A durable ZSM-5/SS composite tubular membrane for the selective separation of p-xylene from its isomers
✍ Scribed by Ana M. Tarditi; Gabriel I. Horowitz; E.A. Lombardo
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 589 KB
- Volume
- 281
- Category
- Article
- ISSN
- 0376-7388
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✦ Synopsis
A ZSM-5 membrane synthesized on a stainless steel porous tube was used for the separation of p-xylene from its isomers, m-and o-xylene. The membrane was prepared by secondary growth on the outer surface of the support. The permeation regime through the membrane was described by a combination of adsorption-diffusion steps. In order to examine the durability of the membrane, a sequence of three thermal cycles was conducted. N 2 permeation measurements together with scanning electron microscopy (SEM) observations were the tools used to detect whether or not cracks developed after exposure to the xylene isomers up to 400 • C. After 1000 h on stream, the membrane was selective to p-xylene, the N 2 permeance fluxes remained unchanged and the SEM micrographs did not reveal any discontinuity.