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

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12.6 McCabe-Thiele Analysis for More Concentrated Systems

If absorption or stripping can be assumed 1) to be isothermal and 2) to have negligible heat of absorption, then the energy balances will be satisfied. In this case the McCabe-Thiele analysis procedure can be adapted to more concentrated systems where the total flow rates L and V are not constant. We will have the desired straight operating line if we define

Image

and if we also assume that:

3. Solvent is nonvolatile

4. Carrier gas is insoluble

Assumptions 3 and 4 are often closely satisfied. The results of these last two assumptions are that the mass balance for solvent becomes

(12-37a)

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