Sazanova Tatyana S, Akhmetshina Alsu I, Petukhov Anton N, Vorotyntsev Andrey V, Suvorov Sergey S, Barysheva Alexandra V, Mechergui Amal, Nyuchev Alexander V, Kazarina Olga V, Stepakova Anna N, Atlaskina Maria E, Atlaskin Artem A, Kryuchkov Sergey S, Vorotyntsev Ilya V
Laboratory of SMART Polymeric Materials and Technologies, Mendeleev University of Chemical Technology, 9 Miusskaya Sq., 125047 Moscow, Russia.
Department of Technologies for the Processing of Polymers and Composite Materials, Kazan National Research Technological University, 68 Karl Marx Str., 420015 Kazan, Russia.
Membranes (Basel). 2023 Feb 16;13(2):238. doi: 10.3390/membranes13020238.
Herein, we report for the first time a study dedicated to acidic gases' solubility in ionic liquids with sterically hindered bulky anion, namely bis(2-ethylhexyl) sulfosuccinate ([doc]), experimentally evaluated at low pressures. The effect of cation change (imidazolium, pyridinium, and pyrrolidinium) on the thermophysical properties and sorption capacities was also discussed. The densities and the activation energies of the tested ILs exhibited minor differences. Furthermore, the COSMO-RS model was used to predict the free volumes of ILs aiming to investigate its influence on gas solubilities. The conducted calculations have revealed an antibate correlation between the fractional free volume (FFV) and Henry's law constant. In particular, the lowest FFV in 1-methylimidazolium [doc] corresponded to the minimal sorption and vice versa. In addition, it was shown that the presence of protic cation results in a significant reduction in CO and HS solubilities. In general, the solubility measurement results of the synthesized ILs have shown their superiority compared to fluorinated ILs based on the physical absorption mechanism.
在此，我们首次报告了一项专门针对酸性气体在具有空间位阻大体积阴离子（即双（2-乙基己基）磺基琥珀酸盐[doc]）的离子液体中的溶解度的研究，该研究在低压下进行了实验评估。还讨论了阳离子变化（咪唑鎓、吡啶鎓和吡咯烷鎓）对热物理性质和吸附容量的影响。测试的离子液体的密度和活化能显示出微小差异。此外，使用COSMO-RS模型预测离子液体的自由体积，旨在研究其对气体溶解度的影响。进行的计算揭示了分数自由体积（FFV）与亨利定律常数之间的反相关关系。特别是，1-甲基咪唑鎓[doc]中最低的FFV对应于最小的吸附，反之亦然。此外，结果表明质子化阳离子的存在会导致CO和HS溶解度显著降低。总体而言，基于物理吸收机制，合成离子液体的溶解度测量结果显示出它们相对于氟化离子液体的优越性。
