Page 264 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

254

¥
j mm Pall ring
I 3 x i y^ r^ am m
flB
I* -tJ T 1 |
m
u 1
Plastic packings
120 / BSmm
f htortoenzene / •/ 1, / Hiflow
llQ O 6thylbenzene / / ring
0.7 mbar,
I d .=0.2, H=1.5m f J 1001/nf
I Z N
1/
I .60 SSmmRallnr /
\
i \
a 5 40 /
I j y
I 20 NorPacn«s
4S40B1/if
1
* ssp^-T "

10 U IB 2.Z 2.6 3.0 3.4 IB
3 m
Gas capacity factor F B, (m/s)(kg/m )
Fig. 41. Performance data for plastic Hiflow and 25 mm Nor Pae packings compared with plastic
25 mm Pall rings in distillation of chlorobenzene/ethilbenzene at total reflux.

ammonia-air / water
1 bar (= 14.5 psia), 2i3 K (= 88 F)
0.7
i
i mm Pall-Ring, mate! |— •f - -
0.5 L -"~ ""
^ ^ V
6 0.4
§ 0,3
Raschig Super-Ring No. 2, meta I
^ 0.2
Uquid load
z
3
10 m /{m h)
0.1 i i
0.5 1.0 2.0 3.0 5.0
Gas capacity factor F r, Pa 05

Fig. 42. Comparison of the heights of overall gas mass transfer units versus the gas capacity
ikctor at constant liquid load for metal 50 mm Pall rings and Raschig Super Rings [321].