摘要
研究离子液体"填充型"支撑液膜制备规律,以及操作条件对苯/环己烷混合物蒸汽渗透分离过程影响。利用[C4mim][BF4]、[C8mim][BF4]、[C4mim][PF6]、[C6mim][PF6]、[4-Mebupy][BF4]、[3-Mebupy][BF4]离子液体分别制备支撑液膜,用于苯/环己烷混合物蒸汽渗透膜分离过程研究。实验比较了离子液体的种类、操作温度、原料液浓度等因素对苯/环己烷混合体系的蒸汽渗透膜分离性能的影响,其中[3-Mebupy][BF4]制得的支撑液膜对等体积配比的苯和环己烷混合物分离效果最佳,30℃时渗透通量为11.4g?m2?h?1,分离因子可达32.85。通过长时间运行的稳定性实验,证实离子液体支撑液膜的蒸汽渗透过程能够实现苯和环己烷的有效分离,具备良好的稳定性。离子液体"填充型"支撑液膜有望成为降低芳烃/烷烃等有机溶剂体系分离过程能耗的有效途径。
The preparation process of the filling-type supported liquid membranes filled with different ionic liquids,such as [C4min][BF4],[C8min][BF4],[C4min][PF6],[C6min][PF6],[4-Mebupy][BF4] and [3-Mebupy][BF4],was investigated respectively,and the influences of the operation conditions of preparation on the vapor permeation performances of the prepared supported ionic liquid membranes （SILMs） were studied via the experiments of benzene/cyclohexane separation with those prepared SILMs. The effects of ionic liquid species in the SILM used,benzene concentration in feed and the operation temperature of the separation process on permeability and selectivity of the prepared SILMs were studied systemically. The results show that,for benzene/cyclohexane separation,the membrane filled with [3-Mebupy][BF4] exhibits the most excellent separation performance with permeation flux of 11.4 g·m^2·h^-1 and separation factor of 32.85 at 30℃. The long-term vapor permeation tests of the [3-Mebupy][BF4]SILM show that the separation performance stability of this SILM for benzene/cyclohexane mixture is good. This study shows that the use of the filling-type supported liquid membranes filled with ionic liquid may become a promising approach to reduce the energy consumption for the separation of aromatic/paraffin mixture.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2009年第5期762-767,共6页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(20676068
20876086)
国家"973"项目(2003CB615701)
关键词
离子液体
支撑液膜
苯/环己烷混合物
蒸汽渗透
ionic liquids
supported liquid membrane
benzene/cyclohexane mixture
vapor permeation
