低共熔溶剂预处理选择性脱除速生毛白杨半纤维素  

Selective Dissolution of Hemicellulose from Populus tomentosa Carr.by Deep Eutectic Solvent Pretreatment

作　　者：丁宇[1] 武书彬[1] DING Yu;WU Shubin(State Key Lab of Pulp and Paper Engineering,Experimental Teaching Demonstration Center of Light Industry and Food Science,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,轻工与食品国家级实验教学示范中心,广东广州510640

出　　处：《林产化学与工业》2024年第5期283-290,共8页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(32271807);广东省基础与应用基础研究基金项目(2024A1515011941)。

摘　　要：以毛白杨木为原料,采用甘油(Gly)、乙二醇(EG)分别与3种不同金属氯化盐(FeCl_(3)、AlCl_(3)、CuCl_(2))组成的6种二元低共熔溶剂(DES)体系,以及氯化胆碱(ChCl)与Gly或EG分别添加3种金属盐组成了6种三元DES体系,探究这些二元和三元DES体系对半纤维素选择性溶出的效果。以半纤维素去除率/木质素去除率比(R)值为评价指标,筛选出选择性溶出半纤维素效果最佳的DES,系统考察了DES配比、预处理温度、预处理时间对杨木中主要组分含量和半纤维素优先溶出的影响。实验结果表明:ChCl/EG/FeCl_(3)三元DES,当物质的量比为1∶2∶0.2在100℃下处理2 h,半纤维素和木质素去除率分别为45.01%和9.49%,R值高达4.74,表现出良好的优先溶出半纤维素的特性,同时采用FT-IR、BET、X射线衍射等方法,分析了优化条件下三元DES处理后杨木微观形貌与结构特性的变化,证明了ChCl/EG/FeCl_(3)三元DES在优化条件下可实现半纤维素选择性优先溶出,而木质素仅少量溶出。Using Populus tremula as raw material,glycerol(Gly)and ethylene glycol(EG)were used to form six binary alcohol deep eutectic solvent(DES)systems with three different metal chloride salts(FeCl_(3),AlCl_(3),and CuCl_(2)),respectively,as well as choline chloride(ChCl)with Gly or EG with the addition of three metal salts to form six ternary alcohol DES systems.The effects of these binary and ternary DESs on the selective solubilization of hemicellulose were investigated.The ratio of hemicellulose removal rate/lignin removal rate(R)was used as the evaluation index to screen out the DES with the best effect on the selective dissolution of hemicellulose.The effects of DES ratio,pretreatment temperature,and pretreatment time on the the main component content and the preferential dissolution of hemicellulose in poplar wood were systematically investigated.The experimental results showed that when the molar ratio of ChCl/EG/FeCl_(3)was 1∶2∶0.2 at 100℃for 2 h,the ternary DES of ChCl/EG/FeCl_(3)showed the hemicellulose and lignin removal rates of 45.01%and 9.49%,respectively,with the R value as high as 4.74,which demonstrated a good preferential solubilization of hemicellulose.Meanwhile,the methods of FT-IR,BET,and X-ray diffraction were used to analyze the changes of micro-morphology and structural properties of poplar wood treated with ternary DES under optimized conditions.It echoed the conclusion that the ternary DES of ChCl/EG/FeCl_(3)could achieve selective preferential solubilization of hemicellulose under optimized conditions while lignin only solubilized in a small amount.

关 键 词：半纤维素 低共熔溶剂 选择性溶出 杨木 

分 类 号：TQ35[化学工程]