Highly Efficient and Reversible Absorption of SO2 by Aqueous Triethylenetetramine Tetralactate Solutions

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• 作者：Jianguo Qian ; Shuhang Ren ; Shidong Tian ; Yucui Hou ; Chenxing Wang ; Weize Wu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：October 1, 2014
• 年：2014
• 卷：53
• 期：39
• 页码：15207-15212
• 全文大小：292K
• ISSN：1520-5045

文摘

The capture of SO₂ by ionic liquids (ILs) has drawn much attention. In this work, a series of triethylenetetramine (lactate)_n ([TETA]L_n) was synthesized and triethylenetetramine tetralactate ([TETA]L₄) was selected to prepare aqueous IL solutions to absorb SO₂. It has been found that the aqueous IL solutions can absorb large amounts of SO₂; the saturated mole ratio of SO₂ to IL in the aqueous IL solution decreases with increasing temperature, and increases with increasing water content of the aqueous IL solution; the density and viscosity of the aqueous IL solution decreases with increasing temperature and water content, and the density and viscosity of aqueous IL solution after SO₂ absorption is higher than that before SO₂ absorption. The absorption of SO₂ by the aqueous IL solution is reversible. Compared with other ILs, [TETA]L₄ has many advantages in application, including inexpensive synthetic materials, uncomplicated synthetic procedures, high SO₂ capacity, and excellent reversibility.