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Titolo:
Separation of close-boiling hydrocarbon mixtures by MFI and FAU membranes made by secondary growth
Autore:
Nair, S; Lai, ZP; Nikolakis, V; Xomeritakis, G; Bonilla, G; Tsapatsis, M;
Indirizzi:
Univ Massachusetts, Dept Chem Engn, Amherst, MA 01003 USA Univ Massachusetts Amherst MA USA 01003 Chem Engn, Amherst, MA 01003 USA
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 1-3, volume: 48, anno: 2001,
pagine: 219 - 228
SICI:
1387-1811(20011101)48:1-3<219:SOCHMB>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
ZEOLITE MEMBRANES; PERMEATION; MICROSCOPY; FILMS; SIZE;
Keywords:
membrane; xylene; permeation; faujasite; grain boundaries;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Tsapatsis, M Univ Massachusetts, Dept Chem Engn, 159 Goessmann Lab, Amherst, MA 01003 USA Univ Massachusetts 159 Goessmann Lab Amherst MA USA 01003 USA
Citazione:
S. Nair et al., "Separation of close-boiling hydrocarbon mixtures by MFI and FAU membranes made by secondary growth", MICROP M M, 48(1-3), 2001, pp. 219-228

Abstract

We summarize and discuss recent results on the separation of close-boilinghydrocarbon mixtures by means of zeolite membranes. We focus on the separation of xylene isomers using silicalite (MFI) membranes. as well as severalother hydrocarbon mixtures using faujasite membranes. In the case of the silicalite membranes, the selectivity is found to depend on the membrane microstructure. Permeation of xylene isomers through the silicalite membranes occurs through both zeolitic and non-zeolitic (intercrystalline) nanopores. This hypothesis is supported by vapor-phase permeation results on silicalite membranes synthesized with different microstructures, and by confocal microscopy experiments. In addition, a simple method for repairing calcination-induced membrane defects is presented, and its application is found to beessential in obtaining high (20-300) p-xylene/o-xylene separation factors. The faujasite membranes are found to have high selectivities (40-150) in the separation of binary mixtures containing one aromatic component, and modest selectivities (4-9) for the separation of unsaturated from saturated low-molecular-weight hydrocarbons. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 21/09/20 alle ore 09:42:10