协同深共晶溶剂-氢解预处理从杨木中制备低缩合木质素和高纯度纤维素。
Low-condensed lignin and high-purity cellulose production from poplar by synergistic deep eutectic solvent-hydrogenolysis pretreatment.
机构信息
Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province, National Engineering Lab. for Biomass Chemical Utilization, Nanjing 210042, China.
Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province, National Engineering Lab. for Biomass Chemical Utilization, Nanjing 210042, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
出版信息
Bioresour Technol. 2022 Nov;363:127905. doi: 10.1016/j.biortech.2022.127905. Epub 2022 Sep 7.
This paper presented a green and environmentally friendly method to obtain lignin with a structure similar to milled wood lignin (MWL) and high-purity cellulose from biomass in a two-step process. The first step, maleic acid (MA), choline chloride (ChCl), and ethylene glycol (EG) ternary deep eutectic solvent (DES) pretreatment was performed to obtain lignin with less-condensed structure. The results showed that the obtained lignin had similar properties to MWL under the condition (MA/ChCl/EG = 1:5:15, 80°C, 10 h). The DES recovered still had good cycle performance. The second step, the cellulose-rich residue was hydrogenated with isopropanol-water solvent and Raney nickel to obtain high-purity cellulose. The results showed that the purity of cellulose obtained by catalytic hydrogenolysis was > 94%. The glucose yield after enzymatic hydrolysis was 243.72 mg/g, which was 14.7 times higher than the untreated poplar. Overall, this work was of great significance for the effective separation of biomass.
本文提出了一种绿色环保的方法，通过两步法从生物质中获得结构类似于磨木木素（MWL）的木质素和高纯度纤维素。第一步，采用马来酸（MA）、氯化胆碱（ChCl）和乙二醇（EG）三元深共晶溶剂（DES）预处理，得到缩合程度较低的木质素。结果表明，在条件（MA/ChCl/EG=1:5:15，80°C，10 h）下，得到的木质素具有与 MWL 相似的性质。回收的 DES 仍具有良好的循环性能。第二步，用异丙醇-水溶剂和雷尼镍将富含纤维素的残渣氢化，得到高纯度纤维素。结果表明，催化氢解得到的纤维素的纯度大于 94%。酶解后的葡萄糖得率为 243.72 mg/g，是未经处理的杨木的 14.7 倍。总的来说，这项工作对于生物质的有效分离具有重要意义。
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