Page 121 - Distillation theory

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

4.5 Trajectories Bundles of Reversible Distillation for Multicomponent Mixtures 95

in the top product is the heaviest, is a region of the trajectories tear-off of the top
section Reg t , and the region of reversible distillation Reg 4 contains one trajec-
rev,r rev,r
tory bundle and fills up the whole concentration tetrahedron. In face 2-3-4, there
is the region of the trajectories tear-off of the bottom section Reg t between the
rev,s
α 13 -line and side 2-4, where the component 1 that is absent in the bottom product
is the lightest. Product points can be located only in faces where one can find the
trajectories tear-off regions, (i.e., in face 1-2-3 for the top product and in face 2-3-4
for the bottom product). The contour of possible product regions Reg and Reg B
D
in these faces consists of the segments at their sides. These segments are possible
product composition segments at separation of three-component mixtures formed
by the components of the side under consideration and by the component, which
is absent in the face under consideration (for face 2-3-4, it is component 1). These
segments are shown in Fig. 4.15a ÷ c for face 2-3-4. In face 2-3-4, the whole side
2-4 and segments at edges 2-3 and 4-3 that are adjacent to vertexes 2 and 4 are such
segments. Corresponding to it possible bottom product composition region Reg 1
B
2,3,4

Figure 4.15. Segments of possible bottom composition Reg B (thick solid
lines) on the sides of face 2-3-4 of the acetone(1)-benzene(2)-chloroform(3)-
1
1
toluene(4) concentration tetrahedron: (a) Reg (side 2-3); (b) Reg (side 2-4);
B B
2,3 2,4
1
(c) Reg (side 3-4); and (d) region of possible bottom of reversible distillation
B
3,4
1
Reg on the face 1-2-3 (shaded).
B
2,3,4