Hydrophobic task-specific ionic liquids: synthesis, properties and application for the capture of SO2.
Hydrophobic task-specific ionic liquids: synthesis, properties and application for the capture of SO2.
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DOI：
10.1016/j.jhazmat.2014.06.037
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发表时间：
2014-08
影响因子：
13.6
通讯作者：
Shidong Tian;Yucui Hou;Weize Wu;Shuhang Ren;Jianguo Qian
中科院分区：
文献类型：
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作者：
Shidong Tian;Yucui Hou;Weize Wu;Shuhang Ren;Jianguo Qian
离子液体(ILS)对SO2的捕获已引起世界各国的广泛关注。但ILS不仅能吸收SO2，还能吸收烟气中的水分。从ILS中去除水分是重复使用吸收剂所必需的。为了降低除水的能源成本，弱化离子液体与水之间的相互作用将是有益的。本工作设计并合成了两种疏水功能化ILS：1-(2-二乙氨基乙基)-3-甲基咪唑六氟磷酸盐([Et2NEmim][Pf6])和1-(2-diethyl-aminoethyl)-1-methylpyrrolidinium六氟磷酸盐([Et2NEmpyr][Pf6])。研究了离子液体的热稳定性和物理性能。在此基础上，系统地研究了离子液体在SO2吸收中的应用及其吸收机理。结果表明，两种离子液体均不溶于水，[Et2NEmim][PF6]比[Et2NEmpyr][PF6]具有更低的粘度、更高的热稳定性和更高的SO2吸收速率。[Et2NEmim][PF6][Et2NEmim][PF6]在30℃水合条件下对SO2的吸收容量高达2.11摩尔SO2/摩尔IL(纯SO2)和0.94摩尔SO2/摩尔IL(3%SO2)，表明[Et2NEmim][PF6]是一种很有前途的可回收吸收SO2的吸收剂。
The capture of SO2by ionic liquids (ILs) has drawn much attention all over the world. However, ILs can absorb not only SO2but also water from flue gas. The removal of water from ILs is necessary for reusing the absorbent. In order to reduce the energy costs of removing water, it would be helpful to weaken the interactions between ILs and water. In this work, two kinds of hydrophobic task-specific ILs, 1-(2-diethyl-aminoethyl)-3-methylimidazolium hexafluorophosphate ([Et2NEmim] [PF6]) and 1-(2-diethyl-aminoethyl)-1-methylpyrrolidinium hexafluorophosphate ([Et2NEmpyr][PF6]), were designed and synthesized. Thermal stability and physical properties of the ILs were studied. Furthermore, the application of the ILs for the capture of SO2and the absorption mechanism were systematically investigated. It has been found that both of the ILs are immiscible with water, and [Et2NEmim][PF6] has much lower viscosity, much higher thermal stability and much higher SO2absorption rate than [Et2NEmpyr][PF6]. [Et2NEmim][PF6] shows high SO2absorption capacities up to 2.11 mol SO2per mole IL (pure SO2) and 0.94 mol SO2per mole IL (3% SO2) under hydrous conditions at 30 °C. The result suggests that [Et2NEmim][PF6] is a promising recyclable absorbent for the capture of SO2.