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Improving PVDF hollow fiber membranes for CO₂ gas capture

Medina-Gonzalez, Yaocihuatl and Tournadre-Lasseuguette, Elsa and Rouch, Jean-Christophe and Remigy, Jean-Christophe Improving PVDF hollow fiber membranes for CO₂ gas capture. (2012) Separation Science and Technology, 47 (11). 1596-1605. ISSN 0149-6395

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Official URL: http://dx.doi.org/10.1080/01496395.2012.658942


Poly(vinylidene fluoride) (PVDF) hollow fiber membranes were obtained by the phase inversion technique. The influence of internal coagulant viscosity (0.001 to 3 Pa s) and air gap (0.6 to 86.4 cm) on the structure and mechanical resistance of the fibers was studied. A "sponge-like" structure free of macrovoids was obtained by using polyvinyl alcohol (PVA) with N-methyl pyrrolidinone and water as internal coagulant (viscosity 3 Pa s). The effect of the air-gap was studied in order to control the structure and obtain mechanically resistant membranes with tensile strength at break between 2.2 and 54.3 N/mm² and pure water permeability ranging from 4 to 199 Lh-¹m-²bar-¹. CO₂ permeability of these membranes was measured and found to be in the range of 365 to 53200 NLh-¹m-²bar-¹. The "Dusty Gas" model (DGM) was used to calculate the pore size of the membranes from CO₂ permeability experiments, obtaining pore radius values going from 0.6 to 10.8 lm. Results from modeling were compared with pore sizes observed in SEM images showing that this model can accurately predict pore radius of sponge-like structures; however, pore sizes of membranes presenting sponge-like structures together with finger-like pores were inaccurately predicted by the DGM.

Item Type:Article
HAL Id:hal-03468490
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Deposited On:06 Nov 2013 09:00

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