Chinese Journal of Chemical Engineering ›› 2012, Vol. 20 ›› Issue (4): 625-632.

• 分离科学与工程 • 上一篇    下一篇

ZSM-5填充PDMS复合膜渗透蒸发分离乙醛水溶液

伍艳辉; 谭惠芬; 李佟茗; 金源   

  1. Department of Chemistry, Tongji University, Shanghai 200092, China
  • 收稿日期:2011-02-22 修回日期:2011-09-06 出版日期:2012-08-28 发布日期:2011-09-06

Pervaporation of aqueous solution of acetaldehyde through ZSM-5 filled PDMS composite membrane

WU Yanhui; TAN Huifen; LI Dongming; JIN Yuan   

  1. Department of Chemistry, Tongji University, Shanghai 200092, China
  • Received:2011-02-22 Revised:2011-09-06 Online:2012-08-28 Published:2011-09-06

摘要: Hydrophobic ZSM-5 zeolite filled polydimethylsiloxane (PDMS) composite membranes with Nylon micro-filtration membrane as the support layer were prepared to separate acetaldehyde from its aqueous solution. The composite membranes were characterized by Fourier transform infrared spectroscopy and X-ray diffraction. Their structural morphology and thermal stability were also examined. The swelling study showed that the composite membranes presented higher degree of swelling in aqueous solution of acetaldehyde than in pure water at 25?C, suggesting that the membranes have stronger sorption capacity in acetaldehyde solution. The effects of ZSM-5 fill-ing content and acetaldehyde concentration on pervaporation performance of composite membranes were investi-gated. The permeation experiments at different temperatures showed that both selectivity and permeation flux of composite membranes increased with temperature. With 5%ZSM-5-PDMS/Nylon membrane at acetaldehyde mass concentration of 8% and 25?C, the separation factor of acetaldehyde/water achieved 35 and the permeation flux was 233.3 g•m?2•h?1.

关键词: pervaporation, acetaldehyde, polydimethylsiloxane membrane, ZSM-5

Abstract: Hydrophobic ZSM-5 zeolite filled polydimethylsiloxane (PDMS) composite membranes with Nylon micro-filtration membrane as the support layer were prepared to separate acetaldehyde from its aqueous solution. The composite membranes were characterized by Fourier transform infrared spectroscopy and X-ray diffraction. Their structural morphology and thermal stability were also examined. The swelling study showed that the composite membranes presented higher degree of swelling in aqueous solution of acetaldehyde than in pure water at 25?C, suggesting that the membranes have stronger sorption capacity in acetaldehyde solution. The effects of ZSM-5 fill-ing content and acetaldehyde concentration on pervaporation performance of composite membranes were investi-gated. The permeation experiments at different temperatures showed that both selectivity and permeation flux of composite membranes increased with temperature. With 5%ZSM-5-PDMS/Nylon membrane at acetaldehyde mass concentration of 8% and 25?C, the separation factor of acetaldehyde/water achieved 35 and the permeation flux was 233.3 g•m?2•h?1.

Key words: pervaporation, acetaldehyde, polydimethylsiloxane membrane, ZSM-5