Selective Separation of Hydrogen Sulfide with Pyridinium-Based Ionic Liquids
Selective Separation of Hydrogen Sulfide with Pyridinium-Based Ionic Liquids
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DOI：
10.1021/acs.iecr.7b04477
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发表时间：
2018-01
影响因子：
4.2
通讯作者：
Xue Wang;Shaojuan Zeng;Junli Wang;D. Shang;Xiangping Zhang;Jindun Liu;Yatao Zhang
中科院分区：
文献类型：
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作者：
Xue Wang;Shaojuan Zeng;Junli Wang;D. Shang;Xiangping Zhang;Jindun Liu;Yatao Zhang
本工作制备了吡啶类离子液体，并利用其分子中存在的活性质子对H2S进行了选择性分离。合成并表征了一系列吡啶离子液体，系统研究了其密度、粘度、热分解温度等物理性能和H2S分离性能。结果表明，H2S和CO2在离子液体中的溶解度随压力的升高而显著增加，随温度的升高而降低，随阳离子上烷基链长度的增加而略有增加。实验结果表明，H2S在离子液体中的溶解度大小顺序为：[C8Py][SCN] > [C6Py][SCN]> [C4Py][SCN]>[C4Py][NTf 2] > [C4Py][NO 3] > [C4Py][BF 4]。实验结果还表明，H_2S在离子液体中的亨利定律常数远低于CO_2的亨利定律常数，表明离子液体对H_2S的吸附作用较强。
In this work, pyridinium-based ionic liquids (ILs) were prepared and showed excellent performance in selective separation of H2S owing to existing active proton in H2S molecule. A series of pyridinium-based ILs were synthesized and characterized, and their physical properties including density, viscosity, and thermal decomposition temperatures as well as H2S separation performances were systematically studied. The results indicated that the solubilities of H2S and CO2 in ILs increased significantly with increasing pressure and decreased with increasing temperature, while slightly increased with the growing length of the alkyl chains on the cations. On the basis of the analysis of experimental results, the molar solubility of H2S in these ILs declined following the order: [C8Py][SCN] > [C6Py][SCN] > [C4Py][SCN] > [C4Py][NTf2] > [C4Py][NO3] > [C4Py][BF4]. Further, the results revealed that the Henry’s law constants of H2S in the corresponding ILs were much lower than those of CO2, indicating that the ILs co...