Page 146 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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To prevent the condensation of vapours in the impulse lines connecting
the column with the manometers, respectively the differential manometer, small
coolers are used. The electric reboiler ensures evaporation of the liquid and
obtaining of vapour. The vapour flow rate is regulated by the consumed electric
power. Cooled samples are taken from the bottom and the top of the column.
Mixing the reflux after the reflux condenser with the liquid from the
column bottom, it is possible to carry out the experiment without using a big
tank. The rotameters after the pump and the corresponding valves give the
possibility to regulate the flow rate of the inlet liquid in the distributor and also
the composition of the reboiler inlet For this type of installation the liquid
phase distributor can be simple perforated-pipe distributor, Fig. 18, capillary
distributor, Fig. 19, profiled-slot distributor, Fig. 20, and other devices. The
distributor presented in Fig. 5 used for cold stand investigations is also proper
for hot stand if there is a need of liquid superficial velocity changing in a wide
range.

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I '
a
d c=450 mm N s=7301 /m
d =300 mm N=13501/m a

d=220mm N=21501/m 2

Fig, 18, Perforated-pipe distributor for pilot columns [86].