SO2 absorption in acid salt ionic liquids/sulfolane binary mixtures: Experimental study and thermodynamic analysis
SO2 absorption in acid salt ionic liquids/sulfolane binary mixtures: Experimental study and thermodynamic analysis
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酸式盐离子液体/环丁砜二元混合物吸收SO2：实验研究和热力学分析
DOI：
10.1016/j.cej.2013.10.050
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发表时间：
2014-02-01
影响因子：
15.1
通讯作者：
Hu, Xing-Bang
中科院分区：
文献类型：
--
作者：
Huang, Kuan;Chen, Yong-Le;Hu, Xing-Bang
合成了两种新的简单酸式盐离子液体（ASIL）：二戊二酸四乙铵（[N-2222][diglutarate]）和二戊二酸二甲基乙醇铵（[DMEA][diglutarate]），并制备了ASIL/环丁砜二元混合液，制备了ASIL/环丁砜二元混合液。SO2吸收速率被发现是相当快的平衡时间在2分钟内，由于低粘度的混合物。在0-1 bar的压力范围和303.15-333.15 K的温度范围内测量了两种二元混合物中SO2的溶解度，结果表明，在1 bar和303.15 K下，二元混合物可以捕获6.836-7.624 mol SO2/kg吸收剂。在低至0.004 bar的压力下，溶解度为0.826-0.954 mol SO2/kg吸收剂，这对于从具有低含量SO2的烟气中捕获SO2是重要的。采用反应平衡热力学模型（RETM）进行热力学分析，计算了混合物吸收SO2的亨利定律常数、反应平衡常数、化学吸收量、物理吸收量和热力学函数。两种二元混合物的吸收焓分别为-53.73和-47.15kJ/mol。ASIL/环丁砜二元混合物是一个有吸引力的替代纯离子液体应用于SO2吸收由于大的吸收容量和低的吸收焓，以及快速的吸收速率。(C)2013爱思唯尔有限公司版权所有。
Two new simple acid salt ionic liquids (ASILs), tetraethylammonium diglutarate ([N-2222][diglutarate]) and dimethylethanolammonium diglutarate ([DMEA][diglutarate]) were synthesized and the ASILs/sulfolane binary mixtures containing 40 wt% ASILs were prepared for SO2 absorption in this work. The SO2 absorption rate is found to be quite fast with an equilibrium time within 2 min, due to the low viscosity of the mixtures. The solubilities of SO2 in the two binary mixtures were measured under the pressure range of 0-1 bar and the temperature range of 303.15-333.15 K and results demonstrate the binary mixtures could trap as much as 6.836-7.624 mol SO2/kg absorbents at 1 bar and 303.15 K. The solubilities are 0.826-0.954 mol SO2/kg absorbents at a pressure as low as 0.004 bar, which is important for capturing SO2 from the flue gas with low content of SO2. Thermodynamic analysis based on a Reaction Equilibrium Thermodynamic Model (RETM) was used to calculate the Henry's law constants, reaction equilibrium constants, chemical absorption capacity, physical absorption capacity and thermodynamic functions of SO2 absorption in the mixtures. The calculated absorption enthalpy are -53.73 and -47.15 kJ/mol for the two binary mixtures, respectively. The ASILs/sulfolane binary mixtures are shown to be an attractive alternative to pure ILs to be applied in SO2 absorption due to the large absorption capacity and low absorption enthalpy, as well as the fast absorption rate. (C) 2013 Elsevier B.V. All rights reserved.