Page 168 - Air pollution and greenhouse gases from basic concepts to engineering applications for air emission control

142 5 Principles for Gas Separation

Table 5.6 Packing data (Adapted from Bhatia [2])
Packing type Material Nominal Area per
3
2
size (in.) volume (m /m )
Ceramic and porcelain ¼ 899
Berl saddle
½ 509
1 259
2 105
Plastic 1 207
Intalox saddle 2 108
3 89
Ceramic ¼ 984
½ 623
1 256
2 118
Ceramic and porcelain ½ 374
Raschin ring 1 190
1½ 118
2 92
3 62
Metal 5/8 × 0.018 thick 341
Pall ring 1½× 0.03 thick 128

1 180
Tellerette
2 125
3 98

two-film model (see Chap. 2), the mass transfer in the liquid phase within the
elemental height, dz, in the tower is

d LxðÞ ¼ k x x i xð ÞdA i ð5:38Þ

where dA i is the gas–liquid interfacial surface area over the height of dz, and it
3
2
depends on the packing material property, a (m /m of tower), which is the surface
area per bulk volume in the tower.
Typical packing materials and the corresponding surface areas are summarized
in Table 5.6 [2]. The packing materials are designed to maximize the gas-liquid
interfacial area with low resistance to the flow. Nonetheless, these values are only
for guide purpose only. Users are strongly recommended to get updated data from
packing suppliers if needed.
Consider a tower with a cross-sectional area A c filled with packing materials
2
3
characterized with a (m /m ). The interfacial surface area over the height of dz is