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X-type zeolite membranes: preparation, characterization, and pervaporation performance

✍ Scribed by Shiguang Li; Vu A. Tuan; John L. Falconer; Richard D. Noble

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
275 KB
Volume
53
Category
Article
ISSN
1387-1811

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✦ Synopsis

X-type zeolite membranes were prepared by a template-free method on porous tubular supports. The best membrane was prepared as one zeolite layer on a c-Al 2 O 3 support and it had a tri-isopropyl benzene pervaporation flux of 2.3 g/ m 2 h at 300 K. This membrane separated 1,3-propanediol from glycerol in aqueous mixtures by pervaporation; at 308 K, the total flux was 2.7 kg/m 2 h, and the 1,3-propanediol/glycerol selectivity was 41. All the component fluxes and the 1,3-propanediol/glycerol selectivity increased with temperature, but the water flux increased faster than fluxes of the other species. The high 1,3-propanediol/glycerol selectivity was due to preferential adsorption of 1,3-propanediol.

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