Chemical Engineering August 2013 - 49
TABLE 1. EFFECT ON EO ABSORPTION BY VARYING
THE LEAN ABSORBENT FLOW (AT CONSTANT INLET CYCLE-GAS FLOW)
Reduction in lean absorbent flow
versus normal operation, %
-5
-10
-15
-18
-20
EO mole concentration in
EO absorber overhead gas,
simulated values, ppm
3
3
4
4
5
TABLE 2. EFFECT ON EO ABSORPTION BY VARYING THE LEAN ABSORBENT
TEMPERATURE (AT CONSTANT INLET CYCLE-GAS FLOW)
Lean-absorbent temperature increase
versus normal operation, ºC
1ºC
2ºC
3ºC
4ºC
5ºC
EO mole concentration in
EO absorber overhead gas,
simulated values, ppm
3
3
3
4
4
TABLE 3. PLANT TRIAL PLAN TO REDUCE LEAN ABSORBENT FLOW
Lean-absorbent
flow reduction step Days
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
Day 1
Day 2
Day 3
Day 4
Day 5
Day 6
approximation of the EO absorber operation.
Simulation data comparisons
with licensor process-flow-diagram
(PFD) data and actual operating data
validated the SR-Polar EOS.
Ensuring correct inputs to the process
simulation software is also a key
step in creating an accurate model.
Initially, the PFD data were used for
feed composition, and the model predictions
were compared to the stream
compositions for the top and bottom
products from the design-case material
balance. Later, the actual feed
compositions were taken from the
online analyzer and the model predictions
were again evaluated. The model
was then fine-tuned by adjusting the
1.0%
1.0% (Total 2.0%)
1.5% (Total 3.5%)
1.5% (Total 5.0%)
1.5% (Total 6.5%)
1.5% (Total 8.0%)
Total reduction in lean absorbent flow = 8%
absorber's Murphree tray efficiencies
to match the following parameters
with actual plant data:
* Temperature profile along the
column
* Top and bottom product composition
Once the model was tuned, it was used
for sensitivity analyses with respect to
changes in the following properties:
* Lean absorbent flow
* Lean absorbent temperature
The objective of the sensitivity analyses
was to optimize operations without
compromising the EO absorber
performance. The evaluation with
respect to lean absorbent flow led to
the conclusion that an 8% decrease
in flow had no detrimental effect on
Total reduction in lead absorbent flow
to EO absorber, %
Circle 5 on p. 52 or go to adlinks.che.com/45775-05
CHEMICAL ENGINEERING WWW.CHE.COM AUGUST 2013 47
http://adlinks.che.com/45775-05
http://WWW.CHE.COM
Chemical Engineering August 2013
Table of Contents for the Digital Edition of Chemical Engineering August 2013
Contents
Chemical Engineering August 2013 - Cover1
Chemical Engineering August 2013 - Cover2
Chemical Engineering August 2013 - Contents
Chemical Engineering August 2013 - 2
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