An experimental study was made of the permeation of water, paradioxane, and water-paradioxane mixtures through nylon 6 membranes. Laminated films were utilized to determine actual liquid permeate concentration profiles within the membrane structure. Knowledge of these profiles permitted the investigators to measure the concentration-dependent diffusivities and to characterize the mechanism of mass transfer. Since water plasticizes nylon, the behavior of the water-dioxane mixture could not be accurately predicted from pure component performance. Thus the transfer of water was enhanced and the dioxane depressed for equimolar feed mixtures. Moreover, it was demonstrated that a simple, acid surface-treatment of the separative membrane can greatly enhance the transfer of both components. Concentration profiles measured during the unsteady state leading to equilibrium suggested that the nylon polymer matrix was in the process of undergoing structural changes.
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Tock et al. (1974) studied this question.
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