Abstract
The main topics of this chapter are solution/diffusion component transport, focusing on the two determining parameters in this model, namely the solubility coefficient, and the diffusion coefficient. The most commonly used expressions for prediction of the diffusion coefficient for both gas and liquid components and the common solubility isotherms (Henry's law, the Flory–Huggins model, and dual-mode sorption) are listed in the chapter. Briefly, both diffusive mass transport equations through dense membranes and transport through porous membranes are mentioned, citing other chapters dealing with them in detail. The most recommended methods for determination of the diffusion coefficient by measurements, namely using time lag, are also discussed. Special cases of the values of time lag (constant diffusion coefficient, linearly concentration-dependent diffusion coefficient, two-layer composite membrane, and dual-mode sorption) are given with the solution of the nonsteady-state differential balance equations (Fick's second law). The mass flow of porous membranes is also mentioned (Knudsen diffusion, viscous flows, and certain combinations of them), but its detailed discussion is handled in Chapter 3. The convective velocity of phases, due to the components' diffusion, is given at the end of the chapter.
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