离子液体[BMIM]OH对SO<sub>2</sub>的吸收性能

摘要为了开发可以循环利用、绿色化的环境友好型脱硫剂，以离子液体[BMIM]OH为吸收剂，研究了其对气体SO₂的溶解性能，考察了温度对吸收过程、解吸过程的影响，以及纯离子液体和负载硅胶后的离子液体的循环吸收能力。研究结果表明，在0.1 MPa，25℃时的平衡吸收量达每1 mol ILs吸收1.84 mol SO₂，溶解量随温度的升高而减少。吸收后的[BMIM]OH可以通过加热的方式进行解吸，6次循环实验的平均解吸率达到了99.3%，平均每1 mol的离子液体能够解吸出1.47 mol SO₂。采用硅胶负载后的离子液体仍表现出良好的循环吸收和解吸能力，4次循环的平均解吸率为96.6%。[BMIM]OH有望应用于工业过程中SO₂的分离与回收。

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	梁昌娟
	李红海

关键词： [BMIM]OH 气体吸收 SO₂ 离子液体负载

Abstract： To explore environmentally benign desulfurizer that was recyclable and greener, the solubility of SO₂ in 1-butyl-3-methylimidazolium hydroxide ([BMIM]OH), the effect of temperature on the absorption and desorption and the recyclability for the pure and supported ionic liquid had been studied. It was found that the equilibrium absorption amount of SO₂ could be up to 1.84 mols per mole of ionic liquid at 25℃ and 0.1 MPa. The dissolved amount of SO₂ in[BMIM]OH decreased as temperature increased, and the absorbed SO₂ could be desorbed by means of heating. The average desorption rate could achieve 99.3% and an average 1.47 mols of SO₂ could be separated per mole of ionic liquid for a 6 cycles' operation. The ionic liquid supported on porous silica gel showed good absorption and desorption capacity, and the average desorption rates could reach 96.6% for 4 cycles' operation. It is hopeful for[BMIM]OH to be applied in separation and recovery of SO₂ gas in industrial process.

Keywords： 1-butyl-3-methylimidazolium hydroxide([BMIM]OH)； gas absorption； sulfur dioxide； supported ionic liquid

Received 2018-04-23;

Corresponding Authors: 李红海,E-mail:lihonghai@qust.edu.cn。 Email: lihonghai@qust.edu.cn

About author: 梁昌娟(1984-),女,硕士研究生,现从事分析认证与研发工作。

引用本文:

梁昌娟, 李红海.离子液体[BMIM]OH对SO₂的吸收性能[J]. 化学工业与工程, 2019,36(4): 18-22

Liang Changjuan, Li Honghai.Absorption of SO₂ by Ionic Liquid[BMIM]OH[J]. Chemcial Industry and Engineering, 2019,36(4): 18-22

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