Dicarboxylic acid salts as task-specific ionic liquids for reversible absorption of SO2 with a low enthalpy change
Dicarboxylic acid salts as task-specific ionic liquids for reversible absorption of SO2 with a low enthalpy change
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二羧酸盐作为特定任务的离子液体，用于低焓变可逆吸收 SO2
DOI：
10.1039/c3ra42256a
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发表时间：
2013-01-01
期刊：
影响因子：
3.9
通讯作者：
Zhang, Zhi-Bing
中科院分区：
文献类型：
--
作者：
Huang, Kuan;Wang, Guan-Nan;Zhang, Zhi-Bing
合成了六种酸性盐离子液体（ASIL），即三乙基丁基二羧酸铵，作为绿色材料用于SO2的捕集。实验结果表明，ASIL具有可逆化学捕集SO2的能力，在15.5 kPa时，其捕集容量为0.112 ~ 0.232（质量比），在100 kPa和40 °C时，其捕集容量为0.374 ~ 0.456（质量比）。有趣的是，发现这些ASIL中的两种具有低粘度，使得SO2能够快速传质。基于FTIR光谱和密度泛函理论的结构计算，提出了一种反应机理来解释化学吸收。热力学分析表明，SO2与ASIL反应的焓较低（[N2224][dimaleate]和[N2224][dimalonate]分别为-29.9和-42.2 kJ mol−1）。此外，ASIL具有较高的热稳定性，这有利于其在烟气脱硫中的潜在应用。
Six acid salt ionic liquids (ASILs), triethylbutylammonium dicarboxylates, have been synthesized to act as green materials for SO2 capture. The experimental results reveal that the ASILs can trap SO2 reversibly and chemically with a large capacity of 0.112 up to 0.232 (mass ratio) at 15.5 kPa and of 0.374 to 0.456 (mass ratio) at 100 kPa and 40 °C. Two of these ASILs are interestingly found to have a low viscosity that enables the fast mass transfer of SO2. A reaction mechanism is proposed to explain the chemical absorption based on FTIR spectra and structural calculations using the density functional theory. Thermodynamic analysis indicates the enthalpy of the reaction of SO2 with the ASILs is low (−29.9 and −42.2 kJ mol−1 for [N2224][dimaleate] and [N2224][dimalonate], respectively). Additionally, the ASILs have a high thermal stability, which favors their potential application in flue gas desulfurization.