水热预处理耦合高沸醇从核桃壳提取高品质木质素  

Extraction of High-quality Lignin Using High Boiling Solvent Coupling with Hydrothermal Pretreatment from Walnut Shell

作　　者：常森林 李宏强[1] 徐建[1] 

机构地区：[1]中国科学院过程工程研究所生化工程国家重点实验室,北京100190

出　　处：《食品工业》2017年第4期86-90,共5页The Food Industry

基　　金：国家自然科学基金(No.21276259)提供

摘　　要：高沸醇提取木质素工艺流程简单、不引入新杂质,并且得到的木质素分散性好、纯度高、基团活性强,但是木质素产品仍含有6%~8%半纤维素。水热预处理可以去除原料中的半纤维素,同时一定程度破坏原料原有复杂结构,有利于木质素提取在更为温和的条件下进行。将水热预处理和高沸醇提取木质素两种绿色工艺相结合,从木质素提取的工艺参数(预处理强度、温度、时间、固液比和1,4-丁二醇浓度)设计正交试验,用以研究各参数对木质素提取率、木质素纯度的影响,从而得到更为适宜的木质素提取条件。结果表明,在水热预处理强度4.22、温度160℃、时间4 h、固液比1∶8(g/m L)、1,4-丁二醇浓度40%的条件下,将会获得品质最佳的木质素。The high boiling solvent process has some advantages such as process simple, no introduced impurity. And the lignin obtained has a good dispensability and high purity. Besides, the lignin group activity has been kept well. However, the lignin products contain 6%-8% hemicellulose. Hydrothermal pretreatment can remove most hemicellulose in the material. At the same time, the original complex structure of the raw material is somewhat changed which maybe have the extraction of lignin completed under milder conditions. This work adopts hydrothermal pretreatment coupling with high boiling solvent extracting lignin. With the co-working of these two green technologies, the experiment is carried out by the study of the parameters （such as pretreatment severity, temperature, time, solid-liquid ratio and concentration of 1, 4-butanediol）. And orthogonal experiment is designed in order to study the effects of the parameters on the purity oflignin, lignin extraction yield, finally obtained the optimum condition. The obtained optimum condition is pretreatment severity 4.22, temperature 160℃, time 4 h, solid-to-liquid 1 ： 8 （g/mL）, and 1,-4-butanediol concentration 40%, at which the best lignin will be achieved.

关 键 词：核桃壳 木质素 水热预处理 高沸醇 

分 类 号：O636.2[理学—高分子化学]