Preparation of inner-side tubular zeolite NaA membranes in a continuous flow system

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• 作者：Marc Pera-Titus ; Marta Bausach ; Joan Llorens ; Fidel Cunill
• 关键词：Zeolite membrane ; Continuous synthesis ; Pervaporation ; Alcohol dehydration ; Intercrystalline pathways
• 刊名：Separation and Purification Technology
• 出版年：2008
• 出版时间：15 February 2008
• 年：2008
• 卷：59
• 期：2
• 页码：141-150
• 全文大小：899 K

文摘

Zeolite NaA membranes were synthesized on the inner side of porous titania (rutile) asymmetric tubular supports in a flow system where the synthesis gel was circulated through the support with flow rates in the range 1.5–4 mL min⁻¹ by the action of gravity. The syntheses were carried out hydrothermally at 358 K for 6–7 h either with or without previous brush-seeding of the supports. The membranes (10–20 μm in thickness) showed great ability to dehydrate ethanol/water mixtures (92:8, w/w) by pervaporation with selectivities and fluxes, respectively, up to 8500 and 1.2 kg m⁻² h⁻¹ at 323 K. The role of intercrystalline defects in the pervaporation performance of the synthesized membranes was also investigated.