Improvement of
Stripping Index
of Catacarb
system at
Ammonia -2
Ibrar Khalid
Ammonia-2 Operations
University of Engineering and Technology Lahore
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Ammonia 2
Front End
i) Reforming Post
ii)Purification post
Back End
i) Compressor Post
ii) Synthesis Post
Feed Gas Compression
Feed gas Desulfurization
ReformingShift Conversion
Reaction
CO2 Removal
Methanation Mol. Sieves
Syngas Compression
Conversion and
Condensation of Ammonia
Purification Post
To remove CO2 from synthesis gas which
is going to back end for synthesis of
Ammonia
Two Major operations
1. Absorption
2. Stripping
Stripping
Stripper is used to separate a
minor component (solute)
from liquid (solvent) which
has absorbed it in absorber.
Regeneration of solvent of
absorber
Suitable conditions for
stripper
High temperature
Low pressure
Stripping Index
Amount of energy needed to remove/ strip out 1 lb
mol of CO2 in the stripper
Calculated by applying energy balance on the
stripper
Gives us an idea about efficient working of
stripper
Refrige machine
Two stage compressor working in refrigeration
loop
Pressurize all in taken ammonia vapors up to
required pressure so that these can be
condensed back into liquid routed through
condensers
)/(ln(])
(ln1
[s
d
s
dPolytropic
T
T
P
P
k
kEfficiency
Recommendations
40 psig steam flow rate to be reduced
Ejectors cleaning is required
Increase pressure of 60 psig steam up to 68-69 psig
Decrease the flow rate of Lean solution and
increase the flow rate of semi lean solution
Lines coming to ejectors also need insulation on
some points