Novel Ether-Functionalized Pyridinium Chloride Ionic Liquids for Efficient SO2 Capture

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• 作者：Jian Wang ; Shaojuan Zeng ; Lu Bai ; Hongshuai Gao ; Xiangping Zhang ; Suojiang Zhang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：October 29, 2014
• 年：2014
• 卷：53
• 期：43
• 页码：16832-16839
• 全文大小：324K
• ISSN：1520-5045

文摘

Sulfur dioxide (SO₂) emitted from the combustion of fossil flues is a major atmospheric pollutant that seriously threatens the environment and human health. The traditional methods for the removal and recovery of SO₂ are irreversible and can result in secondary pollution or suffer from solvent loss. Therefore, it is urgent to explore new absorbents for the reversible, efficient, and environment-friendly capture of SO₂. Ionic liquids (ILs) exhibit excellent performance for SO₂ capture because of their unique physicochemical properties. To improve the absorption capacities of ILs for SO₂, a series of novel ether-functionalized pyridinium chloride ILs ([E_nPy]Cl, n = 2鈥?) were designed and synthesized. The physiochemical properties of these ILs and their SO₂ absorption performance under different conditions were investigated. In addition, the SO₂/CO₂ selectivities and reusabilities of the ILs and the absorption mechanism between SO₂ and [E_nPy]Cl (n = 2鈥?) were studied. It was found that 1-[2-(2-methoxyethoxy)ethyl] pyridinium chloride showed a relatively high absorption capacity of up to 1.155 (g of SO₂)路(g of IL)^鈭? at 20 掳C and 0.1 MPa. The SO₂ absorption capacities of the studied ILs remained steady in absorption鈥揹esorption cycles, implying that [E_nPy]Cl (n = 2鈥?) could be promising candidates for SO₂ capture.