Page 332 - Distillation theory

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306 Synthesis of Separation Flowsheets

2 2

4 4
2 1,2 2 1,2
1,2,4,5 1,2,4 1,2,5
a) 1 b)
1,3
1 1

1,2,3,4,5 1,3 1,3
1,2,4,5 1,2,4 1,2,5
1,2,3,4,5

1,2
5 3 5 3
1,3
1,2,3,5

4 2

2 4
2
4 1,2
1,4
1,4,5 1,2,5
c) d)
1 1
3,5 3,5

1,2,3,4,5 1,3 1,2,3,4,5 1,3
1,4,5 1,2,5

3
5 5 3
1,3 1,3
1,3,4,5 1,2,3,5
Figure 8.24. Sequences for distillation of the water(1)-methanol(2)-acetic acid(3)-acetone(4)-
pyridine(5) mixture, obtained by means of automatic sequencing.

can be separated by means of distillation in the simple third column with pre-
5 1,4
liminary recycle of component 4 at split 1,4 : 5 (there are Reg D and Reg B [Fig.
1,4 5
8.13f].)
As a result, we have four best sequences of five-component mixture in four
columns (Fig. 8.24). Each sequence contains one autoextractive column with two
feed flows, one autoextractive column with one feed flow (with preliminary recycle),
one simple column with one distributed component, and one complex column with
two feeds and one side product. Such a set of columns is a consequence of the
structure of phase equilibrium coefficients field in concentration pentahedron, (only