Improving gas separation properties of polymeric membranes based on glassy polymers by gas phase fluorination

Сырцова, Д. А.; Kharitonov, A. P.; Teplyakov, V. V.; Koops, G.H.

doi:10.1016/s0011-9164(04)90200-7

Cited by 55 publications

(27 citation statements)

References 9 publications

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“…In addition, the CO 2 /N 2 and CO 2 /CH 4 single gas selectivities measured in this work are closer or, in such cases, higher than those of other literature works, except for the Matrimid 5218 membranes prepared by Syrtsova et al (2004), which exhibited a significantly higher selectivity because the gas separation properties were improved by gas phase fluorination. It has to be highlighted that there are significant differences between the transport properties measured on a single fiber, as in most of the cases reported in Table 4, and that measured with a hollow fiber module, as in this work.…”

Section: Gas Transport Through the Membranessupporting

confidence: 61%

Polyimide hollow fiber membranes for CO2 separation from wet gas mixtures

Falbo

Tasselli

Brunetti

et al. 2014

Braz. J. Chem. Eng.

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-Matrimid®5218 hollow fiber membranes were prepared using the dry-wet spinning process. The transport properties were measured with pure gases (H 2 , CO 2 , N 2 , CH 4 and O 2 ) and with a mixture (30% CO 2 and 70% N 2 ) in dry and wet conditions at 25 °C, 50 °C, 60 °C and 75 °C and up to 600 kPa. Interesting values of single gas selectivity up to 60 °C (between 31 and 28 for CO 2 /N 2 and between 33 and 30 for CO 2 /CH 4 ) in dry condition were obtained. The separation factor measured for the mixture was 20% lower compared to the single gas selectivity, in the whole temperature range analyzed. In saturation conditions the data showed that water influences the performance of the membranes, inducing a reduction of the permeance of all gases. Moreover, the presence of water caused a decrease of single gas selectivity and separation factor, although not so significant, highlighting the very high water resistance of hollow fiber membrane modules.

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Section: Gas Transport Through the Membranessupporting

confidence: 61%

Polyimide hollow fiber membranes for CO2 separation from wet gas mixtures

Falbo

Tasselli

Brunetti

et al. 2014

Braz. J. Chem. Eng.

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“…11 and 12 [79,80]. Fluorination of hollow fiber polyimide membrane modules results in a significant (by a factor of 47 and 7, respectively) increase of selectivity for the separation of He/CH 4 and CO 2 / CH 4 mixtures.…”

Section: Membrane Technologiesmentioning

confidence: 99%

Modification of surface properties of carbon-based and polymeric materials through fluorination routes: From fundamental research to industrial applications

Tressaud

Durand²,

Labrugère³

et al. 2007

Journal of Fluorine Chemistry

177

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The outstanding characteristics of fluorine gas, e.g., extreme reactivity and oxidizing power, and the utmost electronegativity of F À ion, lead to very strong bonds between fluorine and most of the other elements of the periodical table. Treatments involving F 2 , fluorinated gases and rf plasmaenhanced fluorination (PEF) constitute exceptional tools for modifying the surface properties of materials. Many advantages of these techniques can be indeed outlined, when compared to more conventional methods: low-temperature reactions (even at room temperature), chemical modifications limited to surface only without changing the bulk properties, possible non-equilibrium reactions. Depending on the type of starting materials and employed techniques, the improved properties may concern wettability, adhesion, chemical stability, barrier properties, biocompatibility, grafting, mechanical behavior. Several examples of surface fluorination will be given on various types of carbon-based materials, elastomers and polymers. #

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“…Therefore it is necessary to increase polymer selectivity keeping good film-formation properties, high mechanical characteristics and permeability for effective separation of such gas mixtures as Н 2 /СО 2 , Не/СО 2 and Не/СО 2 /CH 4 . This purpose can be achieved, for example, by fluorination of membrane [77].…”

Section: Commercially Available Polymers and Membrane Modulesmentioning

confidence: 99%