A Laboratory for Gaseous Diffusion Through Permeable Solids: The Time Lag

Authors

  • Olivier Dufaud Ecole Nationale Superieure des Industries Chimiques
  • Eric Favre Ecole Nationale Superieure des Industries Chimiques
  • L.M. Vincent LSGC-CNRS

Abstract

A simple laboratory setup dedicated to the study of transitory gas transfer through permeable solids in a flat design (polymer films, metal or ceramic porous supports, catalysts, adsorbents) is described. An illustrative application for oxygen and nitrogen transport through an elastomer matrix (Silastic) is presented. Data treatment, performed according to the time-lag technique, leads to the sorption and diffusion coefficients of the gas through the solid, as well as to the overall permeability. Based on these aspects, a didactic tutorial for an undergraduate laboratory is proposed.

Author Biographies

Olivier Dufaud, Ecole Nationale Superieure des Industries Chimiques

O. Dufaud received his Master's Degree in Chemical Engineering at ENSIC Nancy (France) and is now a PhD student in the field of stereophotolithography.

Eric Favre, Ecole Nationale Superieure des Industries Chimiques

E. Favre is a professor of chemical engineering at ENSIC Nancy (France). His major interests in research are mass transfer and membrane separations.

L.M. Vincent, LSGC-CNRS

L.M. Vincent is a research engineer at LSGC-CNRS in data acquisition and electronic applications.

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Published

2000-04-01

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Manuscripts