选择性分离植物纤维木质素的开关型DES预处理体系的构建及展望

Construction and Prospect of Switchable DES for Selective Extraction of Lignin from Plant Fiber

中文关键词:  低共熔溶剂  木质素  预处理  选择性分离

Key Words:deep eutectic solvent  lignin  pretreatment  selective extraction

中文摘要:

      利用低共熔溶剂（DES）对植物纤维木质素进行分离提取，可以克服传统植物纤维预处理过程中存在的处理效率低、溶剂损失大和木质素降解严重等技术难题。为提高木质素提取率，选用的DES一般具有较强的极性，在处理植物纤维后，其与碳水化合物组分不易分离，而且DES回收较为困难。针对上述问题，基于DES体系的作用机理和溶剂特性，研究构建了开关型DES，可在提取木质素时强化DES的极性，提高木质素提取率；在回收DES过程中将其转化为非极性，提高DES的回收率。构建低成本、高效率、可持续提取木质素的开关型DES预处理方法，可进一步丰富植物纤维预处理技术理论体系。

Abstract:

      Deep eutectic solvent （DES） pretreatment overcomes the defects of low efficiency， great solvent loss， and severe lignin decomposition that exits in the traditional pretreatment methods for plant fiber lignin extraction. DES with strong polarity is commonly used to improve the lignin extraction efficiency. However， poor recyclability is commonly induced， due to their affinity to the hydrocarbon components. Aiming at the above problems and based on the mechanism of action and solvent properties， a novel switchable DES system with switchable polarity is proposed， which could enhance polarity during the lignin extraction process to improve the extraction efficiency， and switch to nonpolar solvent during the recycling process to improve the recyclability of DES. The switchable DES could provide a low-cost， high-efficiency， and sustainable method for lignin extraction， facilitating the development of plant fiber pretreatment technology.