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4.2 Design of Adsorption and Ion-Exchange Processes 313
1
0.8
0.6
o
C/C
0.4
La = 0.6
0.2 La = 0.2
0
-10 -5 0 5 10
N s (T-1)
Figure 4.23 Solid diffusion control model for La = 0.2 and 0.6.
1
0.8
0.6
o
C/C
0.4
Ns(T-1)
0.2 Nf(T-1)
0
-8 -3 2 7
N(T-1)
Figure 4.24 Solid and film diffusion control models for La = 0.5.
From Figure 4.24, it is clear that in the case of liquid-film control, the curve has a tail
ginning, in the be while in the case of solid dif the tail is at the end. fusion control,
,
Finally two models based on nonlinear driving forces will be presented. The first
one covers the case of a pore diffusion control and the second one the case of solid
diffusion control. Both models hold for the Langmuir-type isotherm. For the case of
