Integration of molten carbonate fuel cells in methanol synthesis
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01M-008/04
H01M-008/06
F02C-003/22
C21B-015/00
C04B-007/36
C01B-003/50
C07C-029/151
C10G-002/00
C07C-001/04
C10K-003/04
C01B-003/16
C25B-003/02
C01B-003/34
H01M-008/14
출원번호
US-0207714
(2014-03-13)
등록번호
US-9343764
(2016-05-17)
발명자
/ 주소
Berlowitz, Paul J.
Barckholtz, Timothy Andrew
Lee, Anita S.
Hershkowitz, Frank
출원인 / 주소
ExxonMobil Research and Engineering Company
대리인 / 주소
Weisberg, David M.
인용정보
피인용 횟수 :
0인용 특허 :
47
초록▼
In various aspects, systems and methods are provided for integration of molten carbonate fuel cells with a methanol synthesis process. The molten carbonate fuel cells can be integrated with a methanol synthesis process in various manners, including providing synthesis gas for use in producing methan
In various aspects, systems and methods are provided for integration of molten carbonate fuel cells with a methanol synthesis process. The molten carbonate fuel cells can be integrated with a methanol synthesis process in various manners, including providing synthesis gas for use in producing methanol. Additionally, integration of molten carbonate fuel cells with a methanol synthesis process can facilitate further processing of vent streams or secondary product streams generated during methanol synthesis.
대표청구항▼
1. A method for synthesizing hydrocarbonaceous compounds, the method comprising: introducing a fuel stream comprising a reformable fuel into an anode of a molten carbonate fuel cell, an internal reforming element associated with the anode, or a combination thereof;introducing a cathode inlet stream
1. A method for synthesizing hydrocarbonaceous compounds, the method comprising: introducing a fuel stream comprising a reformable fuel into an anode of a molten carbonate fuel cell, an internal reforming element associated with the anode, or a combination thereof;introducing a cathode inlet stream comprising CO2 and O2 into a cathode of the fuel cell;generating electricity within the molten carbonate fuel cell;generating an anode exhaust comprising H2, CO, and CO2;separating CO2 from at least a portion of the anode exhaust to produce an anode effluent gas stream;reacting at least a portion of the anode effluent gas stream in the presence of a methanol synthesis catalyst under effective conditions for forming methanol to produce at least one methanol-containing stream and one or more streams comprising gaseous or liquid products; andrecycling at least a portion of the one or more streams comprising gaseous or liquid products to form at least a portion of a cathode inlet stream,wherein the molten carbonate fuel cell is operated (i) such that a CO2 utilization in the cathode is at least about 60% and either (ii) so as to achieve a thermal ratio from about 0.25 to about 1.15, or (iii) such that an amount of the reformable fuel introduced into the anode, the internal reforming element associated with the anode, or the combination thereof, provides a reformable fuel surplus ratio of at least about 1.5, or (iv) both (ii) and (iii). 2. The method of claim 1, further comprising adjusting a composition of the anode exhaust, the anode effluent gas stream, or a combination thereof to achieve a Module value M for the anode effluent gas stream of about 1.7 to about 2.3, where M is defined as M=[H2−CO2]/[CO+CO2]. 3. The method of claim 2, wherein the composition of the anode exhaust is adjusted, and wherein the removal of CO2 from the at least a portion of the anode exhaust achieves the M value for the effluent gas stream of about 1.7 to about 2.3. 4. The method of claim 2, wherein the adjusting step comprises performing a reverse water gas shift process. 5. The method of claim 2, wherein the adjusting step comprises: dividing the anode exhaust or the anode effluent gas stream to form a first divided stream and a second divided stream;performing a reverse water gas shift on the first divided stream to form a first shifted stream; andcombining at least a portion of the first shifted stream with at least a portion of the second divided stream to form an adjusted anode exhaust or an adjusted anode effluent gas stream. 6. The method of claim 1, wherein the anode exhaust has a molar ratio of H2:CO of at least about 3.0:1. 7. The method of claim 1, further comprising compressing the at least a portion of the anode effluent gas stream prior to the reacting in the presence of the methanol synthesis catalyst. 8. The method of claim 1, wherein the one or more streams comprising gaseous or liquid products include at least one stream comprising C2+ alcohols. 9. The method of claim 1, wherein the one or more streams comprising gaseous or liquid products include at least one stream comprising H2, CO, the reformable fuel, or a combination thereof. 10. The method of claim 1, wherein the reacting step further produces at least one stream comprising syngas that is recycled for reacting in the presence of the methanol synthesis catalyst. 11. The method of claim 1, wherein at least about 90 vol % of the reformable fuel is methane. 12. The method of claim 1, wherein the fuel stream further comprises at least 5 vol % of inert gases. 13. The method of claim 1, wherein the fuel stream comprises at least about 10 vol % CO2. 14. The method of claim 1, wherein the fuel stream comprises at least about 10 vol % N2. 15. The method of claim 1, wherein the effective methanol synthesis conditions comprise a pressure from about 5 MPag to about 10 MPag and a temperature from about 250° C. to about 300° C. 16. The method of claim 1, further comprising separating H2O from the anode exhaust, the anode effluent gas stream, or a combination thereof. 17. The method of claim 1, wherein the cathode inlet stream comprises exhaust from a combustion turbine. 18. The method of claim 1, wherein the molten carbonate fuel cell is operated at a thermal ratio of about 0.25 to about 1.0. 19. The method of claim 1, wherein a ratio of net moles of syngas in the anode exhaust to moles of CO2 in a cathode exhaust is at least about 2.0. 20. The method of claim 1, wherein a fuel utilization in the anode is about 50% or less and/or wherein an amount of the reformable fuel introduced into the anode, the internal reforming element associated with the anode, or the combination thereof, provides a reformable fuel surplus ratio of at least about 2.0. 21. The method of claim 1, wherein the molten carbonate fuel cell is operated to generate electrical power at a current density of at least about 150 mA/cm2 and at least about 40 mW/cm2 of waste heat, the method further comprising performing an effective amount of an endothermic reaction to maintain a temperature differential between an anode inlet and an anode outlet of about 100° C. or less. 22. The method of claim 21, wherein performing the endothermic reaction consumes at least about 40% of the waste heat. 23. The method of claim 1, wherein an electrical efficiency for the molten carbonate fuel cell is between about 10% and/or about 40% and a total fuel cell efficiency for the molten carbonate fuel cell is at least about 55%. 24. The method of claim 1, wherein the molten carbonate fuel cell is operated at steady state conditions with regard to the CO2 utilization in the cathode, the thermal ratio, and/or the reformable fuel surplus ratio.
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