Efficient capture of SO₂ by a binary mixture of caprolactam tetrabutyl ammonium bromide ionic liquid and water

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• 作者：Erhong  ; Duan^a ; Bin  ; Guo^a ;   ; ^{gbin69@163.com} ; Miaomiao  ; Zhang^a ; Yanan  ; Guan^a ; Hua  ; Sun^b ; Jing  ; Han^a
• 关键词：Caprolactam ; Tetrabutyl ammonium bromide ; Ionic liquids ; SO₂ ; Absorption
• 刊名：Journal of Hazardous Materials
• 出版年：2011
• 出版时间：30 October 2011
• 年：2011
• 卷：194
• 期：Complete
• 页码：48-52
• 全文大小：347 K

文摘

The solubility of SO₂ in a binary mixture of water and caprolactam tetrabutyl ammonium bromide ionic liquid (CPL-TBAB IL) was investigated. Though the ionic liquid and water were fully miscible, a phase separation occurred when SO₂ was introduced into the mixture. The SO₂ concentrated in the lower layer, and it could be released by heating the solution under reduced pressure (382.2 K, 10.1 kPa). After desorption, the mixture could be reused to absorb SO₂. It was found that SO₂ acts as a switch to cause the water and CPL-TBAB IL to phase separate, and the mechanics of this phase separation process was studied by gas chromatography¨Cmass spectrometry, fourier transform-infrared spectroscopy and Karl¨CFisher titration. The absorption and desorption of SO₂ in the CPL-TBAB/water mixtures were reversible.