Enhanced Pervaporation Performance of Multilayer PDMS/PVDF Composite Membrane for Ethanol Concentration
Multi-layer silicone/PVDF composite membrane with an alternative silicone/PVDF/non-woven-fiber/ PVDF/silicone configuration was developed by curing polydimethylsiloxane (PDMS) cast on porous PVDF substrate, which was obtained by coating PVDF solution on the double surface of non-woven fiber. The thickness of the active layer PDMS and the porous PVDF layer was ca. 10μm and 45μm respectively The multi-layer composite membrane was used for ethanol recovery by pervaporation, and exhibited enhanced separation performance compared with the common silicone/PVDF composite membranes, especially in the low ethanol concentration range. A novel phenomenon appeared that the variation of separation along with the temperature showed a turning point. The maximum separation factor was obtained at 60 ℃,and the total flux increased exponentially along with the increase of temperature. The composite membrane gave the best pervaporation performance with a separation factor of 15, permeation rate of 450g/m 2 h at a 5wt％ ethanol concentration at 60 ℃.
multi-layer PDMS pervaporation separation performance
Xia Zhan Jiding Li Yangzheng Lin Cuixian Chen
Membrane Technology & Engineering Research Center, Department of Chemical Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
国际会议
The 5th International Conference on Separation Science and Technology(第五届国际分离科学与技术会议)
北京
英文
2007-10-14（万方平台首次上网日期，不代表论文的发表时间）