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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 | Year: 2010

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.

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 | Year: 2010

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.

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