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Zeolite - A Membrane for Solvent Dehydration: An Overview and Review of Results, pp. 523-554 $100.00
Authors:  (Marc Pera-Titus, Joan Llorens - Chemical Engineering Department, Univ. of Barcelona, Spain)
This paper provides an overview and review (114 references) of own results in the
field of supported zeolite NaA membranes for solvent dehydration by pervaporation. One
of the main characteristics of Al-rich zeolite membranes, such as those based on zeolite A
and FAU frameworks, is their high ability to shrink due to mismatch between thermal
expansion coefficients of the support and the zeolite material in the presence of thermal
gradients. This is why for this kind of membranes, rather than forming very thin layers,
the synthesis of thick and well-intergrown layers by hydrothermal treatment using
convenient techniques is highly recommended. In this study, three of these techniques
have been surveyed in detail: (1) synthesis under the influence of a centrifugal force field,
(2) semi-continuous synthesis, and (3) synthesis in a continuous flow system. These
techniques have been compared one another in terms of pure N2 permeance and
pervaporation performance (total flux and selectivity) towards dehydration of short- and
long-chain primary alcohol/water binary mixtures for a collection of as-synthesized
zeolite NaA membranes. The intercrystalline porosity in the zeolite layers ascribed to
macro- and mesodefects has been measured using an original technique relying on the
evolution of the total pervaporated flux with the feed pressure. 

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Zeolite - A Membrane for Solvent Dehydration: An Overview and Review of Results, pp. 523-554