Effect of alkyl and aryl substitutions on 1,2,4-triazolium-based ionic liquids for carbon dioxide separation and capture
Effect of alkyl and aryl substitutions on 1,2,4-triazolium-based ionic liquids for carbon dioxide separation and capture
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DOI：
10.1039/c2ra22646d
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发表时间：
2013-02
期刊：
影响因子：
3.9
通讯作者：
Patrick C. Hillesheim;Joseph A. Singh;S. Mahurin;P. Fulvio;Yatsandra Oyola;Xiang Zhu;D. Jiang;S. D
中科院分区：
文献类型：
--
作者：
Patrick C. Hillesheim;Joseph A. Singh;S. Mahurin;P. Fulvio;Yatsandra Oyola;Xiang Zhu;D. Jiang;S. D
已经合成了一系列基于1,2,4 - 三唑鎓的离子液体，并对其在基于支撑离子液体膜的二氧化碳分离中的应用进行了评估。这些基于三唑鎓的化合物的性质已被证明对异构体取代敏感，例如异丙基和丙基，以及芳基衍生物化合物中的邻位和对位取代。虽然结构异构体之间的物理性质（如粘度）没有显著差异，但二氧化碳的渗透性、选择性和溶解性表现出显著变化，这使得能够开发用于分离应用的特定任务的基于三唑鎓的离子液体。还完成了COSMOtherm研究以更好地了解离子液体，结果表明含烷基的离子液体的实验值和计算值之间具有很强的相关性。因此，基于1,2,4 - 三唑鎓的液体构成了一类化合物，为研究结构变化如何影响物理化学性质提供了独特的机会，而这些性质对于不断开发在分离中具有增强吸附能力和选择性的离子液体是必要的。
A series of 1,2,4-triazolium-based ionic liquids have been synthesized and evaluated for their use in supported ionic liquid membrane based CO2 separations. The properties of these triazolium-based compounds have proven sensitive to isomeric substitutions, such as isopropyl and propyl groups, as well as ortho and para substitutions in the aryl derivative compounds. While physical properties such as viscosity did not vary significantly between structural isomers, the CO2 permeability, selectivity, and solubility exhibited significant changes allowing for development of task-specific triazolium-based ionic liquids for separation applications. COSMOtherm studies were also completed to gain a better understanding of the ionic liquids which demonstrated a strong correlation between experimental and computational values for the alkyl bearing ionic liquids. Hence, 1,2,4-triazolium-based liquids comprise a class of compounds offering unique opportunities to examine how structural changes affect the physicochemical properties which are necessary for the continuous development of ionic liquids with enhanced adsorption capacity and selectivity in separations.