Methods for the determination of transport parameters of gases in membranes

Nguyen, Xuan Quang; Brož, Zdeněk; Uchytil, Peter; Nguyen, Quang Trong

doi:10.1039/ft9928803553

Cited by 21 publications

(8 citation statements)

References 4 publications

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“…The density was calculated using the following equation (Equation (A7)):ρitalicmembrane=wairwair−wliq×ρliqWith ρ membrane being the membrane density (g/cm 3 ), w air and w liq being the weight of the membrane in air and FC-77 (g), respectively, and ρ liq being the density of FC-77 (g/cm 3 ). Gas permeability was measured by a “time-lag” experimental facility developed in-house using constant volume variable pressure approach for permeability and diffusion coefficients determination [51]. The facility has already been discussed elsewhere [4,52].…”

Section: Methodsmentioning

confidence: 99%

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Thermal Cross Linking of Novel Azide Modified Polymers of Intrinsic Microporosity—Effect of Distribution and the Gas Separation Performance

et al. 2019

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The synthesis of polymers of intrinsic microporosity (PIM) modified with azide groups, the cross linkage by nitrene reaction and their performance as gas separation membranes are reported. The azide modification of the spirobisindane units in the polymer backbone was done by post functionalization of methylated spirobisindane containing polymers. These polymers differ in distribution and concentration of the azide group containing spirobisindane units by applying perfectly alternating and randomly distributed copolymers along the polymer chains. To investigate the influence of concentration of the azide groups, additionally the homopolymer of methylated spirobisindane was synthesized and subjected to identical treatments and characterizations as both copolymers. Cross linkage by nitrene reaction was examined by different temperature treatments at 150, 200, 250 and 300 °C. Characterization of the new polymers was performed by NMR, SEC and FT-IR. Furthermore, the crosslinking process was investigated by means of solid state NMR, TGA-FTIR, DSC and isoconversional kinetic analysis performed with TGA. Gas permeability of CO2, N2, CH4, H2 and O2 was determined by time lag experiments and ideal selectivities for several gas pairs were calculated. The two azide groups per repeating unit degrade during thermal treatments by release of nitrogen and form mechanically stable PIM networks, leading to an increase in gas permeability while selectivity remained nearly constant. Measured diffusivity and solubility coefficients revealed differences in the formation of free volume elements depending on distribution and concentration of the azide groups. Aging studies over about five months were performed and physical aging rates (βP) were evaluated with regard to the concentration and distribution of curable azide functionalities. Subsequently, the enhanced sieving effect during aging resulted in membrane materials that surpassed the Robeson upper bound in selected gas pairs.

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Section: Methodsmentioning

confidence: 99%

“…Gas permeability was measured by a “time-lag” experimental facility developed in-house using constant volume variable pressure approach for permeability and diffusion coefficients determination [51]. The facility has already been discussed elsewhere [4,52].…”

Section: Methodsmentioning

confidence: 99%

Thermal Cross Linking of Novel Azide Modified Polymers of Intrinsic Microporosity—Effect of Distribution and the Gas Separation Performance

et al. 2019

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“…Gas permeability characterization has been carried out by a "time-lag" experiment facility developed in-house utilizing constant volume variable pressure approach for permeability and diffusion coefficients determination [31]. The facility was already discussed elsewhere [32] and the method was just slightly adapted to the measurements of liquids as proposed by Ferguson et al.…”

Section: "Time-lag" Experimentsmentioning

confidence: 99%

Ionic liquids supported by isoporous membranes for CO2/N2 gas separation applications

Grünauer

Shishatskiy

Abetz

et al. 2015

Journal of Membrane Science

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“…In case in which the downstream chamber the pressure has a time dependent concentration the expression of eq. (2) should be corrected as Cruden and Meyyappan [16], and they show that the first correction of the time lag expression is twice in the Nguyen´s work [17], and in the linear approximation the right diffusion uncertainty that it is by a factor of 3 [18].…”

Section: Introductionmentioning

confidence: 99%

Configurational entropy calculation of poly(α-alkyl β,L-aspartate)s amorphous and crystalline films using gas permeation

Castillo

Andrio

Nava

et al. 2014

European Polymer Journal

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Registro de acceso restringido Este recurso no está disponible en acceso abierto por política de la editorial. No obstante, se puede acceder al texto completo desde la Universitat Jaume I o si el usuario cuenta con suscripción. Registre d'accés restringit Aquest recurs no està disponible en accés obert per política de l'editorial. No obstant això, es pot accedir al text complet des de la Universitat Jaume I o si l'usuari compta amb subscripció. Restricted access item This item isn't open access because of publisher's policy. The full--text version is only available from Jaume I University or if the user has a running suscription to the publisher's contents.

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Methods for the determination of transport parameters of gases in membranes

Cited by 21 publications

References 4 publications

Thermal Cross Linking of Novel Azide Modified Polymers of Intrinsic Microporosity—Effect of Distribution and the Gas Separation Performance

Thermal Cross Linking of Novel Azide Modified Polymers of Intrinsic Microporosity—Effect of Distribution and the Gas Separation Performance

Ionic liquids supported by isoporous membranes for CO2/N2 gas separation applications

Configurational entropy calculation of poly(α-alkyl β,L-aspartate)s amorphous and crystalline films using gas permeation

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