Page 166 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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where the corresponding constants depend on the form of the packing, and d p is
the nominal packing size, respectively its diameter.
Among the contemporary packings, the Raschig Supper-Ring of metal
and plastic, the metal packing IMTP, and the plastic Ralu-Flow, presented in
Figs. 6 to 8, investigated at the author's laboratory, are especially effective. The
geometrical characteristics of these packings measured by us are presented in
Table 2.
It is well known that these characteristics depend on the column
diameter and are not perfectly reproducible. That is why in Table 3 the
corresponding data for metal Raschig Super-Ring after the prospectus of
Raschig Company [17] at ratio of the column diameter d c, to the packing size d p
equal to 20 are also presented.

Table 2.
Name Material Surface area freeVol Nom. diam.
2
m /m 3 % mm
Raschig Super Ring No.0.5 Metal 236.2 96 20
Raschig Super-Ring No. 0.7 Metal 175.9 97 25
Raschig Super-Ring No. 1 Metal 155.5 98 30
Raschig Super Ring No. 1.5 Metal 105J 98 38
Raschig Super Ring No. 2 Metal 100.6 98 50
Raschig Super Ring No. 3 Metal 74.9 98 70
IMTP 25 Metal 242.8 97 25
IMTP 40 Metal 171.6 97 40
IMTP 50 Metal 107.1 98 50
IMTP 70 Metal 69.1 98 70
Ralu-Flow No. 1 PP Plastic 177 95 25
Ralu-Flow No.2PP Plastic 98.4 95 50
Raschig Super Ring No. 0.6 Plastic 206.3 96 25
Raschig Super Ring No. 2 Plastic 117.2 96 50