咪唑类离子液体混合物用于二氧化硫高效吸收  

High capacity absorption of SO2 using imidazole ionic liquid mixtures

作　　者：张雅婷 熊文杰 赵天翔 姚晨飞 丁宇宬 张效敏 吴有庭[1] 胡兴邦[1] ZHANG Yating;XIONG Wenjie;ZHAO Tianxiang;YAO Chenfei;DING Yucheng;ZHANG Xiaomin;WU Youting;HU Xingbang(School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,Jiangsu,China;School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,Guizhou,China;Key Laboratory of Green Chemical and Clean Energy Technology,Guizhou University,Guiyang 550025,Guizhou,China)

机构地区：[1]南京大学化学化工学院,江苏南京210023 [2]贵州大学化学与化工学院,贵州贵阳550025 [3]贵州大学绿色化工与清洁能源技术重点实验室,贵州贵阳550025

出　　处：《化工学报》2020年第11期5035-5042,共8页CIESC Journal

基　　金：国家自然科学基金项目(21676134,21878141);贵州大学自然科学专项基金(X2019065)。

摘　　要：开发易制备、价格便宜、面向SO2气体高效分离的离子液体(ILs),是当前ILs从实验探索迈向工业应用的难点与重大挑战。合成了不同摩尔比(3∶1、2∶1、1∶1、1∶2和1∶3)的1-乙基-3-甲基咪唑氯盐([Emim][Cl])和1-乙基-3-甲基咪唑乙酸盐([Emim][OAc])的离子液体混合物[Emim][Cl]x[OAc]1-x,在测定其密度、黏度、热稳定性等基本物性数据的基础上,研究了[Emim][Cl]x[OAc]1-x混合物在不同温度和SO2分压下的SO2吸收能力。结果表明,[Emim][Cl]x[OAc]1-x能够有效地捕获SO2。[Emim][Cl]与[Emim][OAc]之间存在协同促进作用,有利于实现SO2高效吸收。[Emim][Cl]0.33[OAc]0.66混合液在1.0和0.2atm(1atm=101325Pa)下捕获SO2量分别为(1.34±0.08)和(0.74±0.05)g/g,与现有结果相比,混合物在SO2捕获方面有明显优势。此外,这些离子液体混合物对二氧化硫的吸收和解吸具有良好的可逆性。The capture of sulfur dioxide(SO2)with readily available and cost-effective ionic liquids(ILs)is one of the challenges for the application of ILs.Here,we synthesized the ILs mixtures with different molar ratios(3∶1,2∶1,1∶1,1∶2,and 3∶1)of 1-ethyl-3-methylimidazolium chloride([Emim][Cl])and 1-ethyl-3-methylimidazolium acetate([Emim][OAc])to study their SO2 absorption capacities.The SO2 solubilities in these mixtures were investigated under different conditions.The SO2 absorption capacities of[Emim][Cl]x[OAc]1-x at different temperatures and SO2 partial pressure were measured.The results show that ILs can effectively capture SO2.There exists a synergistic promotion effect between[Emim][Cl]and[Emim][OAc],resulting in quite high SO2 absorption capacity.The[Emim][Cl]0.33[OAc]0.66 mixture can capture SO2(1.34±0.08)and(0.74±0.05)g/g at 1.0 and 0.2 atm(1 atm=101325 Pa),respectively.Comparing with the reported data,[Emim][Cl]x[OAc]1-x mixtures show obvious advantage for SO2 capture.In addition,these ionic liquid mixtures have good reversibility for the absorption and desorption of sulfur dioxide.

关 键 词：离子液体 物理性质 吸收 二氧化硫 解吸 

分 类 号：O69[理学—化学] TQ424.3[化学工程]