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studied on this unit.
After positive results had been obtained
from studies on "cold" units and a final analysis
of the construction, studies were carried out on
a two-column "hot" unit of 1200 mm diameter,
which operated on the system o-xylene - toluene
at temperatures up to 200~ and pressures up to
10 kg/cm 2. The assembly provided for operation C
30g
,-----L_ r
2
N,
%,
2# 40 Lv, ma/m.h
Fig. 3. Region of stable opera-
tion of fraetionating column
plates with S-shaped elements,
when Hp=600mm: 1) Line of
maximum allowable loads; 2)
line of minimum allowable
loads.
in a closed system with partial or total reflux, in a complete column
(with feed supply into the middle part of the column), in a stripping
column (with feed onto the upper plate) or in a concentration column
(with feed under the lower plate).
The assembly consisted of two columns of 1200 mm diameter
and of about 10 m height. For visual observation and photographing
of processes occurring on the plates, the column had observation
ports of 120 mm diameter. To study the effect of spacing between
plates, the support rings for the plates in one column were set up
with intervals of 150 ram, and in the other with intervals of 200 ram.
Therefore, in one column the plates could be set up with a spacing
between them of 150, 300 or 450 ram, and in the other, with spacing
of 200, 400 or 600 ram. For convenience in carrying out the studies,
the columns were set up in parallel, which allowed one simultaneously
to conduct an experiment in one column and to adjust plates in the other.
The assembly was provided with two reboilers having a heating
surface of 70 m 2 each and two heat exchanger-heaters with a heating
surface of 50 m 2 each. Condensation of distillate vapors was accom-
plished in two condensers with an overall cooling surface of 140 m 2 and two coolers with a cooling sur-
face of 50 iT12 each. The volume of the reflux vessel was 10 m a. To keep the feedstock in the assembly,
three vessels with capacity of about 100 m 3 were provided, and two with a volume of about 19 m 3. Aside