Ionic liquid as a green solvent for lignin
Ionic liquid as a green solvent for lignin
复制标题
DOI：
10.1080/02773810701282330
复制
发表时间：
2007-01-01
影响因子：
2
通讯作者：
Ragauskas, Arthur J.
中科院分区：
文献类型：
--
作者：
Pu, Yunqiao;Jiang, Nan;Ragauskas, Arthur J.
本研究考察了离子液体作为木质素非质子绿色溶剂的应用。采用从松木硫酸盐浆中分离的木质素进行溶解实验。最多20wt%的木质素可以溶解在[hmim][CF 3SO 3]、[mmim][MeSO 4]和[bmim][MeSO 4]中。在含[bmim]（+）离子液体中，木质素对不同阴离子的溶解度顺序为：[MeSO 4]（-）> Cl-，类似于Br- > [PF 6]（-），表明木质素的溶解度主要受阴离子性质的影响。含有大的非配位阴离子[PF 4]（-）和[PF 6]（-）的离子液体不适合作为木质素的溶剂。木质素和模型化合物的C-13核磁共振（NMR）分析显示，与使用二甲基亚砜（DMSO）作为溶剂获得的C-13 NMR数据相比，使用离子液体作为溶剂的C-13信号向高场移动Δ 0.1至1.9ppm。
This study examined the application of select ionic liquids (ILs) as aprotic green solvents for lignin. Dissolution experiments were carried out employing lignin isolated from pine kraft pulp. Up to 20 wt% lignin could be dissolved in [hmim][CF3SO3], [mmim][MeSO4] and [bmim][MeSO4]. For the [bmim](+)-containing ionic liquids, the order of lignin solubility for varying anions was: [MeSO4](-) > Cl- similar to Br- >>> [PF6](-), indicating that the solubility of lignin was principally influenced by the nature of the anions. Ionic liquids containing large, non-coordinating anions [PF4](-) and [PF6](-) were unsuitable as a solvent for lignin. C-13 nuclear magnetic resonance (NMR) analyses of lignin and model compounds showed that C-13 signals using ionic liquid as a solvent were shifted up-field by delta 0.1 to 1.9 ppm in comparison to C-13 NMR data acquired using dimethyl sulfoxide (DMSO) as the solvent.