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Article

Gas Transport in Mixed Matrix Membranes: Two Methods for Time Lag Determination

1
Institute on Membrane Technology, CNR-ITM, Via P. Bucci 17/C, 87036 Rende (CS), Italy
2
Dipartimento di Chimica e Tecnologie Chimiche (CTC), Università della Calabria, 87036 Rende, Cosenza, Italy
3
Departamento de Química Inorgánica, Instituto de Ciencia Molecular (ICMol), Catedrático José Beltrán Martínez, 2, Universidad de Valencia, 46980 Paterna, Spain
*
Authors to whom correspondence should be addressed.
Computation 2020, 8(2), 28; https://doi.org/10.3390/computation8020028
Received: 20 March 2020 / Revised: 1 April 2020 / Accepted: 7 April 2020 / Published: 11 April 2020
The most widely used method to measure the transport properties of dense polymeric membranes is the time lag method in a constant volume/pressure increase instrument. Although simple and quick, this method provides only relatively superficial, averaged data of the permeability, diffusivity, and solubility of gas or vapor species in the membrane. The present manuscript discusses a more sophisticated computational method to determine the transport properties on the basis of a fit of the entire permeation curve, including the transient period. The traditional tangent method and the fitting procedure were compared for the transport of six light gases (H2, He, O2, N2, CH4, and CO2) and ethane and ethylene in mixed matrix membranes (MMM) based on Pebax®1657 and the metal–organic framework (MOF) CuII2(S,S)-hismox·5H2O. Deviations of the experimental data from the theoretical curve could be attributed to the particular MOF structure, with cavities of different sizes. The fitting procedure revealed two different effective diffusion coefficients for the same gas in the case of methane and ethylene, due to the unusual void morphology in the MOFs. The method was furthermore applied to mixed gas permeation in an innovative constant-pressure/variable-volume setup with continuous analysis of the permeate composition by an on-line mass-spectrometric residual gas analyzer. This method can provide the diffusion coefficient of individual gas species in a mixture, during mixed gas permeation experiments. Such information was previously inaccessible, and it will greatly enhance insight into the mixed gas transport in polymeric or mixed matrix membranes. View Full-Text
Keywords: gas separation; transport phenomena; diffusion; mixed gas diffusion; mixed matrix membranes; MOF; time lag method; on-line mass spectrometry gas separation; transport phenomena; diffusion; mixed gas diffusion; mixed matrix membranes; MOF; time lag method; on-line mass spectrometry
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MDPI and ACS Style

Fuoco, A.; Monteleone, M.; Esposito, E.; Bruno, R.; Ferrando-Soria, J.; Pardo, E.; Armentano, D.; Jansen, J.C. Gas Transport in Mixed Matrix Membranes: Two Methods for Time Lag Determination. Computation 2020, 8, 28. https://doi.org/10.3390/computation8020028

AMA Style

Fuoco A, Monteleone M, Esposito E, Bruno R, Ferrando-Soria J, Pardo E, Armentano D, Jansen JC. Gas Transport in Mixed Matrix Membranes: Two Methods for Time Lag Determination. Computation. 2020; 8(2):28. https://doi.org/10.3390/computation8020028

Chicago/Turabian Style

Fuoco, Alessio; Monteleone, Marcello; Esposito, Elisa; Bruno, Rosaria; Ferrando-Soria, Jesús; Pardo, Emilio; Armentano, Donatella; Jansen, Johannes C. 2020. "Gas Transport in Mixed Matrix Membranes: Two Methods for Time Lag Determination" Computation 8, no. 2: 28. https://doi.org/10.3390/computation8020028

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