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An experimental method was proposed to determine the single concentration profile of permeant in a membrane under pervaporation. In this method, two individual experimental data were required. One was the relationship between the downstream pressure and the steady-state flux, and the other was the adsorption isotherm of the permeant to the membrane. According to this method, it was possible to evaluate the precise concentration profile and to be applied to the system that the permeant is easy to vaporize. By applying this method to the pervaporation of water or ethanol, the concentration profiles in the membrane were determined. They showed good agreement in shape with previous results obtained by conventional methods. Assumptions required for this method were examined experimentally, and these were valid for the permeant-membrane systems treated in this study.

Concentration profiles of permeant in membranes under pervaporation. A proposal of a new method to determine the profiles.