In membrane processes with two gas phases and a solid membrane, similar equations can be written for the case illustrated in Fig. 13.2-1b. The equilibrium relation between the solid and gas phases is given by

Equation 13.3-1

where S is the solubility of A in m^{3} (STP)/atm · m^{3} solid, as shown in Eq. (6.5-5), and H is the equilibrium relation in kg mol/m^{3} · atm. This is similar to Henry's law. The flux equations in each phase are as follows:

Equation 13.3-2

Equation 13.3-3

Equation 13.3-4

The permeability P_{M} given previously is

Equation 6.5-9

The permeability ...

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