Page 130 - Distillation theory

P1: FCH/FFX P2: FCH/FFX QC: FCH/FFX T1: FCH
0521832772c04 CB644-Petlyuk-v1 June 11, 2004 17:49

104 Trajectories of Thermodynamically Reversible Distillation

2

α x max
23 B3
best
x B
x branch
rev
α
13

1 3
α 23
13
Figure 4.24. Boundary of semisharp reversible distilla-
tion region (shaded) of acetone(1)-benzene(2)-chloro-
form(3) mixture; x best ∈ Reg 1,bound .
B rev,B

The location of semisharp reversible distillation boundaries for three-
component mixtures was investigated in the works (Petlyuk et al., 1981b; Poell-
mann & Blass, 1994). The simplest way to define the location of point x best for a
B
given feed point x F consists of the conduction of a series of trial calculations of
reversible distillation trajectories for different points x B at the straight line pass-
ing through the liquid–vapor tie-line of the feeding. For the points x B to the left
of boundary of semisharp reversible distillation, the node is vertex 1 and for the
points to the right it is vertex 3.

2

α 23

Figure 4.25. Boundary of semisharp re-
x B
versible distillation region (shaded) of
acetone(1)-benzene(2)-chloroform(3)-
x branch 1,bound
rev
toluene mixture; x best ∈ Reg .
B rev,B
1 4
α 23 α 13
13

3