High-performance hybrid pervaporation membranes with superior hydrothermal and acid stability


Castricum, Hessel L. and Kreiter, Robert and Veen, Henk M. van and Blank, Dave H.A. and Vente, Jaap F. and Elshof, Johan E. ten (2008) High-performance hybrid pervaporation membranes with superior hydrothermal and acid stability. Journal of Membrane Science, 324 (1-2). pp. 111-118. ISSN 0376-7388

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Abstract:A new organic–inorganic hybrid membrane has been prepared with exceptional performance in dewatering applications. The only precursor used in the sol–gel synthesis of the selective layer was organically linked 1,2-bis(triethoxysilyl)ethane (BTESE). The microporous structure of this layer enables selective molecular sieving of small molecules from larger ones. In the dehydration of n-butanol with 5% of water, the membrane shows a high separation factor of over 4000 and ultra-fast water transport at a rate of more than 20 kg m−2 h−1 at 150 °C. This can be related to the high adsorption capacity of the material and the sub-micron thickness of the selective layer. The selectivity has now remained constant over almost one and a half years under continuous process testing conditions. Apart from the hydrothermal stability, the membrane exhibits a high tolerance for acid contamination. A slow performance decline in flux and separation factor is only observed at a pH lower than 2. The high stability and effective separation indicate a broad industrial application potential of the hybrid membrane material.
Item Type:Article
Copyright:© 2008 Elsevier
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/78907
Official URL:https://doi.org/10.1016/j.memsci.2008.07.014
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