
156 Foam Fractionation: Principles and Process Design
causing internal reux (Wood and Tran, 1966; Lemlich, 1968; Stevenson etal.,
2008). This was discussed in great detail in Chapter6, together with dem-
onstrations of how the hydrodynamic theory of rising foam proposed by
Stevenson (2007) can be employed to describe such processes; thus it is not
repeated herein.
0
0.2
0.4
0.6
0.8
01
Foamate Concentration
Morgan & Wiesmann
Semi-batch
#2
Stage #1
#3
#4
FIGURE 9.6
Foamate concentration prole of a single-column semi-batch operation compared with the
multistage design in Figure 9.5.
3
rd
Stage2
nd
Stage
1
st
Stage