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

Малахов, А. О.; Volkov, V. V.

doi:10.3390/membranes11110833

Cited by 6 publications

(5 citation statements)

References 35 publications

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“…D CO 2 * represents the local diffusivity of the CO 2 component under the presence of intermolecular friction with CH 4 and C 2 H 6 . It can be derived from the pure component diffusivity ( D CO 2 ) and the exchange diffusivity ( D ij ) using eq . , 1 D CO 2 * = 1 D CO 2 + θ CH 4 D CO 2 − CH 4 + θ C 2 H 6 D CO 2 − C 2 H 6 D CO 2 − j = D CO 2 θ CO 2 / false( θ normalCO <...…”

Section: Resultsmentioning

confidence: 99%

“…D CO 2 * represents the local diffusivity of the CO 2 component under the presence of intermolecular friction with CH 4 and C 2 H 6 . It can be derived from the pure component diffusivity ( D CO 2 ) and the exchange diffusivity ( D ij ) using eq . , The factor a was the correction factor by considering the competitive adsorption, which can be estimated by the following equation. …”

Section: Resultsmentioning

confidence: 99%

“…D COd 2 * represents the local diffusivity of the CO 2 component under the presence of intermolecular friction with CH 4 and C 2 H 6 . It can be derived from the pure component diffusivity (D COd 2) and the exchange diffusivity (D ij ) using eq 9 47,48.…”

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confidence: 99%

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Effect of Light Gas Components on CO₂ Permeation through DD3R Membranes

Song

Peng

You

et al. 2022

Ind. Eng. Chem. Res.

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Membrane technology has emerged to be a promising alternative for natural gas upgrading. Zeolite membranes are attracting more and more attention because of the hydrothermal and chemical stability. However, the zeolite membranes are generally evaluated in the unary or binary CO2/CH4 components, which is far from the real applications. Herein we investigated the CO2 permeation through DD3R zeolite membranes under the presence of light gas components (e.g., N2, CH4, C2H6, and SF6). The CO2 diffusivity was calculated by the generalized Maxwell-Stefan model for more insights on CO2 transport. The diffusion of CO2 molecules was slightly affected by the presence of N2, CH4, and SF6. However, the CO2 diffusivity in equimolar CO2/C2H6 was one magnitude lower than that of pure CO2 component because of the strong competitive adsorption and slow diffusion of C2H6 molecules. An empirical formula was proposed to predict the CO2 diffusivity in the CO2/CH4/C2H6 ternary mixture. The predicted CO2 flux matched well with the experimental one for the mixture containing less than 15 mol % C2H6. This would provide a facile method to determine the required membrane area for multicomponent mixture separation.

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Section: Resultsmentioning

confidence: 99%

“…D CO 2 * represents the local diffusivity of the CO 2 component under the presence of intermolecular friction with CH 4 and C 2 H 6 . It can be derived from the pure component diffusivity ( D CO 2 ) and the exchange diffusivity ( D ij ) using eq . , The factor a was the correction factor by considering the competitive adsorption, which can be estimated by the following equation. …”

Section: Resultsmentioning

confidence: 99%

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Effect of Light Gas Components on CO₂ Permeation through DD3R Membranes

Song

Peng

You

et al. 2022

Ind. Eng. Chem. Res.

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“…Gas selectivity in a mixture can differ from the ideal gas selectivity calculated based on individual gas permeabilities. 105 Like temperature, humidity plays a significant role in the permeability of gases, including vapor itself. 106,107 While the pressure effect on permeability is generally negligible in the typical pressure range in microfluidics.…”

Section: Basic Transport Mechanisms Through Gpmsmentioning

confidence: 99%

Gas transport mechanisms through gas-permeable membranes in microfluidics: A perspective

Seo,

Kim

2023

Biomicrofluidics

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Gas-permeable membranes (GPMs) and membrane-like micro-/nanostructures offer precise control over the transport of liquids, gases, and small molecules on microchips, which has led to the possibility of diverse applications, such as gas sensors, solution concentrators, and mixture separators. With the escalating demand for GPMs in microfluidics, this Perspective article aims to comprehensively categorize the transport mechanisms of gases through GPMs based on the penetrant type and the transport direction. We also provide a comprehensive review of recent advancements in GPM-integrated microfluidic devices, provide an overview of the fundamental mechanisms underlying gas transport through GPMs, and present future perspectives on the integration of GPMs in microfluidics. Furthermore, we address the current challenges associated with GPMs and GPM-integrated microfluidic devices, taking into consideration the intrinsic material properties and capabilities of GPMs. By tackling these challenges head-on, we believe that our perspectives can catalyze innovative advancements and help meet the evolving demands of microfluidic applications.

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“…In [17], an approximate model based on friction-coefficient formalism was developed to predict the mixed-gas permeability and selectivity of polymeric membranes. More specifically, the model is a modification of Ora Kedem's approach to flux coupling.…”

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confidence: 99%