Recently, the selective removal of H₂S and CO₂ has been highly desired in natural gas sweetening. Herein, four novel azole‐based protic ionic liquids (PILs) were designed and prepared through one‐step neutralization reaction. The solubility of H₂S (0–1.0 bar), CO₂ (0–1.0 bar), and CH₄ (0–5.0 bar) was systematically measured at temperatures from 298.2 to 333.2 K. NMR and theoretical calculation were used to investigate the reaction mechanism between these PILs and H₂S. Reaction equilibrium thermodynamic model (RETM) was screened to correlate the H₂S solubility. Impressively, 1,5‐diazabicyclo[4,3,0] non‐5‐ene 1,2,4‐1H‐imidazolide ([DBNH][1,2,4‐triaz]) shows the highest H₂S solubility (1.4 mol/mol or 7.3 mol/kg at 298.2 K and 1.0 bar) and superior H₂S/CH₄ (831) and CO₂/CH₄ (199) selectivities compared with literature results. Considering the excellent absorption capacity of H₂S, high H₂S/CH₄, and CO₂/CH₄ selectivity, acceptable reversibility, as well as facile preparation process, it is believed that azole‐based PILs provide an attractive alternative in natural gas upgrading process.

中文翻译：

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新型基于唑的质子离子液体对CH4中H2S和CO2的高选择性吸收分离

近来，在天然气脱硫中非常需要选择性除去H ₂ S和CO ₂。本文通过一步中和反应设计并制备了四种新型的基于吡咯的质子离子液体（PIL）。在298.2至333.2 K的温度范围内系统地测量了H ₂ S（0–1.0 bar），CO ₂（0–1.0 bar）和CH ₄（0–5.0 bar）的溶解度。使用NMR和理论计算来研究这些PIL与H ₂ S之间的反应机理。通过筛选反应平衡热力学模型（RETM）使H ₂相关S的溶解度。令人印象深刻的是，1,5-二氮杂双环[4,3,0]非5-烯1,2,4-1H-咪唑啉（[DBNH] [1,2,4-triaz]）显示出最高的H ₂ S溶解度（与文献结果相比，在298.2 K和1.0 bar下为1.4 mol / mol或7.3 mol / kg）和更高的H ₂ S / CH ₄（831）和CO ₂ / CH ₄（199）选择性。考虑到H ₂ S的出色吸收能力，高H ₂ S / CH ₄和CO ₂ / CH _4的选择性，可接受的可逆性以及简便的制备方法，据信唑基PIL在天然产物中提供了有吸引力的替代方法。天然气升级过程。