellulose fraction. The process effectively extracted hemicellulose at 180 °C with CO2 at 20 bar initial pressure for 10 min, during which a variety of monosaccharides and other intermediates were obtained. The second step, the catalytic hydrogenolysis of the pretreated feedstock, was performed in a cosolvent isopropyl alcohol-water system with Raney Ni as the catalyst, which can catalyze the depolymerization of lignin components for phenolic products. A variety of phenolic components with lower molecular weights were detected via GC-MS and HSQC. Further treatment with alkaline hydrogen peroxide was used to extract the remaining small amount of lignin and hemicellulose fractions in biomass and to obtain high purity cellulose (>96%). Characterization results indicated that 96% of the lignin and 99% of the hemicellulose could be fractionated by the three-step treatment. This method can be used for the efficient fractionation of hemicellulose, cellulose and lignin, thus achieving high valorization of the entire biomass. ? Copyright 2018 American Chemical Society.