Separation Enhanced Dimethyl Ether (DME) Synthesis · ecn.nl Separation Enhanced Dimethyl Ether...
Transcript of Separation Enhanced Dimethyl Ether (DME) Synthesis · ecn.nl Separation Enhanced Dimethyl Ether...
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Separation Enhanced Dimethyl Ether (DME) SynthesisDr. Ir. Jurriaan Boon
21 June 2017, Eurogress, Aachen
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Separation enhanced DME synthesis
• DME: promising fuel for compression ignition vehicles
• Production of DME from biomass
• Conventional production of DME
• Separation enhanced DME synthesis
• Fledged: DME from biomass, renewable electricity
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DME: Fuel of choice
• Promising in terms of GHG emissions, efficiency, economy
• Can be handled like LPG
• Behaves like diesel in a compression ignition enginewithout soot formation!
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Fledged: DME from biomass and hydrogen
2016-2020
GasifierDME
synthesis
Electrolyser
DMESyngas with adjusted composition (M<2)
Biomass
H2
O2
Combustor
Biomass (if needed)
Flue gas to stackair
steam
water
Target syngas composition (M=2)
Circulating solids
𝑀 =H2 − CO2CO + CO2
= 2
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Production of DME
Methanol synthesisCO2+3H2⇌CH3OH+H2O
Water-gas shift (WGS)CO+H2O⇌H2+CO2
Methanol dehydration
2CH3OH⇌CH3OCH3+H2O
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Conventional production of DME
Methanol synthesis
Methanol separation
Synthesis gas
H2/CO/CO2 recycle
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Conventional production of DME
Methanol synthesis
Methanol separation
DME synthesis DME separation DMESynthesis
gas
H2/CO/CO2 recycle Methanol recycle
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Conventional versus direct synthesis
Methanol synthesis
Methanol separation
DME synthesis DME separation DMESynthesis
gas
a) Conventional DME productionH2/CO/CO2 recycle Methanol recycle
Direct DME synthesis DME separation DME
b) Direct DME productionCO/CO2 recycle
SEDMES DME separation DME
c) Sorption-enhanced DME production (SEDMES)Optional CO recycle
Synthesis gas
Synthesis gas
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Steam separation enhanced DME synthesis
Methanol synthesisCO2+3H2⇌CH3OH+H2O
Water-gas shift (WGS)CO+H2O⇌H2+CO2
Methanol dehydration
2CH3OH⇌CH3OCH3+H2O
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Thermodynamic equilibrium
0
5
10
15
20
25
30
150 200 250 300 350
CO
, CO
2, D
ME,
CH
3O
H /
mo
l%
Temperature / °C
DME
CH3OH
CO
CO2
Composition 3
25 bar(a)
54 mol% H2
15 mol% CO7.7 mol% CO2
𝑀 =H2 − CO2CO + CO2
= 2
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Equilibrium with in situ water removal
275 °C25 bar(a)
54 mol% H2
15 mol% CO7.7 mol% CO2
0
5
10
15
20
25
30
35
40
0.001 0.01 0.1 1
Co
mp
osi
tio
n /
mo
l%
Steam slip / mol%
DME
CH3OH
CO
CO2
Composition 3
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Experimental: sorption enhanced DME synthesis
Cu/ZnO/Al2O3 catalystZeolite 3A
syngas
effluent
275 °C25 bar(a)
400 °C2 bar(a)
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Experimental: breakthrough test
0
5E-11
1E-10
1.5E-10
2E-10
2.5E-10
3E-10
3.5E-10
4E-10
4.5E-10
0
2
4
6
8
10
12
14
16
0 20 40 60
MS
sign
al /
A
ND
IR c
on
cen
trat
ion
/ m
ol%
Time / min
CO (NDIR)
CO2 (NDIR)
DME (MS)
CH3OH (MS)
H2 (MS)
H2O (MS)
Composition 3 275 °C25 bar(a)
54 mol% H2
15 mol% CO7.7 mol% CO2
Proof of concept
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Separation enhanced DME synthesis
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Pro
du
ct C
-dis
trib
uti
on
[mo
l%]
MethOH
CO
CO2
DME
Conventional direct DME(thermodynamic calculation)
Sorption enhanced DME(experimental observation)
275°C, 25 bar
Product
Feed
Sorption-enhanced DME synthesis Increased CO/CO2 flexibility Increased DME yield Decreased CO2 content𝑀 = 2
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Conventional, direct, sorption-enhanced synthesis
Methanol synthesis
Methanol separation
DME synthesis DME separation DMESynthesis
gas
a) Conventional DME productionH2/CO/CO2 recycle Methanol recycle
Direct DME synthesis DME separation DME
b) Direct DME productionCO/CO2 recycle
SEDMES DME separation DME
c) Sorption-enhanced DME production (SEDMES)Optional CO recycle
Synthesis gas
Synthesis gas
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Production of DME from biomass
Sorption-enhanced gasification Sorption-enhanced DME synthesis
The FLEDGED project will deliver a process for bio-based dimethyl ether (DME) production from biomass gasification, validated in industrially relevant environment (TRL5).
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Separation enhanced DME synthesis
• DME: promising fuel for compression ignition vehicles• Production of DME from biomass• Conventional production of DME
– Low DME yield– CO2 production– Complex separation
• Sorption enhanced DME synthesis– Increased CO/CO2 flexibility– Increased DME yield– Decreased CO2 content
• Fledged: DME from biomass, renewable electricity
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http://www.fledged.eu/@FledgedProject
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http://www.ecn.nl/research-programme/energy-and-industry/@ECN
Gas separation, treatment & conversion• Development of sorption technology to reduce industrial CO2 emissions• Development of membrane reactors for hydrogen production• Conversion of industrial waste streams into chemicals and transport fuels
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http://www.ecn.nl/research-programme/energy-and-industry/@ECN
Industrial integration of renewable electricity• Development of processes to produce chemicals and fuels
with the help of electricity, e.g. hydrogen• Development of technology to flexibly convert
renewable electricity into heat