The SO₂ absorption capacities of two ionic liquid mixtures formed by 1-ethyl-3-methylimidazolium chloride ([Emim][Cl]) and 1-ethyl-3-methylimidazolium thiocyanate ([Emim][SCN]) were studied. The ionic liquid mixtures with different molar ratios of [Emim][Cl] and [Emim][SCN] (1:1 and 1:2) can be easily synthesized. The SO₂ solubility in the two mixtures was investigated under different conditions. The results demonstrated that these mixtures were efficient for SO₂ absorption. [Emim][Cl]–[Emim][SCN](1:1) captured 0.50 g/g solvent at 20 °C and 0.10 atm. Under the low SO₂ partial pressure (1960 ppm), the [Emim][Cl]–[Emim][SCN](1:1) could capture 0.11 g/g solvent. The high SO₂ absorption capacity is mainly due to the strong charge-transfer interaction of the sulfur atom of SO₂ with the anions ([Cl]⁻ and [SCN]⁻). Moreover, the solvent [Emim][Cl]–[Emim][SCN](1:1) can be reused.

中文翻译：

---

[Emim] [Cl] – [Emim] [SCN]离子液体混合物对SO ₂的有效吸收

研究了由1-乙基-3-甲基咪唑鎓氯化物（[Emim] [Cl]）和1-乙基-3-甲基咪唑鎓硫氰酸盐（[Emim] [SCN]）形成的两种离子液体混合物的SO ₂吸收能力。可以容易地合成具有不同摩尔比的[Emim] [Cl]和[Emim] [SCN]（1：1和1：2）的离子液体混合物。在不同条件下研究了SO ₂在两种混合物中的溶解度。结果表明这些混合物对于SO ₂吸收是有效的。[Emim] [Cl] – [Emim] [SCN]（1：1）在20°C和0.10 atm时捕获0.50 g / g溶剂。在低的SO ₂分压（1960 ppm）下，[Emim] [Cl]-[Emim] [SCN]（1：1）可以捕获0.11 g / g溶剂。高SO ₂吸收能力主要是由于SO ₂的硫原子与阴离子（[Cl] ^-和[SCN] ^-）具有很强的电荷转移相互作用。此外，溶剂[Emim] [Cl]-[Emim] [SCN]（1：1）可以重复使用。