Knowledge

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Neon Column Consultancy
Group

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Components of Packed Column

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Types we Offer

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Structured Types we Offer

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2
Reference:
Seader and Henley

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Select type
and size of
packing
Determine
column height
Determine
column
diameter
Specify
separation
requireme
nt
Select
column
internals
(support and distributor)
Design Procedure

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n
Vout yout
Lin xin
Vin yin
Lout xout
TU
TU
TU
TU
Height of Transfer Unit (HTU)
Transfer Unit (TU)
Packing
Height (Z)
Packing Height (Z) = height of transfer unit (HTU)  number of transfer units (n)
Packing Height(z)

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Operating and Equilibrium Lines

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Importance of Scrubbing
• Scrubbers are equipments used to decrease the
concentration of gaseous streams which pose potential
threat to the environment.
• Diphenylamine is very harmful and may
cause damage to organs(kidney, liver,..)
through prolonged or repeated exposure.
• It is very toxic to aquatic life
• In our current project we will reduce the concentration of
diphenylamine by absorbing it in tap water which is free
from diphenylamine.

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Conventional
Process
•liquid Flow rate : 10,000 Kg/hr i.e. 2.77 Kg/s
•Height of packing: 2.99 m
•Packing Cost : 913 Rs/ Year
•Pumping Cost : 8740 Rs/year
•Total Cost : 9653 Rs/year
Process Before Optimizations

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•Liquid Flow Rate
•Packing Diameter
Optimization
Parameters
• With the help of python programming and Excel we can optimize the
process parameters such as :
What we can do?

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Constraints
Optimization
Parameters
• Max allowable pressure drop = 0.5 (in of water /foot
of water column)
• Minimum flowrate of liquid = 50 Kg/hr.
• Temperature of the system = 30℃
• Pressure of the system = 1 atm.

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Liquid Flow Packaging
C
Pumping C Total Cost H pak C out
(kg/hr) Rs/yr Rs/yr Rs/yr m Kmol/m3
5000 1440 5290 6730 3.66 0.0694
1000 1680 1230 2910 4.27 0.347
500 1770 649 2419 4.5 0.694
300 1830 403 2233 4.66 1.16
87.47 1980 127 2107 5.03 3.97
50 2040 75 2115 5.2 6.94
Optimization Table

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0
500
1000
1500
2000
2500
3000
0 200 400 600 800 1000 1200
ANNUAL
COST(RS)
LIQUID FLOW RATE(KG/HR)
Cost Analysis vs Flow Rate
Packing cost Pumping cost Total Cost
The above graph shows the variation of the total annual cost v/s the liquid flow
rate.
This graph clearly indicates the need of optimization.

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0
500
1000
1500
2000
2500
3000
0 200 400 600 800 1000 1200
TOTAL
COST
LIQUID FLOW RATE(KG/HR)
Total cost vs liquid flow rate
Optimization results show that the optimum liquid flowrate that
should be used to minimize the total cost is = 66.67 Kg/hr.

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0
20
40
60
80
0 200 400 600 800 1000 1200
COUT VS LIQUID FLOW RATE
0
2
4
6
8
0 2000 4000 6000 8000 10000 12000
Hpak
(m)
Liquid flow rate(kg/hr)
HPAK VS LIQUID FLOW RATE
This graph shows the variation of
the outlet concentration v/s the
liquid flowrate
This figure shows the variation of the
height of packing required as the liquid
flowrate changes.

17. about
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Post
optimization
Total
Costs=9653
Rs/year
Total
Costs=2107
Rs/year
BEFORE OPTIMIZATION AFTER OPTIMISATION
•liquid Flow rate : 87.47 Kg/hr i.e. 0.025 Kg/s
•Height of packing: 5.03 m
•Packing Cost : 1980 Rs/ Year
•Pumping Cost : 127 Rs/year
•Total Cost : 2107 Rs/year
Post Optimization

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Packing a
(m2/m3)
Ɛ
pack
c1 c2 c3 Liq.
flow
(Kg/hr.)
Height of
Packing
(m)
Opt
Cost
(Rs/year)
Sulzer
Mellapack
(metal)
250 0.96 1 1 0.32 87.47 5.03 2107
Sulzer
Mellapack
(plastic)
250 0.85 1 1 0.32 86.75 4.57 1914
Sulzer BX-
Packing
450 0.86 15 2 0.35 83.80 1.98 826
Comparison

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