Key Laboratory of Green Process Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
Bioresour Technol. 2011 Sep;102(17):7959-65. doi: 10.1016/j.biortech.2011.05.064. Epub 2011 May 30.
In the present study, 1-allyl-3-methylimidazolium chloride (AmimCl), an ionic liquid (IL), was used to extract cellulose from pine, poplar, Chinese parasol, and catalpa wood chips. Results show that pine is the most suitable wood species for cellulose extraction with ILs. Its cellulose extraction rate can reach as high as 62% under optimized conditions and its cellulose content is as high as 85% when DMSO/water is used as the precipitant. The dissolution process can be clearly observed by hot stage optical microscopy, and the reaction time can be significantly reduced by microwave irradiation. (13)C CP/MAS NMR, FTIR, XRD, and SEM were used to analyze the cellulose-rich extracts of pine. Results show that IL dissolves pine wood by destroying inter and intramolecular hydrogen bonds between lignocelluloses. The major component of pine extract is cellulose with a homogeneous and dense structure. After extraction, AmimCl can be easily recycled and reused.
在本研究中，使用 1-烯丙基-3-甲基氯化咪唑鎓（AmimCl）离子液体（IL）从松木、杨木、中国梧桐和梓木木屑中提取纤维素。结果表明，松木是最适合用 IL 提取纤维素的木材种类。在优化条件下，其纤维素提取率高达 62%，当使用 DMSO/水作为沉淀剂时，其纤维素含量高达 85%。热台偏光显微镜可清晰观察溶解过程，微波辐射可显著缩短反应时间。（13）C CP/MAS NMR、FTIR、XRD 和 SEM 用于分析松木的富含纤维素的提取物。结果表明，IL 通过破坏木质纤维素之间的分子内和分子间氢键溶解松木。提取物的主要成分是具有均匀致密结构的纤维素。提取后，AmimCl 可轻松回收和再利用。
