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4.2 Design of Adsorption and Ion-Exchange Processes 345

100

80
60

(ppm)
40
out
C
20 Helfferich
Perry
0
0 200 400 600
V eff (m 3 )
Figure 4.37 Comparison of LDF and Helfferich models for Q 5 BV/h.
rel

25

20

15

10

5
% difference
0
0 50 100 150
-5
C out (ppm)
Figure 4.38 The difference (%) of LDF and Helfersus the exit concentration. s model v ferich’

(eq. (4.191)) takes into account the resistance in the liquid film and thus the character-
istic tail at the beginning of the breakthrough curve is apparent.

The utilization of the fixed bed : The value of z for X 0.1 is 151.68 (eq. (4.191)).
A
Then, by using eq. (4.199) and for Q 5 BV/h, the breakpoint loading of the solid
rel
phase is
 z A 
q br q o   1 Z   70.11 mg/g