离子液体[BMIM]OH对SO_2的吸收性能
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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SO_2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 SO_2,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 SO_2。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SO_2的分离与回收。
To explore environmentally benign desulfurizer that was recyclable and greener, the solubility of SO_2 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 SO_2 could be up to 1.84 mols per mole of ionic liquid at 25 ℃ and 0.1 MPa. The dissolved amount of SO_2 in [BMIM]OH decreased as temperature increased, and the absorbed SO_2 could be desorbed by means of heating. The average desorption rate could achieve 99.3% and an average 1.47 mols of SO_2 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 SO_2 gas in industrial process.
To explore environmentally benign desulfurizer that was recyclable and greener, the solubility of SO_2 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 SO_2 could be up to 1.84 mols per mole of ionic liquid at 25 ℃ and 0.1 MPa. The dissolved amount of SO_2 in [BMIM]OH decreased as temperature increased, and the absorbed SO_2 could be desorbed by means of heating. The average desorption rate could achieve 99.3% and an average 1.47 mols of SO_2 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 SO_2 gas in industrial process.
引文
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[2] Herrera C,de Carvalho Costa G,Atilhan M,et al.A theoretical study on aminoacid-based ionic liquids with acid gases and water[J].Journal of Molecular Liquids,2017,225(1):347-356
[3] 李建隆,梁昌娟,李红海.离子液体脱除SO2技术的研究进展[J].化工进展,2011,30(2):417-424Li Jianlong,Liang Changjuan,Li Honghai.Research progress of ionic liquids desulfurization technology[J].Chemical Industry and Engineering Progress,2011,30(2):417-424(in Chinese)
[4] Yuan X,Zhang S,Lu X.Hydroxyl ammonium ionic liquids:Synthesis,properties,and solubility of SO2[J].Journal of Chemical & Engineering Data,2007,52(2):596-599
[5] Yang J,Hu G,Gao H.Influence of operating parameters on performance of SO2 absorption in fulvic acid solution[J].Chemical Engineering Journal,2016,288(15):724-738
[6] Mohammadi M,Foroutan M.Molecular investigation of SO2 gas absorption by ionic liquids:Effects of anion type[J].Journal of Molecular Liquids,2014,193(5):60-68
[7] Korotkevich A,Firaha D S,Padua A A H,et al.Ab initio molecular dynamics simulations of SO2 solvation in choline chloride/glycerol deep eutectic solvent[J].Fluid Phase Equilibria,2017,448:59-68
[8] Ranu B C,Banerjee S.Ionic liquid as catalyst and reaction medium.the dramatic influence of a task-specific ionic liquid,[bmIm]OH,in michael addition of active methylene compounds to conjugated ketones,carboxylic esters,and nitriles[J].Organic Letters,2005,7(14):3 049-3 052
[9] Dong K,Zhang S,Wang D,et al.Hydrogen bonds in imidazolium ionic liquids[J].The Journal of Physical Chemistry A,2006,110(31):9 775-9 782
[10] Liu X,Zhang S,Zhou G,et al.New force field for molecular simulation of guanidinium-based ionic liquids[J].The Journal of Physical Chemistry B,2006,110(24):12 062-12 071