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

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12.1 Absorption and Stripping Equilibria

For absorption and stripping in three component systems we often assume that

1. Carrier gas is insoluble.

2. Solvent is nonvolatile.

3. The system is isothermal and isobaric.

The Gibbs phase rule is

F = C − P + 2 = 3(A, B, and C) − 2(vapor and liquid) + 2 = 3

If we set T and p constant, there is one remaining degree of freedom. The equilibrium data are usually represented either by plotting solute composition in vapor vs. solute composition in liquid or by giving a Henry’s law constant. Henry’s law for dilute solute B is

Image

(12-1)

where HB is Henry’s law constant, in atm/mole frac, H = H(p, T, composition); ...

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