Abstract:

The development of high efficient, economic and green SO₂ absorbers not only has a strong academic value, but also has a good application prospect. Herein, a series of ether-containing anion-functionalized ionic liquids were designed and prepared. The effect of ether on SO₂ absorption was investigated. The results indicated that SO₂ capacity increased significantly when ether was introduced on the anion. Furthermore, absorption capacity of SO₂ did not decrease obviously when the cation with a smaller molar mass tributyl ethyl phosphorus [P₄₄₄₂] was used. The effective absorption capacity of [P₄₄₄₂][2-CH₃OPhCOO] was 3.32 mol SO₂ per 1 mol IL at 20℃ and 10⁵ Pa, with the effective mass absorption of 0.56 g SO₂ per 1 g IL. The cycles of six absorption and desorption showed that SO₂ capture by [P₄₄₄₂][2-CH₃OPhCOO] was efficient and reversible. The method introducing ether to improve gas capture may be useful for other fields such as separation, catalyst and so on.

Key words: SO₂, methoxyl group, functional, ionic liquids, gas capture

摘要：

发展高效、经济、绿色的SO₂吸收剂不但具有较强的学术价值，而且有良好的应用前景。设计并制备了一系列含醚的阴离子功能化离子液体，系统地研究了阴离子上引入醚基团对离子液体SO₂吸收容量的影响。结果表明，在阴离子的苯环上引入甲氧基，对离子液体的吸收容量有明显提升。当阳离子为摩尔质量更小的三丁基乙基磷[P₄₄₄₂]时，所得离子液体的吸收容量没有明显下降，20℃、10⁵ Pa SO₂下，[P₄₄₄₂][2-CH₃OPhCOO]有效吸收量为每摩尔离子液体吸收3.32 mol SO₂，有效质量吸收量是每克离子液体吸收0.56 g SO₂。六次吸收解吸循环，表明[P₄₄₄₂][2-CH₃OPhCOO]可以高效可逆地捕集SO₂。基于含醚阴离子功能化离子液体的加强效应进行气体捕集的方法，可进一步应用于分离、催化等领域。

关键词: SO₂, 甲氧基, 功能化, 离子液体, 气体捕集