Hydrocarbon Processing - June 2022 - GP-32

PROCESS OPTIMIZATION
and CO2
was 67.97%. The amine strength
was 32 wt% (32% for MDEA and 2% for
sulfolane), and the amount of regenerated
steam required for the regenerator
was 307.3 tpd. The total mass flowrate
required from MDEA was 789.51 kg/hr
and 49.3 kg/hr for sulfolane. The concentration
(mole fraction) of methane
in the sweet gas stream was 0.8047; for
ethane, it was 0.1047. The operating conditions
of the rich amine included a pressure
of 48.03 kg/cm2
and a temperature
of 38.81°C (101.9°F). The total mass
flowrate required to remove acid gas by
67.97% was 360 bpd.
Parametic sensitivity analysis and
simulation modeling using MDEA
with a PZ mixture. Treatments by the
PZ activators with MDEA are shown in
TABLE 10. H2
S composition in the sweet
S was 100%, while the recovS
and CO2
gas was 5.211-002 ppm. The recovery for
removed H2
ery of both H2
was also 100%.
TABLE 8. PZ unit dashboard
Component
Reboiler duty, kcal/hr
Regenerator steam, tpd
Acid gas loading in
regenerator bottom
Acid gas loading in
regenerator feed
Value
6.493e+006
307.4
1.93e-003
Acid gas loading in acid stream 7.734e+015
0.7949
Regenerator feed
temperature, °C (°F)
Regenerator reflux ratio
(mole basis)
Amine strength, wt%
Amine recirculation rate, bpd
Lean amine temperature,
°C (°F)
Feed gas flowrate, MMft3
H2S composition
in feed gas, ppm
H2S composition
in sweet gas, ppm
H2
S composition
in acid gas, ppm
H2S composition
in regenerator bottom, ppm
H2S composition
in regenerator feed, ppm
Recovery of amine
unit for H2
S, %
Recovery of amine
unit (H2
S and CO2
), %
d
104.4 (219.92)
162.4
32
165
48 (118.4)
12
599.6
1.872e-002
9.68e+004
1.876
7,525
100
100
32 MAY/JUNE 2022 | GasProcessingNews.com
The amine strength was 32 wt% (16%
for MDEA and 16% for PZ), and the
amount of regenerated steam required
for the regenerator was 306.3 tpd. The
total mass flowrate required from MDEA
with PZ was 435 kg/hr. The concentration
(mole fraction) of methane in the
sweet gas stream was 0.8058; for ethane,
it was 0.1049. The operating conditions
of the rich amine included a pressure
of 48.03 kg/cm2
39.25°C (102.7°F). The total mass flowrate
required to remove acid gas by 100%
was 200 bpd.
Takeaway. This study used proprietary
simulation softwarea
to test GUPCO's gas
sweetening process design calculations.
While the plant receives high amounts
of acid gas, this challenge can be solved
by changing the type of amine used at
the gas sweetening plant. In addition, the
simulation study achieved a high rate of
Component
TABLE 9. MDEA with sulfolane unit dashboard
Value
Reboiler duty, kcal/hr
Regenerator steam, tpd
Acid gas loading in
regenerator bottom
Acid gas loading in
regenerator feed
6.493e+006
307.3
3.377e-004
Acid gas loading in acid stream 7.242e+018
0.3375
Regenerator feed
temperature, °C (°F)
Regenerator reflux ratio
(mole basis)
Amine strength, wt%
Amine recirculation rate, bpd
Lean amine temperature,
°C (°F)
Feed gas flowrate, MMft3
H2S composition
in feed gas, ppm
H2S composition
in sweet gas, ppm
H2
S composition
in acid gas, ppm
H2S composition
in regenerator bottom, ppm
H2S composition
in regenerator feed, ppm
Recovery of amine
unit for H2
S, %
Recovery of amine
unit (H2
S and CO2
), %
d
104.4 (219.92)
232.5
32
360
48 (118.4)
12
599.6
1.549
1.376e+005
3.21e-005
3,650
99.74
67.97
acid removal for nearly all amine types
and blends, enabling the natural gas to
meet pipeline specifications. The optimal
solution was 32% MEA with a circulation
rate of 170 bpd.
The study also examined several process
parameters, including reboiler duty,
regenerator steam and acid gas removal.
According to the simulation, 32% MEA
is the most recommended amine for the
and a temperature of
process; however, PZ and MDEA at 32
wt% (16% PZ and 16% MDEA) reached
full efficiency characteristics. A recirculation
rate of 200 bpd was required, though,
while the PZ activator needed a recirculation
rate of 165 bpd. The cost of PZ
chemicals is more expensive than the cost
of MEA chemicals, as well. GP
NOTE
a
Aspen HYSYS V8.8
LITERATURE CITED
Complete literature cited available online at
www.GasProcessingNews.com.
Component
TABLE 10. MDEA with PZ unit dashboard
Value
Reboiler duty, kcal/hr
Regenerator steam, tpd
Acid gas loading in
regenerator bottom
Acid gas loading in
regenerator feed
6.493e+006
306.3
4.726e-004
Acid gas loading in acid stream 4.354e+016
0.756
Regenerator feed
temperature, °C (°F)
Regenerator reflux ratio
(mole basis)
Amine strength, wt%
Amine recirculation rate, bpd
Lean amine temperature,
°C (°F)
Feed gas flowrate, MMft3
H2S composition
in feed gas, ppm
H2S composition
in sweet gas, ppm
H2
S composition
in acid gas, ppm
H2S composition
in regenerator bottom, ppm
H2S composition
in regenerator feed, ppm
Recovery of amine
unit for H2
S, %
Recovery of amine
unit (H2
S and CO2
), %
d
104.4 (219.92)
162.4
32
200
48 (118.4)
12
599.6
5.211e-002
9.683e+004
5.379
6,303
99.99
100
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Hydrocarbon Processing - June 2022

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