Using Ionic Liquid Mixtures To Improve the SO2 Absorption Performance in Flue Gas

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• 作者：Wen Li ; Ying LiuLihong Wang ; Guanjun Gao
• 刊名：Energy & Fuels
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：31
• 期：2
• 页码：1771-1777
• 全文大小：535K
• ISSN：1520-5029

文摘

The functional ionic liquids (ILs) [NH₂emim][OAc] and [NH₂emim][BF₄] were synthesized for SO₂ capture. Although functional ILs have potential advantages in SO₂ absorption, the high viscosity of a single IL markedly affects the SO₂ absorption separation process. To improve the SO₂ absorption performance, [NH₂emim][OAc] and [NH₂emim][BF₄] were mixed with low-viscosity imidazolium-based ILs [bmim][OH]/[bmim][BF₄]. When the mole ratio of [NH₂emim][OAc]/[bmim][OH] is about 1:1, the binary mixture has the best SO₂ absorption capacity. The SO₂ absorption performance was investigated in the simulated flue gas, where SO₂ partial pressure was about 0.2 kPa. Under the low SO₂ partial pressure, the absorption capacity of the [NH₂emim][OAc] + [bmim][OH] mixture was more than 0.7 mol of SO₂/mol of IL, which was superior to that of a single IL. The regeneration test of [NH₂emim][OAc] + [bmim][OH] showed that the binary mixture had high reversibility and the SO₂ absorption capacity almost kept constant after 12 recycles. The viscosity and density of the IL mixture changed slightly, which only have a 2–3% increase in each cycle.