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.
作者
张雅婷
熊文杰
赵天翔
姚晨飞
丁宇宬
张效敏
吴有庭
胡兴邦
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)
出处
《化工学报》
EI
CAS
CSCD
北大核心
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)。
关键词
离子液体
物理性质
吸收
二氧化硫
解吸
ionic liquids
physical property
absorption
sulfur dioxide
desorption
