Transfer Processes: Absorption Column Design Assignment -
An absorption column is required to remove CO2 from a 200 kmol/hr flue gas stream using aquaeous monoethanolamine (MEA) at a flow rate of 710 kmol/hr. The gas feed to the bottom of the column contains 12 mole% CO2 in air, and the exhaust gas stream from the column should contain no more than 0.5 mole% CO2. The MEA fed to the top of the column is taken from a regeneration column and contains 2 mole% CO2. Packing in the form of ceramic raschig rings are available in sizes from 0.5 to 3 inches, the column should be designed for a pressure drop of 0.25 inches H2O per foot of packing.
a) Determine the fraction of CO2 in the liquid stream leaving the column and evaluate the height and diameter of the column required for each choice of packing.
b) Assess the operating and flooding pressure drop for each packing arrangement and recommend a packing size for this operation?
c) Sketch the chosen column arrangement.
Equilibrium data:
|
x
|
0.02
|
0.025
|
0.03
|
0.035
|
0.04
|
0.045
|
0.05
|
0.055
|
|
y
|
0.001
|
0.002
|
0.0035
|
0.006
|
0.01
|
0.015
|
0.022
|
0.032
|
Packing data:
|
Nominal size (in)
|
1/2
|
5/8
|
3/4
|
1
|
1 1/2
|
2
|
3
|
|
Packing factor, F (ft-1)
|
580
|
380
|
225
|
179
|
93
|
65
|
37
|
|
Interfacial area, a (m2/m3)
|
111
|
100
|
80
|
58
|
38
|
28
|
19
|
Attachment:- Assignment File.rar