Mixed-Gas Selectivity Based on Pure Gas Permeation Measurements: An Approximate Model

An approximate model based on friction-coefficient formalism is developed to predict the mixed-gas permeability and selectivity of polymeric membranes. More specifically, the model is a modification of Kedem’s approach to flux coupling. The crucial assumption of the developed model is the division o...

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Autores principales:	Alexander O. Malakhov, Vladimir V. Volkov
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	model gas separation selectivity permeability coupling polymer membranes Chemical technology TP1-1185 Chemical engineering TP155-156
Acceso en línea:	https://doaj.org/article/1988ba3886b84cfb9c1c576d5f558b93
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spelling	oai:doaj.org-article:1988ba3886b84cfb9c1c576d5f558b932021-11-25T18:19:40ZMixed-Gas Selectivity Based on Pure Gas Permeation Measurements: An Approximate Model10.3390/membranes111108332077-0375https://doaj.org/article/1988ba3886b84cfb9c1c576d5f558b932021-10-01T00:00:00Zhttps://www.mdpi.com/2077-0375/11/11/833https://doaj.org/toc/2077-0375An approximate model based on friction-coefficient formalism is developed to predict the mixed-gas permeability and selectivity of polymeric membranes. More specifically, the model is a modification of Kedem’s approach to flux coupling. The crucial assumption of the developed model is the division of the inverse local permeability of the mixture component into two terms: the inverse local permeability of the corresponding pure gas and the term proportional to the friction between penetrants. Analytical expressions for permeability and selectivity of polymeric membranes in mixed-gas conditions were obtained within the model. The input parameters for the model are ideal selectivity and solubility coefficients for pure gases. Calculations have shown that, depending on the input parameters and the value of the membrane Peclét number (the measure of coupling), there can be both a reduction and an enhancement of selectivity compared to the ideal selectivity. The deviation between real and ideal selectivity increases at higher Peclét numbers; in the limit of large Peclét numbers, the mixed-gas selectivity tends to the value of the ideal solubility selectivity. The model has been validated using literature data on mixed-gas separation of <i>n</i>-butane/methane and propylene/propane through polymeric membranes.Alexander O. MalakhovVladimir V. VolkovMDPI AGarticlemodelgas separationselectivitypermeabilitycouplingpolymer membranesChemical technologyTP1-1185Chemical engineeringTP155-156ENMembranes, Vol 11, Iss 833, p 833 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	model gas separation selectivity permeability coupling polymer membranes Chemical technology TP1-1185 Chemical engineering TP155-156
spellingShingle	model gas separation selectivity permeability coupling polymer membranes Chemical technology TP1-1185 Chemical engineering TP155-156 Alexander O. Malakhov Vladimir V. Volkov Mixed-Gas Selectivity Based on Pure Gas Permeation Measurements: An Approximate Model
description	An approximate model based on friction-coefficient formalism is developed to predict the mixed-gas permeability and selectivity of polymeric membranes. More specifically, the model is a modification of Kedem’s approach to flux coupling. The crucial assumption of the developed model is the division of the inverse local permeability of the mixture component into two terms: the inverse local permeability of the corresponding pure gas and the term proportional to the friction between penetrants. Analytical expressions for permeability and selectivity of polymeric membranes in mixed-gas conditions were obtained within the model. The input parameters for the model are ideal selectivity and solubility coefficients for pure gases. Calculations have shown that, depending on the input parameters and the value of the membrane Peclét number (the measure of coupling), there can be both a reduction and an enhancement of selectivity compared to the ideal selectivity. The deviation between real and ideal selectivity increases at higher Peclét numbers; in the limit of large Peclét numbers, the mixed-gas selectivity tends to the value of the ideal solubility selectivity. The model has been validated using literature data on mixed-gas separation of <i>n</i>-butane/methane and propylene/propane through polymeric membranes.
format	article
author	Alexander O. Malakhov Vladimir V. Volkov
author_facet	Alexander O. Malakhov Vladimir V. Volkov
author_sort	Alexander O. Malakhov
title	Mixed-Gas Selectivity Based on Pure Gas Permeation Measurements: An Approximate Model
title_short	Mixed-Gas Selectivity Based on Pure Gas Permeation Measurements: An Approximate Model
title_full	Mixed-Gas Selectivity Based on Pure Gas Permeation Measurements: An Approximate Model
title_fullStr	Mixed-Gas Selectivity Based on Pure Gas Permeation Measurements: An Approximate Model
title_full_unstemmed	Mixed-Gas Selectivity Based on Pure Gas Permeation Measurements: An Approximate Model
title_sort	mixed-gas selectivity based on pure gas permeation measurements: an approximate model
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1988ba3886b84cfb9c1c576d5f558b93
work_keys_str_mv	AT alexanderomalakhov mixedgasselectivitybasedonpuregaspermeationmeasurementsanapproximatemodel AT vladimirvvolkov mixedgasselectivitybasedonpuregaspermeationmeasurementsanapproximatemodel
_version_	1718411305176530944

Mixed-Gas Selectivity Based on Pure Gas Permeation Measurements: An Approximate Model

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