accurate screening of candidate by the wetted wall column - iea greenhouse gas … cap/2-2 texas...
TRANSCRIPT
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Accurate Screening of Candidate Solvents by the Wetted Wall Column
Xi Chen, Ross Dugas, Fred Closmann, Shan Zhou, Gary T. Rochelley
The University of Texas at Austin
12th MEETING of the INTERNATIONAL POST‐COMBUSTION CO2 CAPTURE NETWORK
Sep 29, 2009p
Regina, Canada
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Outline• Background
• Research needs• Research needs• Literature review
• Apparatus• Apparatus• Wetted Wall Column (WWC)
• Results:• Results:• CO2 solubility, CO2 capacity, Heat of absorption• Absorption/Desorption Rates• Absorption/Desorption Rates
• Conclusions
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Research Needs• Previous amine capacity & kinetics studies:
– Low amine concentration (< 3 M)
– Zero or very lean CO2 loading
– Narrow temperature range (25~60 oC)
• Typical industrial conditions for CO2 capture
– Absorber: 40‐60 oC
St i 80 120 oC– Stripper: 80‐120 oC
– 12% CO2 in flue gas at 1atm and 90% removal: CO2‐loaded amine solvent (P*CO2 lean=0.5 kPa and P*CO2 rich=5 kPa)amine solvent (P CO2,lean 0.5 kPa and P CO2,rich 5 kPa)
• Previous amine screening efforts
– Simple gas sparging: Absorption rate affected by solution property (density, viscosity & surface tension etc.)
– CO2 capacity for industrial conditions not available
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Why WWC for Screening?Why WWC for Screening?
• More representative of commercial packingMore representative of commercial packing than laminar jet or stirred cell.
• More accurate VLE and mass transfer rate in• More accurate VLE and mass transfer rate in loaded solution.
Ad f d i f b b d i• Adequate for design of absorber and stripper.
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[Amine]
Previous work with WWC
Literature Solvents[Amine]max
(molality)
Dugas 2009 MEA/PZ 13
/Cullinane 2005 K+/ PZ 4
Al‐Juaied 2004 DGA / Morpholine 18Al Juaied 2004 DGA / Morpholine 18
Bishnoi 2000 MDEA/PZ 8
Pacheco 1998 MDEA/ DGA 12
Mashewa 1995 MDEA/DEA 9
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Viscosity@
Scope of this work
Conc. (m)
Viscosity@40oC&P*CO2
=5kPa (cP)( )
PrimaryA i
Ethanolamine (MEA) 7 2.5
Ethylenediamine (EDA) 12 14Amines
Diglycolamine® (DGA®) 10 n/a
Piperazine (PZ) 8 10Piperazine & derivatives
p ( )
N‐(2‐hydroxyethyl)piperazine(HEP) 7.7 17
1‐(2‐Aminoethyl)piperazine (AEP) 6 231 (2 Aminoethyl)piperazine (AEP) 6 23
Hindered Amines
2‐amino‐2‐methyl‐1‐propanol (AMP) 4.8 4
2‐piperidineethanol (2‐PE) 8 242‐piperidineethanol (2‐PE) 8 24
PromotedTertiary Amine
Methyldiethanolamine (MDEA)/Piperazine (PZ)
7/2 8
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Wetted Wall Column
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kR 1
1 = 022CO
EkH
R = CO
COP
kR
][1 *
032
∂
∂=
gk lEk TPRODl COk ][ 2, ∂
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'2
*
00
11][
111 22
ggT
CO
PRODll
CO
gG kkCOP
kEkH
kK+=
∂
∂++=
2, ][ ggTPRODllgG
)( lCOgCOgCO PPKN −=
22
222
)(
)(
,,'
,,
lCOiCOg
lCOgCOgCO
PPk
PPKN
−=
22
2
,,
'
lCOiCO
COg PP
Nk
−=⇒
2
22
][2
,,
bCO
lCOiCO
HAmkD
≈2COH
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10m DGA® @ 60°C, CO2 ldg= 0.4 mol/mol alka
2.5 x 10-7
1.3 x 10-7
m2 ))
E lib i i t (P * 2670 P )
0-3000 -1500 0 1500 3000m
ol/(s
*c Equlibrium point (Pco2*=2670 Pa)
-1.3 x 10-7
3000 500 0 500 3000
Flux
(m
2 5 x 10-7-2.5 x 10
Driving force (PCO2,g
- P*CO2,l
) (Pa)
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PIPERAZINE DERIVATIVESPIPERAZINE DERIVATIVES
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CO2 Solubility 7 7m HEP
N
NH
OH
100
7.7m HEP2//ln ααα ⋅+⋅+⋅++= eTdcTbaP
NH
10100 °C5kPa
1
P* (k
Pa)
80 °C
0.5kPa
0.1
P
60 °CCapacity=0.68mol CO2/kg
0.01
40 °Cmol CO2/kg (H2O+HEP)
0 0.05 0.1 0.15 0.2 0.25 0.3
CO2 Loading (mol/mol alkalinity)
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6m AEP N
NH
NH2
100100
ol))/1(
)(lnTdPdRHabs −=Δ
NH
8010
n (kJ/mo)/1( Td
5kPa
40
60
0 1
1
sorption
P* (k
Pa)
80 °C
100 °C
0.5kPa
20
40
0.01
0.1
at of a
bsP
60 °C
0.66
0
20
0.001
0.01
Hea
40 °Cmol CO2/kg Solv.
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4
CO2 Loading (mol/mol alkalinity)
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HINDERED AMINEHINDERED AMINE
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8m 2‐PE NH
OH
100
10
80 °C
100 °CPZ@100 °C
5kPa
1
* (kPa)
60 °C
80 C5kPa
0.1
P*
40 °C
0.5kPa 1.23mol CO2/kg Solv.
0.01
PZ@40 °C (Hilliard & Dugas)
0.01
0.1 0.2 0.3 0.4 0.5 0.6 0.7
CO2 Loading (mol/mol alkalinity)
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PRIMARY AMINEPRIMARY AMINE
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12m EDA
NH
NH2
100NH2
10 MEA@100°C (Hilliard & Dugas)
MEA@40°C
5
0 1
1
P* (k
Pa)
100 °C
MEA@40°C
0.5
0.01
0.1P
80 °C0.78mol CO2/kg Solv
0.001
0.01
40 °C60 °C
Solv.
0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55
CO2 Loading (mol/mol alkalinity)
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PROMOTED TERTIARY AMINEPROMOTED TERTIARY AMINE
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7m MDEA/2m PZ NHNHOH
NOH
CH3
100
PZ@100 °C
10100 °C
P* (k
Pa)
80 °C
° ( ll d )
5
1
P
60 °C
PZ@40 °C (Hilliard & Dugas)
0.5
0.1
40 °C0.71mol CO2/kg Solv.
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35
CO2 Loading (mol/mol alkalinity)
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CO2 Capacity for 5kPa Rich Solution
8m PZ
8 2 PE
1.0mol/kg
ne))
8m 2‐PE
1.0
pacity (m
er+amin
7m MEA
CO2cap
(wate
7.7m HEP
0.1
5 50 500 50005 50 500 5000
Lean Partial Pressure of CO2 (Pa)
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1 4
1.2
1.4/kg
2-PE
0.8
1
mol CO
2/mine))
PZMDEA/PZ EDA
AMP
0.6
pacity (m
H2O
+am MDEA/PZ
HEPAEP
MEA
0.2
0.4
CO2 ca (
DGA
0
0 0.2 0.4 0.6 0.8 1 1.2
Rich CO2 loading (mol CO2/mol amine)
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Enthalpy of CO2 Absorption84
J/mol)
7m MEA
76
80
ption (kJ
8m 2‐PE4.8m AMP 12m EDA
72
O2ab
sor
7.7m HEP
68
py of C
O 7.7m HEP8m PZ
60
64
Enthal
7m MDEA/2m PZ
0.1 0.2 0.3 0.4 0.5 0.6 0.7
CO2 Loading (mol/mol alkalinity)
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1E-05
22' ][ CODAmk
2
22' ][
CO
COg H
DAmkk ≈
1E 06ol/s
. Pa.
m2 )
40˚C1E-06
k g' (
mo
100˚C80˚C60˚C
0 C
Filled Points – 2, 5, 8, 12 m PZEmpty Points – 7, 9, 11, 13 m MEA
1E-070.01 0.1 1 10
Empty Points 7, 9, 11, 13 m MEA
(by Ross Dugas)
P*CO2 @ 40C (kPa)
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Absorption/Desorption rates for 7.7m HEP
5E-06
bCOiCO
COg PP
Nk
,,
'
22
2
−=
m2 )
7 m MEA@40°C8 m PZ@40°C
,, 22
5E-07
ol/s
. Pa.
m
HEP@100°C
HEP@80°C
k g' (
mo HEP@80°C
HEP@40°CNOH
5E 08
HEP@60°C
NH
5E-080.01 0.1 1 10
P*CO2 @ 40C (kPa)
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8m 2‐PE
40°C
m2 )
7 m MEA@40°C8 m PZ@40°C
80°C
60°C
40 C
1E-06
ol/s
. Pa.
m
100°C
80°C
k g' (
mo
NH
OH
1E 071E-070.01 0.1 1 10
P*CO2 @ 40C (kPa)
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12m EDA m
2 )
8 m PZ@40°C80°C
1E-06
ol/s
. Pa.
m 7 m MEA@40°C
100°C
k g' (
mo
60°C40°CNH2
1E 07
NH2
1E-070.01 0.1 1 10
P*CO2 @ 40C (kPa)
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7m MDEA/2m PZ m
2 )
7 m MEA@40°C8 m PZ@40°C
80°C60°C40°C
1E-06
ol/s
. Pa.
m
100°C
k g' (
mo
NHNHN
CH3
1E 07
NHNHOH
NOH
1E-0710 100 1000 10000
P*CO2 @ 40C (Pa)
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5E-06
7m MDEA/2 PZ
m2 ) 8m PZ
7mMEA
5E-07
ol/s
. Pa.
m 7m MEA
k g' (
mo
7.7m HEP8m 2‐PE
5E 085E-0850 500 5000 50000
P*CO2 @ 40C (Pa)
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Apparent second order reaction rate of amine with CO
Amine k2 (m3/mol·s) Source
of amine with CO2
PZ 54 (Bishnoi and Rochelle 2000)
AEP 30 (Bishnoi 2000)( )
HEP 12 (Bishnoi 2000)
EDA 8.8 (Sada et al. 1977)
MEA 5.9 (Blauwhoff et al. 1984)
DGA 5.1 (Pacheco 1998)
AMP 0.7 (Saha and Bandyopadhyay 1995)
2-PE 0.6 (Xu et al. 1993)
MDEA 0.005 (Versteeg and Van Swaaij 1988)
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5
6
PZ
MDEA/PZ
4
s∙Pa
∙m2 )
MEA3
107 m
ol/s
HEP
AEP
MEA
DGAAMP
1
2
kg' (×1
AEP
EDA2-PE
AMP
0
0 10 20 30 40 50 600 10 20 30 40 50 60
k2 (m3/mol∙s)
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Conclusions
Fast solvents
Conc
CO2 Capacity@PCO2,lean=0.5kPa
kg’ @PCO2=5kPa
∆Habs@PCO2=1.5kPa
Amine Conc(m) (mol/kg
(water+amine))
(×107mol/s·Pa·m2) (kJ/mol)
MDEA/PZ 7/2 0.71 5.7 67PZ 8 0.79 5.3 70
MEA 7 0 47 3 1 82MEA 7 0.47 3.1 82MEA 11 0.52 2.5 84
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CO2 Capacity@P 0 5kP
kg’ @PCO25kP
∆Habs@PCO21 5kP
Slow solvents
Amine Conc.(m)
PCO2,lean=0.5kPa =5kPa =1.5kPa
(mol/kg (water+amine))
(×107mol/s·Pa·m2) (kJ/mol)( ))
MEA 7 0.47 3.1 82HEP 7.7 0.68 2.9 69
DGA® 10 0.38 2.4 81AEP 6 0.66 2.3 722 PE 8 1 23 2 732-PE 8 1.23 2 73AMP 4.8 0.96 1.7 73EDA 12 0.78 1.6 80
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AcknowledgementAcknowledgement
• Luminant Carbon Management ProgramLuminant Carbon Management Program
• Industrial Associates Program for CO2 Capture by Aqueous Absorptionby Aqueous Absorption
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Accurate Screening of Candidate Solvents by the Wetted WallSolvents by the Wetted Wall
Column