文献类型：期刊文献

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

作者：Zhai, Qiaolong[1,2,3,4] Li, Fanglin[1,2,3,4] Long, Feng[1,2,3,4] Wang, Fei[1,2,3,4] Jiang, Jianchun[1,2,3,4] Hse, Chung-Yun[5] Xu, Junming[1,2,3,4]

第一作者：Zhai, Qiaolong

通信作者：Xu, JM[1];Xu, JM[2];Xu, JM[3];Xu, JM[4]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Jiangsu, Peoples R China;[2]Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Jiangsu, Peoples R China;[3]SFA, Key & Open Lab Forest Chem Engn, Nanjing 210042, Jiangsu, Peoples R China;[4]Key Lab Biomass Energy & Mat, Nanjing 210042, Jiangsu, Peoples R China;[5]US Forest Serv, Southern Res Stn, USDA, Pineville, LA 71360 USA

年份：2019

卷号：7

期号：1

起止页码：526-536

外文期刊名：ACS SUSTAINABLE CHEMISTRY & ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000455288800055)】；

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 fractionation; Hemicellulose; Hydrolysis; Lignin; Catalytic hydrogenolysis; High-purity cellulose

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 degrees 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.