Production of synthesis gas blends for conversion to methanol or Fischer-Tropsch liquids
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C01B-003/24
C01B-003/00
C01B-003/26
C07C-027/06
C07C-027/00
C07C-005/00
출원번호
US-0211982
(2005-08-25)
등록번호
US-7485767
(2009-02-03)
발명자
/ 주소
Lattner,James R.
Jenkins,Christopher D. W.
출원인 / 주소
ExxonMobil Chemical Patents Inc.
인용정보
피인용 횟수 :
5인용 특허 :
6
초록▼
The present invention provides a process for producing synthesis gas blends which are especially suitable for conversion either into oxygenates such as methanol or into Fischer-Tropsch liquids. Such a process involves reforming of two separate gaseous hydrocarbon feedstreams (formed, for example, by
The present invention provides a process for producing synthesis gas blends which are especially suitable for conversion either into oxygenates such as methanol or into Fischer-Tropsch liquids. Such a process involves reforming of two separate gaseous hydrocarbon feedstreams (formed, for example, by dividing a natural gas feedstock) in a steam-reforming unit and an oxygen-blown reforming unit, respectively. The syngas effluent from each reforming unit is then combined, after appropriate pressure adjustments, to realize a synthesis gas blend containing selected amounts and ratios of H2, CO and CO2. In further invention embodiments, processes are provided for converting the resulting syngas blends into oxygenates or Fischer-Tropsch hydrocarbons. Further conversion of the oxygenates so produced into light olefins also constitutes part of this invention.
대표청구항▼
We claim: 1. A process for the production of a synthesis gas blend which is suitable for conversion either to methanol and/or dimethyl ether or to Fischer-Tropsch liquids, which process comprises: a) passing a first gaseous hydrocarbon feedstream, along with steam, to a steam reforming unit operate
We claim: 1. A process for the production of a synthesis gas blend which is suitable for conversion either to methanol and/or dimethyl ether or to Fischer-Tropsch liquids, which process comprises: a) passing a first gaseous hydrocarbon feedstream, along with steam, to a steam reforming unit operated at a pressure of less than 30 bar and with a steam to carbon molar ratio greater than 1.5, thereby providing as effluent from said steam reforming unit a first syngas effluent stream containing H2 and carbon oxides; b) passing a second gaseous hydrocarbon feedstream, along with oxygen and optionally steam, to an oxygen-blown reforming unit operated at a pressure of greater than 35 bar and with an O2:C molar ratio of from about 0.4 to 0.7 and a steam to carbon molar ratio of less than about 1.5, thereby providing as effluent from said oxygen-blown reforming unit a second syngas effluent stream containing H2 and carbon oxides; c) compressing said first syngas effluent stream to a pressure substantially equal to that of said second syngas effluent stream; and thereafter d) combining said first and second syngas effluent streams in a ratio suitable to provide a syngas blend effluent having: i) a Stoichiometric Ratio SN ranging from about 2.0 to 2.2; ii) an H2/CO molar ratio greater than about 1.9; and iii) a CO2 content of about 5.5 mol % or less. 2. A process according to claim 1 wherein the first and second gaseous feedstreams each contain at least 50 mol % of methane. 3. A process according to claim 2 wherein said first and second gaseous hydrocarbon feedstreams have substantially the same methane content. 4. A process according to claim 3 wherein said first and second gaseous hydrocarbon feedstreams are formed by dividing a natural gas feedstock. 5. A process according to claim 3 wherein the ratio of moles/hr of methane in said first gaseous hydrocarbon feedstream to moles/hr of methane in said second gaseous hydrocarbon feedstream ranges from about 1:1 to 1:4. 6. A process according to claim 4 wherein the total natural gas feed rate to the process ranges from about 750 kgmol/hr to 45,000 kgmol/hr. 7. A process according to claim 1 wherein the steam reforming unit is operated at a pressure ranging from about 10 to 28 bar and an exit temperature of from about 750�� C. to 950�� C., using a steam to carbon molar ratio ranging from about 1.8:1 to 4:1. 8. A process according to claim 7 wherein the steam reforming unit utilizes at least one catalyst comprising an active metal or metal oxide of Group 6 or Groups 8-10 of the Periodic Table of the Elements. 9. A process according to claim 8 wherein the oxygen-blown reforming unit is an autothermal reforming unit operated at a pressure ranging from about 37 to 45 bar and an exit temperature of from about 900�� C. to 1150�� C., using an O2:C molar ratio ranging from about 0.5:1 to 0.65:1 and a steam to carbon molar ratio ranging from about 0.4:1 to 1:1. 10. A process according to claim 9 wherein the autothermal reforming unit utilizes a catalyst comprising at least one transition element selected from the group consisting of Ni, Co, Pd, Ru, Rh, Ir, Pt, Os, Fe and combinations thereof. 11. A process according to claim 8 wherein the oxygen-blown reforming unit is a partial oxidation reforming unit operated at a pressure ranging from about 50 to 100 bar and a exit temperature of from about 1100�� C. to 1500�� C., using an O2:C molar ratio ranging from about 0.5 :1 to 0.7:1. 12. A process according to claim 1 wherein the compressed first syngas effluent stream and the second syngas effluent stream are at a pressure of from about 35 to 100 bar. 13. A process according to claim 6 wherein the syngas blend effluent has: a) a Stoichiometric Number SN which ranges from about 2.05 to 2.1; b) an H2/CO molar ratio of from about 2.0 to 2.8; and c) a CO2 content of from about 2 mol % to 5 mol %. 14. A process according to claim 13 wherein CO2 is removed from one or more of the syngas effluent streams so as to reduce the CO2 content in said syngas blend effluent to less than 4 mol %. 15. A process according to claim 14 wherein CO2 is removed from the syngas effluent from the steam reforming unit and at least part of the CO2 removed from said syngas effluent is recycled to the steam reforming unit. 16. A process for the production of Fischer-Tropsch liquids, which process comprises preparing a syngas blend according to the process recited in claim 1, and then contacting said syngas blend with an iron and/or cobalt-based Fischer-Tropsch catalyst under conditions suitable to convert at least part of said syngas blend to Fischer-Tropsch liquids. 17. A process for the production of an oxygenate product, which process comprises preparing a syngas blend according to the process recited in claim 1, and then contacting said syngas blend with one or more metal-containing conversion catalysts under conditions suitable to convert at least a part of said syngas blend to an oxygenate-containing product. 18. A process for the production of an oxygenate product comprising methanol, dimethyl ether or methanol/dimethyl ether blends, which process comprises preparing a syngas blend according to the process recited in claim 13, and then contacting said syngas blend with one or more metal-containing conversion catalysts under conditions suitable to convert at least part of said syngas blend to oxygenates comprising methanol and/or dimethyl ether and wherein the water content of said syngas blend is not reduced prior to its contact with said conversion catalyst. 19. A process for the production of light olefins from oxygenates, which process comprises preparing an oxygenate feedstock comprising methanol, dimethyl ether or methanol/dimethyl ether blends according to the process recited in claim 18, and then contacting said oxygenate feedstock with a molecular sieve catalyst under conditions suitable for converting at least a part of said oxygenate feedstock to light olefins.
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이 특허에 인용된 특허 (6)
Ramani, Sriram; Allison, Joe D.; Keller, Alfred E., Controlling syngas H2:CO ratio by controlling feed hydrocarbon composition.
Fong Wing-Chiu F. (Yorktown Heights NY) Wilson Raymond F. (Fishkill NY), Gasification process combined with steam methane reforming to produce syngas suitable for methanol production.
Christian Friedrich Gottzmann ; Ravi Prasad ; Joseph Michael Schwartz ; Victor Emmanuel Bergsten ; James Eric White ; Terry J. Mazanec ; Thomas L. Cable ; John C. Fagley, Process for producing a syngas.
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