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室温离子液体在分离科学研究中的新进展 总被引:4,自引:0,他引:4
室温离子液体作为一种重要的绿色溶剂,由于在金属离子、小分子有机物的萃取分离,气体吸附分离以及作为液相和气相色谱固定相等许多分离过程中体现出高分离效率和高选择性的特点,正在成为分离科学研究的前沿领域.着重总结了从2003—2006年的室温离子液体在分离科学领域中的新进展,并对其应用领域和发展前景做了展望.提出进一步加强离子液体的功能化和固定化技术及其在分离科学中的应用基础研究,探索离子液体有效的回收和再循环利用的新方法,是离子液体今后在分离科学研究中的一系列重要内容. 相似文献
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作为世界上最丰富的生物质资源,木质纤维素是生产清洁能源和精细化工品的天然原料。室温离子液体是近年来出现的一类绿色材料,对溶解和分离木质纤维素具有广阔的应用前景。本文在介绍木质素、纤维素、半纤维素和相关室温离子液体的组成与结构的基础上,综述了室温离子液体在溶解、分离木质纤维素方面的研究进展。根据目前所报道的研究结果,总结了不同离子液体对木质素、纤维素、半纤维素的溶解作用以及对木质纤维素的分离性能,分析了离子液体的结构与其溶解性能的关系,讨论了可能的溶解机理。最后提出了这一领域存在的问题,并对其未来的发展作了展望。 相似文献
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介绍了室温离子液体在烯类单体自由基聚合反应中的主要应用,结合国内外研究现状和作者实际工作中的体会,提出了对今后发展趋势的看法。 相似文献
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室温离子液体作为21世纪的新型溶剂,近几年在分析领域应用广泛.本文重点综述了离子液体在气相色谱、液相色谱、毛细管电泳及薄层色谱等方面的应用进展,并对其在色谱分离中的研究进行了展望. 相似文献
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We report on the abrasive stripping voltammetry (AbrSV) of six different solid compounds of widely different natures in room temperature ionic liquids (RTILs). Copper as a metal representative, Prussian blue as a typical inorganic complex, indigo as an organic dye model, and anthracene, pyrene, and 9,10‐diphenylanthracene as the typical representatives of aromatic hydrocarbons were chosen in this study. They were immobilized on a gold electrode surface by mechanical abrasion and their subsequent voltammetric measurements were carried out in the ionic liquid [C4mim][NTf2], 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide. The present work demonstrates that RTILs provide an excellent electrochemical solvent environment for abrasive stripping voltammetric analysis; in particular, the much wider potential windows in RTILs as compared to aqueous media greatly enhance the analytical applicability of the AbrSV technique. 相似文献
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Photoexcitation of (neat) room temperature ionic liquids (RTILs) leads to the observation of transient species that are reminiscent of the composition of the RTILs themselves. In this minireview, we summarize state-of-the-art in the understanding of the underlying elementary processes. By varying the anion or cation, one aim is to generally predict radiation-induced chemistry and physics of RTILs. One major task is to address the fate of excess electrons (and holes) after photoexcitation, which implies an overview of various formation mechanisms considering structural and dynamical aspects. Therefore, transient studies on time scales from femtoseconds to microseconds can greatly help to elucidate the most relevant steps after photoexcitation. Sometimes, radiation may eventually result in destruction of the RTILs making photostability another important issue to be discussed. Finally, characteristic heterogeneities can be associated with specific physicochemical properties. Influencing these properties by adding conventional solvents, like water, can open a wide field of application, which is briefly summarized. 相似文献
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室温离子液体反应介质中叔丁醇氢酯基化反应的研究 总被引:12,自引:0,他引:12
反应温度为100~140 ℃,CO初始压力为2~6 MPa条件下,研究了室温离子液 体与过渡金属三苯基膦配合物构成的催化反应体系中,叔丁醇与乙醇的氢酯基化反 应。同有机溶剂作为反应介质相比,室温离子液体中具有更好的催化活性,并且叔 丁醇可经羰化反应直接生成特戊酸乙酯,产物与催化体系不溶,可以容易地实现分 离。详细考察了金属配合物、离子液体、温度、压力与时间的不同对反应的影响。 相似文献
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Substitution Reactions by Azide and Thiocyanide Anions in Room Temperature Ionic Liquids 总被引:1,自引:0,他引:1
Conducted in the ionic liquids,activated and inactivated halides,acyl chlorides,tosylate and bezotriazolyl acylates were converted to corresponding azide and thiocyanide compounds in high yields under mild conditions. 相似文献
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The detection of H2S was studied using several mediators in room temperature ionic liquids (RTILs) at a microelectrode. Each mediator was characterised voltammetrically, and H2S was added to observe if any mediation took place. A successful mediator was 3,5‐tert‐butyl‐obenzoquinone. Cyclic voltammetry was carried out in [C2mim][NTf2]. A reductive wave was observed and attributed to the two‐electron reduction of the mediator. No oxidative signal was observed. H2S was flowed through the system. Cyclic voltammograms showed a decrease in the reductive wave of the mediator and the onset of an oxidative signal due to the reaction between the mediator and H2S to form an adduct. This reaction is reversible and on purging the system with N2, the original reductive signal of the mediator was recovered. 相似文献