Concentration polarization in SAPO-34 membranes at high pressures

Avila, Adolfo M.; Funke, Hans H.; Zhang, Yanfeng; Falconer, John L.; Noble, Richard D.

doi:10.1016/j.memsci.2009.02.028

Cited by 86 publications

(38 citation statements)

References 11 publications

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“…The concentration polarization is due to the limitation of diffusion on the feed side. Increasing the feed flow rate enhances the mixing and therefore reduces concentration polarization [28,29]. Fig.…”

Section: Permeation Results For Binary Mixtures Of Gasesmentioning

confidence: 99%

Synthesis of ceramic hollow fiber supported zeolitic imidazolate framework-8 (ZIF-8) membranes with high hydrogen permeability

Pan

Wang

Lai

2012

Journal of Membrane Science

199

121

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Section: Permeation Results For Binary Mixtures Of Gasesmentioning

confidence: 99%

Synthesis of ceramic hollow fiber supported zeolitic imidazolate framework-8 (ZIF-8) membranes with high hydrogen permeability

Pan

Wang

Lai

2012

Journal of Membrane Science

199

121

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“…The effect of concentration polarisation was assessed by determining the concentration polarisation index:

\frac{n_{m}}{n_{b}} = \exp (J_{v} / k_{c}) + \frac{n_{p}}{n_{b}} true[1 - \exp (J_{v} / k_{c}) true],

where n m is the mole fraction at the zeolite film—gas interface, n b is the mole fraction in the gas bulk, k c is the mass transfer coefficient, J v is the volumetric flux, and n p is the mole fraction in the permeate. The mass transfer coefficient is usually determined from correlations of the Sherwood ( Sh ) number as a function of the Reynolds ( Re ) and Schmidt ( Sc ) numbers.…”

Section: Methodsmentioning

confidence: 99%

Efficient separation of N₂ and he at low temperature using MFI membranes

Grahn

Korelskiy

et al. 2016

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com) Ultra-thin MFI membranes were evaluated for N 2 /He separation over the temperature range of 85-260 K for the first time. The membranes were rather nitrogen selective at all the conditions investigated. A highest N 2 /He selectivity of 75.7 with a high N 2 flux of 83 kg/m 2 /h was observed at 124 K. The separation was attributed to adsorption selectivity to N 2 , effectively hindering the transport of He in the zeolite pores. The exceedingly high permeance even at low temperatures was ascribed to the ultrathin (<1lm) membrane used. As the pressure ratios increased, a better separation performance was obtained. A mathematical model showed the largest difference of adsorbed loading over the film at ca. 120 K was the main reason for the observed maximum selectivity. Further, the modelling indicated the selectivity would increase 2-3 times by reducing the influence of defects, concentration polarization, and pressure drop over the support.

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“…8,21 The feed ow rate was up to 8000 standard mL min À1 (SMLPM) to minimize concentration polarization. 22 The permeate pressure was kept at 0.103 MPa (absolute pressure; atmospheric pressure is 0.101 MPa). Mass ow controllers were used to control the molar ratio of each component.…”

Section: Characterization and Separation Performancementioning

confidence: 99%

Improved AlPO-18 membranes for light gas separation

Wang

et al. 2015

J. Mater. Chem. A

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High-quality AlPO-18 membranes were synthesized using low-cost symmetric alumina supports by a single hydrothermal step, and showed to be useful for light gas separation. Single-gas permeances of CO 2 , N 2 , CH 4 and C 3 H 8 decreased with increasing kinetic diameter. Single CO 2 and CH 4 permeance dependence of pressure drop was predicted by the Maxwell-Stefan diffusion model and was in agreement with experimental data. The best AlPO-18 membrane showed smaller-component permeances of 6.5, 6.3 and 1.0 Â 10 À7 mol (m 2 s Pa) À1 (equal to 1940, 1880 and 300 GPU) and mixture selectivities of 220, 45 and 22 for equimolar CO 2 /CH 4 , CO 2 /N 2 and H 2 /CH 4 binary mixtures at room temperature and 0.2 MPa pressure drop, respectively. The effects of temperature and pressure on the membrane's separation performance in the three binary mixtures were discussed.

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Concentration polarization in SAPO-34 membranes at high pressures

Cited by 86 publications

References 11 publications

Synthesis of ceramic hollow fiber supported zeolitic imidazolate framework-8 (ZIF-8) membranes with high hydrogen permeability

Synthesis of ceramic hollow fiber supported zeolitic imidazolate framework-8 (ZIF-8) membranes with high hydrogen permeability

Efficient separation of N₂ and he at low temperature using MFI membranes

Improved AlPO-18 membranes for light gas separation

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Concentration polarization in SAPO-34 membranes at high pressures

Cited by 86 publications

References 11 publications

Synthesis of ceramic hollow fiber supported zeolitic imidazolate framework-8 (ZIF-8) membranes with high hydrogen permeability

Synthesis of ceramic hollow fiber supported zeolitic imidazolate framework-8 (ZIF-8) membranes with high hydrogen permeability

Efficient separation of N2 and he at low temperature using MFI membranes

Improved AlPO-18 membranes for light gas separation

Contact Info

Product

Resources

About

Efficient separation of N₂ and he at low temperature using MFI membranes