A durable ZSM-5/SS composite tubular membrane for the selective separation of p-xylene from its isomers

Tarditi, Ana María; Horowitz, Gabriel; Lombardo, E.A.

doi:10.1016/j.memsci.2006.04.041

Cited by 26 publications

(28 citation statements)

References 26 publications

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“…These tools were used to study the morphology of the composite and to confirm the thermal stability up to 400°C. The stability of this type of membranes was discussed in our previous work [18] and it was found that the membranes were stable after 1000 h of operation including several cycles between 25 and 400°C. Neither the selectivity nor the permeation of the membranes changed after this long time on stream.…”

Section: Xylene Permeation Measurements and Membranementioning

confidence: 89%

Xylene Isomerization in a ZSM-5/SS Membrane Reactor

Tarditi

Horowitz²,

Lombardo

2008

Catal Lett

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A membrane reactor containing different types of ZSM-5/porous SS membranes was used to perform the xylene isomerization reaction. The parent Na-ZSM-5 layer was synthesized by secondary growth on top of porous stainless steel tubes. The xylene isomerization reaction was carried out at different temperatures in the membrane reactor and in a fixed-bed reactor of identical geometry for comparison. Two different kinds of membranes were prepared by ion exchange: a Pt/H-ZSM-5 catalytic membrane and two Ba-ZSM-5 composites with different Ba 2+ concentration. The p-xylene production using 100% exchanged Ba-membrane was about 28% higher than the fixed-bed reactor at 370°C, when m-xylene was fed.

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Section: Xylene Permeation Measurements and Membranementioning

confidence: 89%

Xylene Isomerization in a ZSM-5/SS Membrane Reactor

Tarditi

Horowitz²,

Lombardo

2008

Catal Lett

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“…23 Therefore, it is crucial to maintain the correct separation conditions at low feed pressures in order to enhance the selectivity of pX over oX and mX by permeation through silicalite-1 membrane. 15 In the present study, design of experiments (DoE) prove to be a useful statistical (Table 4).…”

Section: Comparison With Published Resultsmentioning

confidence: 99%

“…The pX flux trend shows that the pores are the main pathway for the transport of pX across the silicalite-1 membrane, with little contribution from intercrystalline pores and pinholes. 23 The increase in pX feed partial pressure increased the permeation driving force and thus, increased pX flux (Fig. 5(a)).…”

Section: Statistical Analysis and Model Developmentmentioning

confidence: 96%

“…Therefore, mX and oX show similar transport behavior when diffused through the membrane. 23,31 The pX/oX and pX/mX separation factors show a maximum at 200…”

Section: Statistical Analysis and Model Developmentmentioning

confidence: 98%

“…The temperature dependence of the pX fluxes in this study was consistent with those separation results reported in the literature. 23,31 The pX flux is typical for molecular permeation in zeolite membrane controlled by an adsorption-diffusion mechanism. Under this mechanism, the increase in temperature reduces the surface coverage, which lowers the driving force for mass transfer but is counter-balanced by higher values of the diffusion coefficient, which increases the diffusitivity of adsorbed molecules.…”

Section: Statistical Analysis and Model Developmentmentioning

confidence: 99%

See 2 more Smart Citations

Separation of p‐xylene from ternary xylene mixture using silicalite‐1 membrane: process optimization studies

Yeong¹,

Abdullah²,

Ahmad³

et al. 2009

J of Chemical Tech & Biotech

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BACKGROUND: The design of experiments (DoE) is applied to the process optimization of p-xylene (pX) separation from its isomers m-xylene (mX) and o-xylene (oX) mixture using silicalite-1 membrane supported on α-alumina. A central composite design (CCD) coupled with response surface methodology (RSM) was used to correlate the effect of two separation process variables, temperature (150-250• C) and pX feed partial pressure (0.10-0.26 kPa) to three responses: (i) pX flux; (ii) pX/oX separation factor; and (iii) pX/mX separation factor. The significant factors affecting each response were elucidated from the analysis of variance (ANOVA). The interaction between two variables was investigated systematically based on threedimensional response surface plots.

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Pervaporation behavior of PVA membrane containing β‐cyclodextrin for separating xylene isomeric mixtures

Zhang

Liu

et al. 2012

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com).To evaluate molecular recognition function of -cyclodextrin to xylene isomers, -CD polymer of branching chain extension (-CD-EGDE) was synthesized by crosslinking -CD with ethylene glycol diglycidyl ether (EGDE). The pervaporation blend membranes of -CD-EGDE/PVA were prepared by casting an aqueous solution of PVA and -CD polymer mixture, and the membranes were used for separation of p-/m-and p-/o-xylene mixtures. It was observed that the pristine PVA membrane almost had no selectivity for xylene isomer mixtures. The PVA membrane incorporating -CD polymer had molecular recognition function, which selectively facilitated the transport of the xylene isomers. To ascertain pervaporation behavior, the sorption and desorption processes of the membrane in xylenes were investigated. The sorption result showed that the complex formation constant between -CDs and xylenes played a key role in swelling behavior. There was a significant difference between diffusion coefficients D and D 0 , calculated from the sorption and desorption measurements, respectively, indicating that the diffusivity selectivity in desorption stage may have remarkable effect on the total selectivity during pervaporation process.

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A durable ZSM-5/SS composite tubular membrane for the selective separation of p-xylene from its isomers

Cited by 26 publications

References 26 publications

Xylene Isomerization in a ZSM-5/SS Membrane Reactor

Xylene Isomerization in a ZSM-5/SS Membrane Reactor

Separation of p‐xylene from ternary xylene mixture using silicalite‐1 membrane: process optimization studies

Pervaporation behavior of PVA membrane containing β‐cyclodextrin for separating xylene isomeric mixtures

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