Environmental Engineering Reference
In-Depth Information
Table 6.2
Physical characteristics of dry commercial packings (after [5]).
Reprinted by permission of John Wiley and Sons, Inc. Copyright
c
1980.
Percent
Specific
Dumped
Packing
voids
surface (
a
v
)
weight
Packing
m
2
/
m
3
kg
/
m
3
(lb
/
ft
3
)
in (mm)
(
)
factor (
F
)
Ceramic Raschig rings
1
/
4
(6.35)
73
787
737 (46)
1600
1
/
2
(12.7)
63
364
865 (54)
580
1 (25.4)
73
190
641 (40)
155
2 (50.8)
74
92
609 (38)
65
Metal Raschig (rings (1
/
16 inch wall)
1
/
2
(12.7)
73
387
2114 (132)
410
1 (25.4)
85
187
1137 (71)
137
2 (50.8)
92
103.0
59 (37)
57
Berl saddles
1
/
4
(6.35)
60
899
897 (56)
900
1
/
2
(12.7)
63
466
865 (54)
240
1 (25.4)
69
249
721 (45)
110
2 (50.8)
72
105
641 (40)
45
Pall rings
1 (25.4)
93.4
217.5
529 (33)
48
2 (50.8)
94.0
120
440.5 (27.5)
20
A
I
Direction of mass
y
A
transfer
(opposite for stripping)
x
A
I
•
x
A
y
A
I
Figure 6.11
Mass transfer at interface between liquid (
left
) and vapor (
right
)
phases.
solute both through the gas phase to the liquid/gas interface and across the interface into
the liquid phase. When one can assume equimolar counter-transfer of the more volatile
and less volatile components (a good assumption for,
dilute
absorbers and strippers), the
rate of mass transfer is:
Rate
=
A
I
k
y
(
y
A
−
y
A
I
) for the vapor phase, and
Rate
=
A
I
k
x
(
x
A
I
−
x
A
) for the liquid phase.
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