Study on membrane performance in vapor permeation of VOC/N2 mixtures via modified constant volume/variable pressure method

Yang, Wenxuan; Zhou, Haoli; Zong, Chuanxin; Li, Yuxue; Jin, Wanqin

doi:10.1016/j.seppur.2018.02.044

Cited by 45 publications

(28 citation statements)

References 35 publications

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“…In this situation d 1 = 0 and Equation (37) reduces to the quadratic equation with the familiar result for the permeate composition [27]. Using the definition (19), the SF for a binary gas mixture with no coupling is given by…”

Section: Separation Factormentioning

confidence: 99%

“…Permeate composition is calculated using Equation (37) with the expression (49) for the Peclét number. The relationship of permeate composition with the SF is given by Equation (19). Penetrant fluxes are then calculated using Equations ( 31) and (32) or, equivalently, via the expressions (42).…”

Section: Explicit Form Of the Peclét Numbermentioning

confidence: 99%

“…It should be particularly emphasized that mixed-gas measurements need to modify and improve conventional and widely used experimental techniques [18,19]. Another problem is related to the accurate measurement of gas mixture sorption in polymer materials.…”

Section: Introductionmentioning

confidence: 99%

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

Малахов

Volkov

2021

Membranes

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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 n-butane/methane and propylene/propane through polymeric membranes.

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Section: Separation Factormentioning

confidence: 99%

Section: Explicit Form Of the Peclét Numbermentioning

confidence: 99%

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

Малахов

Volkov

2021

Membranes

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“…Their emissions have adverse effects on human health, such as dry cough, dizziness, headache, and cancer [ 3 , 4 ]. Therefore, researchers have made great efforts to investigate different technologies for VOC abatement, including adsorption [ 5 ], membrane separation [ 6 ], thermal combustion [ 7 ], photocatalysis [ 8 ], and catalytic oxidation [ 9 ]. However, traditional VOC control methods have technical and economic limitations, especially for the treatment of low concentrations of VOCs.…”

Section: Introductionmentioning

confidence: 99%

Performance of Toluene Removal in a Nonthermal Plasma Catalysis System over Flake-Like HZSM-5 Zeolite with Tunable Pore Size and Evaluation of Its Byproducts

Lin

et al. 2019

Nanomaterials

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In this study, a series of HZSM-5 catalysts were prepared by the chemical liquid-phase deposition method, and low concentration toluene degradation was carried out in an atmospheric pressure dielectric barrier discharge (DBD) reactor. The catalysts were characterized by X-ray powder diffraction (XRD), SEM, TEM, and N2 adsorption analysis techniques. In addition, several organic contaminants were used to evaluate the adsorption performance of the prepared catalysts, and the effect of pore size on the removal efficiency of toluene and byproduct formation was also investigated. The unmodified HZSM-5 zeolite (Z0) exhibited good performance in toluene removal and CO2 selectivity due to the diffusion resistance of ozone and the amounts of active species (OH• and O•). Meanwhile, the time of flight mass spectrometry (TOF-MS) result showed that there were more byproducts of the benzene ring in the gas phase under the action of small micropore size catalysts. Moreover, the surface byproducts were detected by gas chromatography–mass spectrometry (GC-MS).

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“…They contribute both indirectly as ozone/ smog precursors and directly as substances toxic to the health, causing cancer, failure of the livers and kidneys, and respiratory diseases [1][2][3][4]. In recent years, efficient removal of VOC gases techniques were considered, including condensation, catalysis oxidation [5], membrane separation [6], adsorption and biological degradation [7], among which adsorption is recognised as one of the most advanced and potential control methods since it is low-cost, recyclable and capable of eliminating a variety of gaseous pollutants and a selective and efficient adsorbent is a critical factor to achieve desired VOCs removal efficiency [8,9]. Applying aerogel for VOCs adsorbent turned out to be significantly attractive due to their relatively high specific surface area, lowdensity (typically <0.2 g cm −3 ) and high-porosity (>90% v/v) [10].…”

mentioning

confidence: 99%

Synthetic mechanisms of K _{2−
x} Mn ₈ O ₁₆ nanorods for removal of acetaldehyde

Chen

Shi

Liang

2019

Micro & Nano Letters

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Volatile organic compounds (VOCs) severely threaten the ecological environment and human health even at low concentration because most of them are toxic, mutagenic and carcinogenic. In this study, a hydrothermal synthetic manganese-based compound, namely cryptomelane manganese oxide (K 2−x Mn 8 O 16) nanorod aerogels and a redox product of K 2 S 2 O 8 and MnSO 4 , is chosen as an adsorbent for acetaldehyde removal. Insights were gained into the functions of potassium sulphate (K 2 SO 4) and the mechanisms of generating nanorods in the solution phase. The structures, morphologies, specific area and pore size distribution of composites were characterised by N 2 adsorptiondesorption isotherms, scanning electron microscopy, and X-ray diffraction, and the results showed that VOCs removal by adsorption onto K 2−x Mn 8 O 16 nanorod aerogels could be used as a potential method for eliminating VOCs in terms of efficiency.

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Study on membrane performance in vapor permeation of VOC/N2 mixtures via modified constant volume/variable pressure method

Cited by 45 publications

References 35 publications

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

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

Performance of Toluene Removal in a Nonthermal Plasma Catalysis System over Flake-Like HZSM-5 Zeolite with Tunable Pore Size and Evaluation of Its Byproducts

Synthetic mechanisms of K _{2−
x} Mn ₈ O ₁₆ nanorods for removal of acetaldehyde

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Study on membrane performance in vapor permeation of VOC/N2 mixtures via modified constant volume/variable pressure method

Cited by 45 publications

References 35 publications

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

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

Performance of Toluene Removal in a Nonthermal Plasma Catalysis System over Flake-Like HZSM-5 Zeolite with Tunable Pore Size and Evaluation of Its Byproducts

Synthetic mechanisms of K 2− x Mn 8 O 16 nanorods for removal of acetaldehyde

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Product

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Synthetic mechanisms of K _{2−
x} Mn ₈ O ₁₆ nanorods for removal of acetaldehyde