Page 170 - Distillation theory

P1: JPJ/FFX P2: FCH/FFX QC: FCH/FFX T1: FCH
0521820928c05 CB644-Petlyuk-v1 June 11, 2004 20:15

144 Distillation Trajectories and Conditions of Mixture Separability

2
a)

x D
+
N
1 4
x t
rev Figure 5.25. The evolution of separatrix tra-
jectory bundle and separatrix sharp split re-
4
1
+
3 gion S → N ≡ Reg sh,R of the rectifying sec-
sep,r
1,2,3
tion for an ideal mixture with K 1 > K 2 > K 3 >
2 K 4 (mixture 1,2,3 is the product): (a) L/V <
D
b) (L/V) t rev , (b) L/V > (L/V) t rev .(L/V) t rev , val-
F ues of L/V at reversible-distillation trajectoriy
tear-off point from the face 1-2-3.
B
x D
+
N
1 4
S 1

3

D
2 3 2 S 3 2
a) b) S c)
F α
23 α α
23 23
B
2 2
S S
1234 1324
x + x D + x +
D N α N D α N
1 23 4 1 4 1 23 4
− − −
N N N
S 3 (1) 3
α S (1) α α 23
23
23
3 3 S 2 3
2,3,4
Figure 5.26. The evolution of trajectory regions, Reg R ≡ Reg 1 of the rectifying section
w,r att
1
(hatched and shaded) for an mixture with α 23 surface (component 1 is the product):
1
1
1
(a) L/V > K > K > K , (b) L/V > K 2 at point α 23 on side 1-2, (c) L/V > K 2 at point α 23 on
3
4
2
3,4 2,4
t
t
side 1-3. Double line, tear-off segments Reg and Reg .
r
r
1,2 1,3