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The time lag permeation technique has proven to bean effective method for characterisation. Because of the simple nature of the permeation experiment, transport parameters can be directly obtained from experimental data hence avoiding the intensive mathematical treatment required by other techniques. The method has historically been applied to diffusion and adsorption in porous membranes and diffusion...
Time lag permeation experiments have been traditionally conducted with weakly adsorbing species or at low upstream concentrations, in order to simplify the asymptotic solution of the mass balance equations. In this paper, the solution is obtained for the case of non-linear adsorption according to the Freundlich and Langmuir isotherms and concentration dependent surface diffusion described by the...
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