Page 220 - Distillation theory

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194 Distillation Trajectories in Infinite Complex Columns and Complexes

K
i
10
a) 9
8
7
6
5
4 1
3 α 13
2 3
1
2
0 x 1
0 0.2 0.4 0.6 0.8 1

x '
D 1
15
b)
K = 1 K = 1
3
3
10
5
0 x t
1
0.2 0.4 0.6 0.8
-5
-10
-15

c) E/D
15
10
(E/D ) min
5
t
0 x
1
0.2 0.4 0.6 0.8
-5
-10
-15
Figure 6.11. About calculation minimum entrainer flow rate
(E/D) min . K i , x and E/D as functions x t (a,b,c, respec-
D,1 e,1
tively) for extractive distillation of the acetone(1)-water(2)-
methanol(3) azeotropic mixture. x t = x t concentration of
e,1 rev,e
component 1 in tear-off point of intermediate section reversible
distillation trajectory on side 1-2; K i , phase equilibrium coeffi-
t
cient of component i in point x , x and E/D, concentration
e,1 D,1
of component 1 in pseudoproduct point and ratio of entrainer
and overhead flow rates, respectively, if tear-off point of inter-
mediate section trajectory x t on side 1–2 coincide with point
e,1
S m,1 .