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Synthesis and Characterization of Fluorinated Ionic Liquids and Their Application in Hydrofluorocarbon Gas Uptake
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2024-05-03 , DOI: 10.1021/acs.iecr.4c00370
Randinu Pulukkody 1 , Kalin R. Baca 2 , Sarah N. Lak 1 , Athena Butler-Christodoulou 3 , Mark B. Shiflett 2 , Emily B. Pentzer 1, 3
Affiliation  

This study reports the synthesis and comprehensive characterization of five fluorinated ionic liquids (FILs), each composed of an imidazolium cation of varied fluoroalkyl chain lengths paired with a fluorinated anion: a newly developed aromatic sulfonamide, bistriflimide (Tf2N), or iodide. The relationship between molecular structure and physical properties, including thermal behavior, density, and viscosity, is reported. The identity of the anion has the strongest effect on both thermal stability and thermal behavior, whereas elongation of the fluorinated alkyl chain of the cation more strongly influences density and viscosity. These observations suggest nanosegregation within the liquid and the formation of three microphases (polar, nonpolar, and fluorous). We then evaluate the solubilities of commonly used hydrofluorocarbon refrigerant gases, HFC-32 (difluoromethane) and HFC-125 (pentafluoroethane), in the neat and encapsulated FILs, comparing their performance against commercially available ionic liquids (ILs). We find higher solubilities of HFC-32 in the FILs relative to nonfluorinated commercial ILs that exhibited greater solubility of HFC-125, highlighting selective gas absorption. Additionally, we observe that encapsulated FILs exhibit trends in gas uptake analogous to those of neat FILs. This work not only contributes to a deeper understanding of the structure–property relationships in FILs but also presents promising avenues for their utilization in HFC gas uptake and separation processes, emphasizing the potential of encapsulated FILs as a viable technology to overcome challenges associated with high viscosities of ILs in bulk processing.

中文翻译:


含氟离子液体的合成、表征及其在氢氟烃气体吸收中的应用



本研究报告了五种氟化离子液体 (FIL) 的合成和综合表征,每种液体由不同氟烷基链长度的咪唑鎓阳离子与氟化阴离子配对组成:一种新开发的芳香族磺​​酰胺,双三氟甲酰亚胺 (Tf 2 N),或碘化物。报告了分子结构和物理性质(包括热行为、密度和粘度)之间的关系。阴离子的特性对热稳定性和热行为具有最强的影响,而阳离子的氟化烷基链的伸长对密度和粘度的影响更强烈。这些观察结果表明液体内存在纳米偏析以及三种微相(极性、非极性和氟)的形成。然后,我们评估了常用的氢氟碳制冷剂气体 HFC-32(二氟甲烷)和 HFC-125(五氟乙烷)在纯封装 FIL 中的溶解度,并将其性能与市售离子液体 (IL) 进行比较。我们发现 FIL 中 HFC-32 的溶解度高于非氟化商业 IL,后者对 HFC-125 的溶解度更高,突出了选择性气体吸收。此外,我们观察到封装的 FIL 表现出与纯 FIL 类似的气体吸收趋势。这项工作不仅有助于更深入地了解 FIL 的结构-性能关系,而且还为它们在 HFC 气体吸收和分离过程中的应用提供了有前景的途径,强调了封装 FIL 作为克服高粘度相关挑战的可行技术的潜力。批量处理中的 IL 数量。
更新日期:2024-05-03
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