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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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17.3.2 Binary Permeation in Perfectly Mixed Systems

The mass balances for a gas permeation membrane module that is completely mixed on both sides of the membrane will have the simplest form since the mole fracs and pressures on each side of the membrane are constant. Equations (17-2) and (17-3b) can then be used in algebraic mass balances with yp = yt and integration is not required to find the average retentate and permeate mole fracs.

We can obtain a rate transfer (RT) equation for a perfectly mixed permeator by writing the equation for transfer through the membrane, Eq. (17-2) for both the more permeable and the less permeable species. The perfectly mixed assumption makes yp = yt. We will also assume that the module has a high rate of mass ...

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