Sulfur dioxide absorption by PEG-based functionalized ionic liquids

doi:10.11949/j.issn.0438-1157.20141935

Abstract

Abstract:

A series of PEG-based imidazolium toluenesulfonates (PEG-based functionalized ionic liquids) with long ether chain were synthesized and their ability to reversibly absorb gaseous sulfur dioxide was investigated. Physical properties (densities, surface tensions and viscosities) of the ILs had been measured during absorption process. All the ILs showed good absorption and regeneration capacity. The absorption capacity of ILs increased with increasing length of ether chain on the cation. The absorption capacity achieved more than 5.51 mole SO₂ per mole IL at 20℃, and the absorbed SO₂ gas can be readily and completely desorbed from the ILs at 80℃. The new ILs could absorb SO₂ by physical interactions at the experimental conditions under ¹H NMR and Raman spectrum investigation. Densities of the ILs increased when the ILs absorbed SO₂ and turned to be saturated, at same time, surface tensions decreased and viscosities lowered sharply.

Key words: ionic liquid, SO₂, absorption, desorption, cyclic utilization, physical property

摘要：

合成一系列含有长醚链的PEG基咪唑对甲苯磺酸盐(PEG基功能化离子液体), 检测其脱硫与再生性能, 并测定其脱硫过程中物性(密度、黏度和表面张力)变化。结果表明, PEG基功能化离子液体具有良好的脱硫与再生性能, 而且该离子液体的脱硫性能随醚链增长而增强, 20℃时SO₂与离子液体摩尔比达到5.51以上, 吸收的SO₂在80℃条件下可彻底解吸。由¹H NMR图谱和Raman光谱分析结果表明, PEG基咪唑功能化离子液体对SO₂的吸收为物理吸收。脱硫后的PEG基功能化离子液体密度增大, 表面张力减小, 黏度较脱硫之前显著降低。

关键词: 离子液体, SO₂, 吸收, 解吸, 循环利用, 物性

CLC Number:

O647.32

CHEN Ying, WANG Jianying, LIU Chao, JIANG Haichao, LIU Yumin, HU Yongqi. Sulfur dioxide absorption by PEG-based functionalized ionic liquids[J]. CIESC Journal, 2015, 66(S1): 332-337.

陈莹, 王建英, 刘超, 姜海超, 刘玉敏, 胡永琪. PEG基功能化离子液体的脱硫性能[J]. 化工学报, 2015, 66(S1): 332-337.

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