Dehydration performance of a hydrophobic DD3R zeolite membrane |
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Authors: | Jelan Kuhn Kenji Yajima Toshihiro Tomita Joachim Gross Freek Kapteijn |
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Affiliation: | 1. Process & Energy Laboratory, Delft University of Technology, Leeghwaterstraat 44, 2628 CA Delft, The Netherlands;2. NGK Insulators, LTD. NCM Project, New Products Development Center, 2-56 Suda-cho, Mizuho, Postal Code 467-8530, Nagoya, Japan;3. Catalysis Engineering - The Pore, DelftChemTech, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands |
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Abstract: | The all silica DDR membrane turns out to be well suited to separate water from organic solvents under pervaporation conditions, despite its hydrophobic character. All-silica zeolites are chemically and hydrothermally more stable than aluminum containing ones and are therefore preferred for membrane applications, including for dehydration, even though these type of membranes are hydrophobic. Permeation of water, ethanol and methanol through an all-silica DDR membrane has been measured at temperatures ranging from 344 to 398 K. The hydrophobic membrane shows high water fluxes (up to 20 kg m−2 h−1). The pure water permeance is insensitive to temperature and is well described assuming weak adsorption. Excellent performance in dewatering ethanol (N=2 kg m−2 h−1and αw=1500 at 373 K and xw=0.18) is observed and the membrane is also able to selectively remove water from methanol (N=5 kg m−2 h−1 and αw=9). Water could also be removed from methanol/ethanol/water (αwater/EtOH=1500, αMeOH/EtOH=70 at 373 K) mixtures, even at water feed concentrations below 1.5 mol%. |
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Keywords: | Zeolite membrane DDR Pervaporation Dehydration |
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