Page 264 - Distillation theory

P1: JPJ/FFX P2: JMT/FFX QC: FCH/FFX T1: FCH
0521820928c07 CB644-Petlyuk-v1 June 11, 2004 20:18

x D
2
a)
x F
x B

x f−1
x f 4
1
13 s S ( 2 ) α
3

1
s S
2,4
b)
α 23
α 13
α 23
α 13
sh f x 1, + sh
min f x 3,
) 1 ( + f x + ) 2 (
s N s N
∞
∞ f x ( 2 α
x f ,lin s S )
1 3
α 23
13
Figure 7.9. (a) Section trajectories at quasisharp in-
termediate split for the equimolar acetone(1)-benzene
(2)-chloroform(3)-toluene(4) mixture (L/V = 0.778,
sh
x f −1 = x ∞ + 0.5 x f −1 , products purity – 0.99), sepa-
f −1
2,4 1,3
ratrix sharp split section regions Reg R and Reg R sep,s
sep,r
1,3 2,4
are shaded, (b) stripping bundle a different x B,1 (natural
projection to edge 2-4) illustrating that the bundle con-
2(α)
tain the saddle point S s on α 13 -surface if (L/V) s < K 1
+(2)
and K 3 > K 1 in point N s on face 2-3-4. Working part
1 2(α) +(1)
of stripping separatrix sharp bundle S − S s − N s ∈
s
1,3
Reg R is shaded.
sep,s
2,4
N
75
tot
65
55
45
rec
35
str ∞
x − x
−1
25 f min f − lin,1 ∞
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 x f − ,1 lin − x f − lin,1
Figure 7.10. Number of trays in each column section and whole column
at quasisharp intermediate split for the equimolar acetone(1)-benzene(2)-
chloroform(3)-toluene(4) mixture for different x f −1 (L/V = 0.778, products
purity – 0.99).

238