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Titolo:
p-xylene separation with MFI-type zeolite membrane
Autore:
Sakai, H; Tomita, T; Takahashi, T;
Indirizzi:
NGK Insulators Ltd, Separat Membrane Project, Proc & Applicat Dev Div, Corp Tech Ctr,Mizuho Ku, Nagoya, Aichi 4678530, Japan NGK Insulators Ltd Nagoya Aichi Japan 4678530 agoya, Aichi 4678530, Japan
Titolo Testata:
SEPARATION AND PURIFICATION TECHNOLOGY
fascicolo: 1-3, volume: 25, anno: 2001,
pagine: 297 - 306
SICI:
1383-5866(20011001)25:1-3<297:PSWMZM>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERMEATION; FILMS; VAPORS; GROWTH; VIEW;
Keywords:
xylene isomer separation; MFI; zeolite membrane; self-supporting; vapor permeation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Sakai, H NGK Insulators Ltd, Separat Membrane Project, Proc & Applicat DevDiv, Corp Tech Ctr,Mizuho Ku, 2-56 Suda Cho, Nagoya, Aichi 4678530, Japan NGK Insulators Ltd 2-56 Suda Cho Nagoya Aichi Japan 4678530 Japan
Citazione:
H. Sakai et al., "p-xylene separation with MFI-type zeolite membrane", SEP PURIF T, 25(1-3), 2001, pp. 297-306

Abstract

Several authors reported the separation of xylene isomers through MFI-typezeolite membrane, however, the results were inconsistent. They used the alumina support and the defects can be induced in the zeolite membrane duringthe calcination due to the thermal expansion mismatch between alumina support and zeolite membrane. In this study, the self-supporting MFI-type zeolite membrane was used to avoid the defect formation. The self-supporting MFI-type zeolite was fabricated on Teflon plate in an autoclave at 353 K for 24-96 h. The vapor permeation were carried out by Wicke-Kallenbach method inthe nitrogen gas flow to examine the p-xylene separation from the ternary mixture of xylene isomers as a function of time up to 72 h, temperature between 303 and 673 K, feed partial pressure between 0.3 and 5.1 kPa and membrane thickness between 60 and 130 mum. The permeation flux of p-xylene showed the maximum at 473 K in the p-xylene partial pressure of 0.3 kPa. This could be described by the competitive effects between the amount of equilibrium adsorption and the diffusivity. The permeation of m- and o-xylene were small values and almost constant between 473 and 673 K. As a result, the separation factors of p- to m-xylenes and p- to o-xylenes showed the maximum value of 250 at 473 K. From 473 to 673 K, the permeation flux was proportional to the partial pressure both in the single component feed and the ternary mixture of xylene isomers. The permeation flux of p-xylene depended little on the apparent membrane thickness from 130 to 60 mum. It is suggested from the microstructure of the membrane that the dense layer may not be the entire thickness but part of the thickness. We concluded that the MFI-type zeolite membrane can separate the p-xylene selectively from the ternary mixture of xylene isomers above 473 K. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 18:28:39