Ternary System of Fe-based Ionic Liquid, Ethanol and Water for Wet Flue Gas Desulfurization

• Published in: Chinese journal of chemical engineering 2012-02, Vol.20 (1), p.140-145
• Main Author: 解美莹 李沛沛 郭惠锋 高丽霞 余江
• Format: Article
• Language: English
• Subjects: Desulfurizing; Ethanol; Ethyl alcohol; Fe-based ionic liquid; Flues; Ionic liquids; Iron; sulfide dioxide; Sulfuric acid; ternary phase diagram; wet flue gas desulfurization; 三元体系; 三氯化铁; 乙醇; 水系统; 湿法烟气脱硫; 湿法脱硫工艺; 离子液体; 铁基
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(12)60373-5

Fe-based ionic liquid （Fe-IL） was synthesized by mixing FeCl3·6H2O and 1-butyl-3-methylimidazolium chloride [Bmim]C1 in this paper. The phase diagram of a ternary Fe-IL, ethanol and water system was investigated to construct a ternary desulfurization solution for wet flue gas desulfurization. The effects of flow rate and concentration of SO2, reaction temperature, pH and Fe-IL fraction in aqueous desulfurization solution on the desulfiariza- tion efficiency were investigated. The results shows that the best composition of ternary desulfurization solution of Fe-IL, ethanol and water is 1 ： 1.5 ： 3 by volume ratio, and pH should be controlled at 2.0. Under such conditions, a desulfurization rate greater than 90% could be obtained. The product of sulfuric acid had inhibition effect on the wet desulfurization process. With applying this new ternary desulfurization solution, not only the catalyst Fe-IL can be recycled and reused, but also the product sulfuric acid can be separated directly from the ternary desulfurization system.