Korean Membrane Journal

The Membrane Society of Korea (한국막학회)
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Effect of Salt on Facilitated Propylene Transport through Crosslinked PVA/Silver Salt Complex Membranes

  • Kim, Jong-Hak (Department of Chemical Engineering, Yonsei University) ;
  • Min, Byoung-Ryul (Department of Chemical Engineering, Yonsei University) ;
  • Lee, Ki-Bong (Department of Chemical Engineering, Perdue University, West Lafayette) ;
  • Kang, Yong-Soo (Department of Chemical Engineering, Hanyang University)
  • Published : 2006.12.31
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Abstract

Complex membranes consisting of silver salt ($AgBF_4,\;AgCF_3SO_3,\;AgSbF_6,\;AgNO_3$) and poly(vinyl alcohol) (PVA) or crosslinked PVA (CPVA) were prepared and tested for the separation of propylene/propane mixtures. For the tested membranes, the complex membranes containing $AgBF_4$ exhibited the highest separation properties, i.e., approximately 20 GPU ($1 GPU=10^{-6}cm^3 (STP)/(cm^2 sec cmHg)$) and 100 of selectivity at 0.2 of silver mole fraction. The CPVA membranes containing silver salt always showed higher selectivity than PVA membranes, presenting silver ions coordinated to -CHO are more effective than those to -OH groups. The threshold silver concentration of CPVA membranes was lower than that of PVA membranes, which might be due to stronger interaction of silver ions with -CHO than that with -OH. The composition at which the selectivity is the highest did not significantly depend on the crosslinking, but did on the kind of silver salt.

Keywords

References

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