Page 269 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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Table 25. Some pirametera for different arranged packings
3
2
Type of packing Material Size mm a, m /m 3 e»m /m 3 c p
Pall ring, stacked Ceramic 50 155.2 0.754 0.233
Hiflow ring, stacked Plastic 50 131.3 0.916 0.172
50, hydr. 140.1 0.911 0.172
Impulse packing Ceramic 100 96.7 0.828 0.417
Abbrev.: hydr.=hydropMlKed

Fig. 47 presents a block of honeycomb packing pressed of
polypropylene, investigated in [60, 61].
A honeycomb packing can also be assembled of thermo-pressed plates,
as presented in Fig. 48. Using plates of sintered plastics, for example sintered
PVC, it is possible to obtain a packing able to operate at very low liquid
superficial velocity with practically fully wetted packing surface area [62-64,
145-147].

Fig. 47. Honeycomb block packing of polypropylene.