Catalytic Partial Oxidation of Methane to Syngas and the DME Synthesis

1
Catalytic Partial Oxidation of Methane to Syngas
and the DME Synthesis from the Syngas Containing
N2
we try to use air instead of pure oxygen for a
syngas production by CPO without an
air-separation installation. The key question
induced by air CPO is whether the syngas
containing N2 could be effectively used for the
downstream product synthesis. For methanol
synthesis, since a great deal of feedstock needs
to be recycled for its low single pass
conversion, the existence of N2 which causes a
large increase of compression cost of gases, is
clearly unfit for its requirement. But for
dimethyl ether, A great deal of experimental
results have provided that the single pass CO
conversion could be reached to 90 over many
kinds of catalysts, which means the feedstock
gases no longer need to be recycled. Therefore,
we have done a lot of work on an integration of
the air CPO with the DME synthesis from syngas
containing N2, and to see whether it could offer
a cheaper route for DME production.
2
Catalytic Partial Oxidation of Methane and Air
The effects of temperature on catalytic activities The effects of temperature on catalytic activities The effects of temperature on catalytic activities The effects of temperature on catalytic activities The effects of temperature on catalytic activities The effects of temperature on catalytic activities The effects of temperature on catalytic activities
T/? CH4 CO2 H2O CO H2 N2
500 14.43 7.69 25.09 0.60 9.66 42.53
550 12.79 7.96 22.72 1.39 13.70 41.45
600 10.74 7.88 20.17 2.80 18.32 40.09
650 8.33 7.30 17.65 4.94 23.28 38.51
700 5.78 6.33 15.34 7.56 28.17 36.82
750 3.46 5.24 13.45 10.16 32.41 35.29
800 1.74 4.31 12.17 12.20 35.43 34.15
850 0.75 3.65 11.56 13.50 37.05 33.50
(CH4/Air/H2O1/2.4/0.8,0.8MPa) (CH4/Air/H2O1/2.4/0.8,0.8MPa) (CH4/Air/H2O1/2.4/0.8,0.8MPa) (CH4/Air/H2O1/2.4/0.8,0.8MPa) (CH4/Air/H2O1/2.4/0.8,0.8MPa) (CH4/Air/H2O1/2.4/0.8,0.8MPa) (CH4/Air/H2O1/2.4/0.8,0.8MPa)
The effects of H2O/CO2 ratios on catalytic activities The effects of H2O/CO2 ratios on catalytic activities The effects of H2O/CO2 ratios on catalytic activities The effects of H2O/CO2 ratios on catalytic activities The effects of H2O/CO2 ratios on catalytic activities The effects of H2O/CO2 ratios on catalytic activities The effects of H2O/CO2 ratios on catalytic activities
R CH4 CO2 H2O CO H2 N2
12/0 0.44 4.43 15.85 11.67 36.19 31.42
11/1 0.44 4.93 15.50 12.80 34.87 31.45
10/2 0.46 5.38 14.95 14.03 33.80 31.39
9/3 0.45 5.89 14.57 15.17 32.51 31.41
8/4 0.43 6.48 14.31 16.23 31.10 31.46
(RH2O/CO2,850?,1MPa,(H2OCO2)/ CH4 1.2/1) (RH2O/CO2,850?,1MPa,(H2OCO2)/ CH4 1.2/1) (RH2O/CO2,850?,1MPa,(H2OCO2)/ CH4 1.2/1) (RH2O/CO2,850?,1MPa,(H2OCO2)/ CH4 1.2/1) (RH2O/CO2,850?,1MPa,(H2OCO2)/ CH4 1.2/1) (RH2O/CO2,850?,1MPa,(H2OCO2)/ CH4 1.2/1) (RH2O/CO2,850?,1MPa,(H2OCO2)/ CH4 1.2/1)
3
H2
N2
CO
CO2
CH4
The catalyst stability for CPO of methane with air
(850?,0.8MPa,Natural gas/Air/H2O/CO21/2.4/0.8/0.4
)
DME Synthesis from the Syngas Containing N2
4
5.0MPa
5
Catalytic Combustion
Electricity
CH4
Air
DME Synthesis Reactor
Syngas (N2)
Compressor
Tail gas
H2O
H2O
DME
Compressor
CO2
CO2
The process of DME synthesis from syngas obtained
by catalytic partial oxidation of methane with air
6
Catalytic Partial Oxidation of Methane in
Fluidized Bed Reactor
The temperature profiles in fluidized bed
The results of CPO in fluidized compared with the
data calculated by thermodynamic
7
The results of catalytic oxidation of methane
along catalyst bed
The comparison of the results of carbon
deposition in fixed bed and fluidized bed
8
The results of catalytic oxidation of methane and
methane reforming with carbon dioxide along
catalyst bed