Page 154 - Distillation theory

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

128 Distillation Trajectories and Conditions of Mixture Separability

K 2
a)

x
0 min x t 1 2
2
2
b)

min K 2

1 3

x D
2
S 4
c)
x F
S 3
x B
S
2
(L V) 4 = 1
min x t S 1 (L V)
2 3
(L V)
(L V) 2
x D 1
1 + + + 3
N N N 3
− 1 2 +
N N 4
Figure 5.12. The evolution of trajectory bundle of the rec-
2,3
1
tifying section (Reg R w,s ≡ Reg ) for an mixture with K 1 >
att
1
K 2 > K 3 (component 1 is the product) with the tangential
pinch region Reg tang (not shaded): (a) the function K 2 (x 2 )
withminimumonside1-2,(b)theisolines K 2 (x 1 , x 2 , x 3 )with
minimum on triangle 1-2-3, (c) changes in the location of
the separatrix as a function of L/V((L/V) 4 = 1, (L/V) 4 >
t
(L/V) 3 > (L/V) 2 > (L/V) 1 ), S 1 = min x .
2