Page 220 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

210

300

200
1 i

I
-——
I L—*"—*""""
100
30 • Ralu-F(owNo.1 PP
r"
I
• Ralu~FlrawNo,2PP
60
6 8 10 20 40 60 80100 200 300

Fig.21. Effective surface area of the investigated plastic Ralu-Flow versus the liquid superficial
velocity.

The comparison in Fig. 22 shows that the effective surface of the plastic
packing is only with about 15% lower.
Because the effective surface area of the drops and jets trickling in the
packing free volume is practically not dependent on the packing material and
because the effect of this surface is greater in case of greater packing elements,
it is expected that the influence of the wettability of the material is greater in
case of smaller elements. In Fig. 23 a comparison of the effective surface for
metal and plastic RSR No. 6 is made. Since there are no data for metal RSR No
6, the data used in Fig. 23 are extrapolated from the data for metal RSR No 0.5
and No 0.7.

200
!_
-—'"'"1
•
100 • RSR 2
J • RSR No.2 PP
1^ ^
80
8 10 20 40 60 80 100 200 300

Fig. 22. Comparison of the effective surface of RSR No. 2 of metal and of plastic.