Permeation of supercritical CO2 through perfluoroelastomers

J. C. Legros, A. Mialdun, P. Strizhak, V. Shevtsova

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This study aims to investigate the one-component permeation of carbon dioxide through two commercial perfluoroelastomers, Kalrez 6375 and Kalrez 7090, in long-duration tests (more than 30 days). The permeation rate in the cells filled with supercritical CO2 (SC-CO2) at the initial pressure of about pin = 41 MPa has been analyzed by measuring the pressure decrease over time at the constant temperature of about 334 K. These measurements have revealed two distinct regimes of permeation which are separated by a local maximum at p ∼ 12.5 MPa. In the lower pressure regime, the molar flux of the permeant linearly slows down with the pressure decrease. The high-pressure regime is characterized by a pressure independent molar flux of SC-CO2 through the elastomer. Considering the solution-diffusion model of permeation, we have developed a theoretical model describing the mass transport of CO2 through the elastomer at three different time scales. Its comparison with experimental observations provides insight into the fundamental aspects determining the membrane transport properties (diffusion, sorption, permeability). Application of the results for the plane sheet model to the realistic geometry of the sealing rings is discussed.

Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalJournal of Supercritical Fluids
Volume126
DOIs
Publication statusPublished - 1 Aug 2017

Fingerprint

Permeation
elastomers
Elastomers
sealing
sorption
Fluxes
carbon dioxide
permeability
low pressure
transport properties
membranes
Carbon Dioxide
Transport properties
Sorption
rings
Carbon dioxide
Mass transfer
geometry
cells
Membranes

Keywords

  • Diffusion
  • Kalrez
  • Membrane
  • Permeability
  • Sorption
  • Supercritical carbon dioxide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

Permeation of supercritical CO2 through perfluoroelastomers. / Legros, J. C.; Mialdun, A.; Strizhak, P.; Shevtsova, V.

In: Journal of Supercritical Fluids, Vol. 126, 01.08.2017, p. 1-13.

Research output: Contribution to journalArticle

Legros, J. C. ; Mialdun, A. ; Strizhak, P. ; Shevtsova, V. / Permeation of supercritical CO2 through perfluoroelastomers. In: Journal of Supercritical Fluids. 2017 ; Vol. 126. pp. 1-13.
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