
Cyclic and LinearCyclic and Linear 81
If there are 4 operations indexed by 1, 2, 3 and 4 we will consider that
it is possible to by-pass some of them but not cross them. Consider for
instance the notations are: 1-feed, 2-extract, 3-desorbent, and 4-raffi nate.
We can group or bypass some steps but crossing doesn’t correspond to
acceptable solutions.
Figure 4.6 illustrates this aspect of separation technology.
Figure 4.6 shows non-crossing partitions.
4
(14) (12) (13) (24) (23)
(12)(34) (134) (124)
(123) (234)
(23)(14)
1
(34)
32
(1234)
1
Fig. 4.6 Non-crossing partitions.
It shows possible coupling of steps in cyclic operations (Athanasiadis
2005).
Observe that: ...