共查询到18条相似文献,搜索用时 296 毫秒
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离子液体作为一种新型绿色介质,受到研究学者的广泛关注。离子液体具有不易燃、无味、无污染、无蒸汽压、可循环使用等独特性质,被广泛应用于化学化工过程中。离子液体用于膜分离技术具有不易挥发、稳定性好的特点,近来对离子液体在支撑液膜方面的研究备受关注,离子液体支撑液膜在污染性气体的吸收分离方面具有高选择性、高渗透性等优势,在有机物的分离方面具有分离效果明显、耐用性强等优势,在化学反应方面具有催化效率高、可循环使用等优势,本文介绍了离子液体支撑液膜的常用制备方法和膜基材料的选择,探讨了离子液体支撑液膜的稳定性和分离选择性的影响因素,对离子液体支撑液膜在气体分离、有机物的分离、化学反应等方面的应用研究进行了综述。 相似文献
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离子液体支撑液膜在较大跨膜压差(0.25~0.3MPa)下的稳定性较差,具有较好稳定性的聚离子液体膜和离子液体-聚合物共混膜等逐渐被关注。本文综述了离子液体支撑液膜、聚离子液体膜、离子液体?聚合物共混膜等离子液体膜CO2分离性能、分离机理及稳定性的最新研究进展,介绍了无机颗粒-离子液体-聚合物共混膜的研究现状。指出离子液体膜的高CO2渗透通量与高稳定性之间的矛盾、共混膜结构调控难等问题是其工业化应用的主要障碍,提出开发新的膜材料、改进制膜工艺以减小膜厚、优化膜结构是提高膜的CO2渗透和分离性能,并保持膜稳定性的有效途径。无机颗粒-离子液体-聚合物共混膜兼有较高的CO2分离性能和较好稳定性,具有良好的应用前景,对其制备方法、结构、性能及CO2分离机理的研究将成为这一领域的热点。 相似文献
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用于芳烃/烷烃体系蒸汽渗透分离的离子液体支撑液膜研究 总被引:1,自引:1,他引:0
研究离子液体"填充型"支撑液膜制备规律,以及操作条件对苯/环己烷混合物蒸汽渗透分离过程影响。利用[C4mim][BF4]、[C8mim][BF4]、[C4mim][PF6]、[C6mim][PF6]、[4-Mebupy][BF4]、[3-Mebupy][BF4]离子液体分别制备支撑液膜,用于苯/环己烷混合物蒸汽渗透膜分离过程研究。实验比较了离子液体的种类、操作温度、原料液浓度等因素对苯/环己烷混合体系的蒸汽渗透膜分离性能的影响,其中[3-Mebupy][BF4]制得的支撑液膜对等体积配比的苯和环己烷混合物分离效果最佳,30℃时渗透通量为11.4g?m2?h?1,分离因子可达32.85。通过长时间运行的稳定性实验,证实离子液体支撑液膜的蒸汽渗透过程能够实现苯和环己烷的有效分离,具备良好的稳定性。离子液体"填充型"支撑液膜有望成为降低芳烃/烷烃等有机溶剂体系分离过程能耗的有效途径。 相似文献
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Francisco J. Hernández‐Fernández Antonia P. de los Ríos Luis J. Lozano‐Blanco Carlos Godínez 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2010,85(11):1423-1435
Ionic liquids have shown potential as green reaction media compared with organic solvents, mainly due to their lack of vapour pressure. In non‐aqueous enzymology, ionic liquids are opening up new fields. The advantages of using ionic liquids over the use of organic solvents as reaction medium for biocatalysis include enhancement of enzyme activity, stability and selectivity. In this work, the enzymatic synthesis of esters in ionic liquids has been extensively reviewed. Numerous examples of the application of ionic liquids as reaction medium for the enzymatic production of esters have been included. The effect of the nature of the ionic liquid on activity, selectivity and stability of enzymes which catalyze esters synthesis has been carefully analysed. Innovative reaction methodologies for the biosynthesis of esters, including ionic liquid/supercritical carbon dioxide biphasic systems and the integrated reaction/separation processes using supported liquid membranes based on ionic liquids have been revised. Copyright © 2010 Society of Chemical Industry 相似文献
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离子液体固载化及其应用 总被引:12,自引:0,他引:12
离子液体被认为是一类可取代传统有机溶剂的环境友好新型溶剂。离子液体的功能化可使其具有更广阔的应用空间;将功能化离子液体进行固载化,可以把离子液体和固相载体材料的优点结合在一起,应用于反应与催化时,从而更有利于产物和原料的分离、催化剂的循环使用,并且更经济。对近年来离子液体固载化的方法和应用进行了综述。 相似文献
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Ionic liquids in separations 总被引:5,自引:0,他引:5
Ionic liquids are liquids composed completely of ions. In the past two decades, ionic liquids have been widely used as "green solvents" replacing traditional organic solvents for organic synthesis and catalysis. In addition, ionic liquids are playing an increasingly important role in separation science. In this Account, the application of ionic liquids in all areas of separation science including extractions, gas chromatography, and supported liquid membrane processes are highlighted. 相似文献
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由于离子液体对CO2具有较好的溶解选择性,离子液体支撑液膜分离CO2越来越受到关注。比较了含3种不同阴离子的常规离子液体([bmim][BF4]、[bmim][PF6]、[bmim][Tf2N])作为支撑液膜的液膜相分离CO2/CH4的性能,考察了咪唑环上烷基链长对离子液体支撑液膜性能的影响。考虑向离子液体中引入胺基和羧基等亲CO2基团,制备了1-丁基-3-甲基咪唑丙氨酸离子液体([bmim][β-Ala]),考察了 [bmim][β-Ala]支撑液膜分离CO2/CH4的性能,并对在CO2渗透测试前后的支撑液膜进行了FT-IR分析,发现氨基酸离子液体中的-NH2和CO2的较强作用以及该离子液体的高黏性影响了CO2的透过性,使[Bmim][β-Ala]支撑液膜的CO2透过率低。 相似文献
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Selective Separation of Toluene/n‐Heptane by Supported Ionic Liquid Membranes with [Bmim][BF4] 下载免费PDF全文
Room‐temperature ionic liquids serve as alternative solvents for volatile organic compounds in liquid‐liquid extraction and liquid membrane separation. 1‐Butyl‐3‐methylimidazolium tetrafluoroborate ([Bmim][BF4]) was applied for extraction and supported ionic liquid membranes (SILMs) to separate toluene and n‐heptane. A high separation factor of toluene was achieved due to the strong interaction between ionic liquid cations and toluene. The mass transfer performance of the SILM process was enhanced by higher operating temperature. With the increase of initial toluene concentration in the feed phase, the mass transfer flux and removal efficiency of the SILM process were improved, while the separation factor decreased. The mass transfer flux was growing with the increase of flow rate at both sides. The SILM process was stable over a long time period due to the high viscosity and low volatility of [Bmim][BF4]. 相似文献
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Anders Riisagera Rasmus Fehrmanna Marco Haumannb Peter Wasserscheidb 《Topics in Catalysis》2006,40(1-4):91-102
The latest developments in supported ionic liquid phase (SILP) systems for catalysis and separation technology are surveyed.
The SILP concept combines the advantages of homogeneous catalysis with heterogeneous process technology, and a variety of
reactions have been studied where supported ionic liquid catalysts proved to be more active and selective than common systems.
In separation applications the use of supported ionic liquids can facilitate selective transport of substrates across membranes. 相似文献
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离子液体-中空纤维支撑液膜技术分离Cs/Mo研究 总被引:1,自引:0,他引:1
支撑液膜(SLM)发展迅速、应用前景广阔,在众多支撑液膜性能改进的研究中,采用离子液体(IL)代替传统有机溶剂,已在气体、有机物分离以及生物反应器方面有一定的进展。本实验采用疏水性聚丙烯中空纤维(HF)作支撑体,针对目标金属Cs离子选择杯冠化合物DB18C6作萃取剂,预选[Bmim][PR]、[Bmim][NTf2]和[Bmim][BF4]三种ILs作稀释剂制备膜体系,探索其在Cs/Mo分离中的应用潜力。结果表明,在本实验工艺条件下,使用[Bmim][PF6]成功制备了离子液体中空纤维支撑液膜体系(IL—HFSLM),该液膜体系在料液流速低于5mL/min的条件下稳定存在,并可实现从含Mo溶液中回收超过80%的Cs。 相似文献
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《分离科学与技术》2012,47(2):354-359
Optically pure lactic acid that can be prepared by fermentation is one of the important raw materials for biodegradable polymer. Since an economical technique is desired that separates lactic acid from the fermentation broth, we proposed lactate permeation through a poly(vinyl chloride)(PVC)-based membrane containing ionic liquids as a carrier. Lactate was successfully permeated through polymer inclusion membranes (PIMs) containing Aliquat 336, Cyphos IL -101, and -102 as ionic liquids. From the viewpoints of permeation rates and the pH drop of the feed phase, Aliquat 336 was the best ionic liquid. Based on the experimental results, we calculated the overall mass transfer coefficients and evaluated the contribution of membrane resistance to the overall permeation resistance. Furthermore, permeation behavior was explained by the solution-diffusion model. The superior stability of PIMs over the supported ionic liquid membranes was observed for membranes containing Aliquat 336 as a carrier. The PVC-based membrane process containing Aliquat 336 was found to be promising for lactate separation on an industrial scale. 相似文献