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Black plate (262,1) 8.1 Zeolite-containing membranes Zeolite membranes have been prepared with the aim of providing molecular separators, e.g. for the drying of bioethanol, by separating water from it, for use as a fuel (Figure 11). Zeolite NaA membranes have been prepared with reproducible structures by seeded hydro- thermal synthesis on the inner-side of porous alpha-alumina tubular supports, using a semi-continuous system in which the gel was periodically renewed inside the tubes. A cross-flow filtration technique was used which permitted a controlled seeding of zeolite NaA crystals from a suspension. The influence of the renewal rate during the synthesis, as well as the seeding weight gain (SWG), on the pervaporation performance of the membranes prepared was investigated. An optimal SWG value was found to be around 0.15 mg cm 2 of membrane area. The use of a semi- continuous system was able to furnish zeolite membranes with selectivities up to 16,000 at fluxes of 0.50kg m2 h1 at 323K for the pervaporation of 90 : 10 wt% ethanolywater mixtures134. Zeolite NaA membranes were investigated for the pervaporation (PV) of Fig. 11. Dehydration system employing a zeolite membrane, advanced by Mitsui and Engineering and Shipbuilding Co. for drying bioethanol for use as a fuel. http://s169.photobucket.com/albums/u238/biopact2/th_biopact_zeolite_membrane.jpg Reproduced with permission from Biopact. 262 Christopher J. RhodesPDF Image | Properties and applications of zeolites
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