Chinese Journal of Applied Chemistry ›› 1994, Vol. 0 ›› Issue (2): 81-84.

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Alkali-Metal Ion Improved PVA Pervaporation Membrane

Zhang Guibao, Fu Shengquan, Zhang Keda   

  1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
  • Received:1993-07-20 Revised:1993-11-24 Published:1994-04-10 Online:1994-04-10

Abstract: The separation of ethanol/water mixture by pervaporation by crosslinked PVA-MA membrane containing LiCl,NaCl and KCl has been investigated.The flux increased markedly when salt content was less than 6 wt% in the dry membrane,and the separation factor increased when ethanol concentration in feed solution was high.The DSC results showed that the membranes adsorbed 5%~8wt% of free water from ethanol/water mixture (50/50wt/wt),which is hardly observed by weighing method.

Key words: pervaporation, membrane, poly(vinyl alcohol), ethanol separation