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

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17.4.2 Determination of Membrane Properties from Experiments

Experimental values of xp and xout can be used to determine α′ and M. First, an experiment is done in a very well mixed cell under conditions where there is no concentration polarization. Solving Eq. (17-19) for the selectivity, we obtain

Image

(17-27)

where under the conditions of the experiment M = 1 and all other terms on the right-hand side are known. This method is illustrated in Example 17-4.

Example 17-4. Determination of RO membrane properties

We test a new composite membrane. Both experiments were done with a retentate pressure of 15.0 atm and a permeate pressure of 1.0 atm. The ...

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