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Sebastian V.,University of Zaragoza | Mallada R.,University of Zaragoza | Coronas J.,University of Zaragoza | Julbe A.,Montpellier University | And 2 more authors.
Journal of Membrane Science

The supported zeolite membranes prepared in this work have been synthesised under microwave heating in order to reduce synthesis time, to prevent support dissolution, and to reproducibly obtain a thin defect-free zeolite layer. The MFI-type zeolite membranes were synthesised on ceramic capillaries, with a high membrane surface area-to-volume ratio (>1000 m2 m-3), which is by far higher than that of classical tubular supports (≪500 m2 m-3). The selective layer was deposited inside, outside or on both sides of the capillaries. These hydrophobic membranes were characterized and tested in pervaporation for the separation of an EtOH/H2O: 5/95 wt.% mixture. The best results obtained at a pervaporation temperature of 45 °C, in terms of flux (1.5 kg/h m2) and selectivity (αEtOH/ H2 O = 54), were achieved with the double-sided membranes. © 2010 Elsevier B.V. All rights reserved. Source

Sebastian V.,University of Zaragoza | Motuzas J.,Montpellier University | Dirrix R.W.J.,Hyflux CEPAration Technologies Europe | Terpstra R.A.,Hyflux CEPAration Technologies Europe | And 2 more authors.
Separation and Purification Technology

Titanium silicalite-1 (TS-1) membranes were obtained on α-Al 2O3 capillaries by secondary growth of silicalite-1 seeds under microwave irradiation. TS-1 membranes were grown at 180-190 °C either on the outer side or on both sides of the capillaries, from sols with a molar ratio Si/Ti = 16-75. All the derived membranes were gas-tight before template calcination (no macro-defects) although the highest Si/Ti ratios lead to higher membrane quality with N2/SF6 > 100 for single gases and separation factors up to 65 for EtOH/H2O mixture separation by pervaporation (EtOH flux up to 2.2 kg/h m2 at 65 °C). The reproducibility of membrane performance, with good balance between flux and selectivity, is highly attractive for further industrial applications of these TS-1 membranes which are currently developed on multi-capillary modules. © 2010 Elsevier B.V. All rights reserved. Source

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