Can ionic liquids dissolve wood?: Processing and analysis of lignocellulosic materials with 1-n-butyl-3-methylimidazolium chloride
Can ionic liquids dissolve wood?: Processing and analysis of lignocellulosic materials with 1-n-butyl-3-methylimidazolium chloride
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DOI：
10.1039/b607614a
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发表时间：
2007-01-01
期刊：
影响因子：
9.8
通讯作者：
Rogers, Robin D.
中科院分区：
文献类型：
--
作者：
Fort, Diego A.;Remsing, Richard C.;Rogers, Robin D.
目前工业上使用的大部分纤维素是通过硫酸盐法制浆从木材中分离出来的，硫酸盐法制浆传统上涉及大量对环境有害的化学物质，并且是“非绿色”的。在这份报告中，我们提出了一种简单而新颖的替代方法，用于处理木质纤维素材料，该方法依赖于它们在基于离子液体（IL）氯化1-正丁基-3-甲基咪唑鎓（[C（4）mim]Cl）的溶剂系统中的溶解度。不同硬度的木材的溶出曲线，强调直接分析的纤维素材料和木质素含量在所得的液体通过常规的C-13 NMR技术。我们还表明，纤维素可以很容易地从IL-基木液中重组，通过添加各种沉淀溶剂，在公平的产量。光谱和热重研究表明，以这种方式获得的多糖几乎不含木质素和半纤维素，并具有与经受类似加工条件的纯纤维素样品相当的特性。
The bulk of the cellulose currently employed by industry is isolated from wood through Kraft pulping, a process which traditionally involves a barrage of environmentally detrimental chemicals and is undeniably 'non-green.' In this report we present a simple and novel alternative approach for the processing of lignocellulosic materials that relies on their solubility in solvent systems based on the ionic liquid (IL) 1-n-butyl-3-methylimidazolium chloride ([C(4)mim]Cl). Dissolution profiles for woods of different hardness are presented, making emphasis on the direct analysis of the cellulosic material and lignin content in the resulting liquors by means of conventional C-13 NMR techniques. We also show that cellulose can be readily reconstituted from the IL-based wood liquors in fair yields by the addition of a variety of precipitating solvents. Spectroscopic and thermogravimetric studies indicate that the polysaccharide obtained in this manner is virtually free of lignin and hemicellulose and has characteristics that are comparable to those of pure cellulose samples subjected to similar processing conditions.