共查询到18条相似文献,搜索用时 93 毫秒
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随着离子液体基础研究的稳步发展,离子液体在化工领域中的应用近年来得到了广泛关注。离子液体以其高效,清洁生产等诸多优点正在取代传统溶剂。文章对离子液体体系近年来在苹取分离领域的应用进行了分析综述。 相似文献
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稀土元素萃取分离是获得高纯单一稀土的关键步骤之一,开发对稀土元素具有高效分离能力的新材料和新过程是全球科技工作者研究的热点。离子液体作为一类代表性的新材料,因具有不挥发、不易燃、稳定性好、结构性质可调等独特的物理化学性质,近年来在稀土元素萃取分离领域的应用受到广泛关注。在稀土元素萃取分离过程中,离子液体不仅可用作萃取剂,也可作为稀释剂、协萃剂或同时作为萃取剂和稀释剂。系统评述了离子液体在稀土元素萃取分离中的研究进展,对非功能化离子液体和功能化离子液体在稀土元素萃取分离中的萃取行为和萃取机理进行了分析。同时,对该领域的发展所面临的主要问题和进一步的研究工作进行了探讨。 相似文献
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离子液体独特的物理化学性质和绿色安全环保的特性,使其成为当代化学的研究热点之一。本文简单介绍了离子液体在金属、碱土金属、稀土金属和放射性金属萃取方面的应用。并阐述了离子液体的广阔发展前景。 相似文献
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离子液体在膜分离过程中的应用研究进展 总被引:1,自引:0,他引:1
介绍了离子液体(ionic liquids)是由有机阳离子和有机或无机阴离子构成的、在室温或室温附近温度下呈液体状态的盐类,是新兴的可替代挥发性有机化合物的绿色溶剂。阐述了离子液体具有熔点低、不易燃、低挥发性(蒸气压接近于零)、高导电能力、电化学窗口宽、可调节性强等独特性质;在二氧化碳、二氧化硫等酸性气体以及苯、环己烷等有机溶剂分离过程中有广泛应用前景。同时,介绍了含有双键等可聚合基团的一类离子液体-聚离子液体[poly(ionic liquid)s,PILs]在二氧化碳吸收方面有特殊表现,指出聚离子液体与聚偏氟乙烯(PVDF)共混得到的薄膜材料具有高稳定性、高机械强度以及高电导率,对于缓解能源匮乏以及环境污染等具有重大意义。 相似文献
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《分离科学与技术》2012,47(4):828-841
Abstract The separation of two noble organometallic catalysts from a homogeneous organic phase was investigated using liquid phase extraction with functionalized ionic liquids. Thirteen functionalized ionic liquids containing amino, hydroxy, thioether, carboxylic, or olefin functional groups were prepared by a standard neutralization method. The extractions of Jacobsen's catalyst and Wilkinson's catalyst were conducted using the functionalized ionic liquids as the extraction phase without adding any other metal complexing extractant. The distribution factors between the ionic liquid (IL) phase and toluene (organic solution phase) demonstrated that the functional groups in ILs exhibited moderate to high affinity with the metal complexes. The influence of the ionic liquid structure on the distribution factors was also investigated. 相似文献
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咪唑类离子液体性质、制备及应用的研究进展 总被引:1,自引:0,他引:1
简介了离子液体的种类、性质,重点阐述了咪唑类离子液体的制备及其应用,通过对离子液体进行阴阳离子的设计得到功能化离子液体,主要将其作为绿色溶剂应用于有机合成反应、催化反应和萃取分离过程。 相似文献
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《分离科学与技术》2012,47(7):1172-1177
In this work, ionic liquids/water distribution ratios (D) of azo dyes, including 1-(phenylazo)-2-naphthol, 1-(2-pyridylazo)-2-naphthol, 4-(nitrophenylazo)resorcinol, 4-(2-pyridylazo) resorcinol, and 2-(4-dimethylaminophenylazo) benzoic acid, have been determined experimentally. It was found that the D values are highly influenced by the pH of the water phase and the type of salts added. They increase with increasing alkyl chain length on the cations of the ionic liquids, and the anionic effect follows the order [BF4]? > [PF6]?. Possible extraction mechanism and selective separation of some azo dyes are also investigated. The results suggest that ionic liquids have potential applications in the removal and selective separation of azo dyes from water. 相似文献
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D. R. Raut 《分离科学与技术》2015,50(3):380-386
The extraction of UO22+ ion was studied using six different solvent systems containing 2-thenoyltrifluoroacetone (HTTA) in room temperature ionic liquids such as [Cnmim][X] (where, n = 4, 6, or 8 and X? = PF6? or NTf2?) from low to moderate pH solutions for the first time. The extraction kinetics studies indicated rather slow attainment of equilibrium which in some cases improved if the solutions were pre-equilibrated with the aqueous phase prior to the actual experiments. The DU values were found to increase with increasing pH and leading to a plateau like profile at higher pH values. The D values were quite high as compared to that obtained with molecular diluents. The nature of the extracted species was ascertained by slope analysis method which suggested species of the type: UO2(TTA)+IL, UO2(TTA)2,IL, and UO2(TTA)2(HTTA)IL in different ionic liquid based solvents. Temperature variation studies on UO22+ ion extraction were also carried out and the thermodynamic parameters were calculated which indicated high endothermicity of the reactions with large positive entropy values. 相似文献