[미국특허]
Reducing CO2 levels in CO2-rich natural gases converted into liquid fuels
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C10G-03500
C07C-02700
출원번호
US-0118029
(2002-04-09)
발명자
/ 주소
O'Rear, Dennis J.
출원인 / 주소
Chevron U.S.A. Inc.
대리인 / 주소
Burns, Doane, Swecker &
인용정보
피인용 횟수 :
8인용 특허 :
15
초록▼
Provided is a process for converting CO2-rich natural gas into liquid fuel. The process includes introducing a CO2-rich natural gas feed stream into a synthesis gas formation reactor and then forming a synthesis gas. At least a portion of the synthesis gas is then introduced into a Fischer-Tropsch r
Provided is a process for converting CO2-rich natural gas into liquid fuel. The process includes introducing a CO2-rich natural gas feed stream into a synthesis gas formation reactor and then forming a synthesis gas. At least a portion of the synthesis gas is then introduced into a Fischer-Tropsch reactor. A Fischer-Tropsch process is conducted generating a Fischer-Tropsch product. A naphtha is separated from the Fischer-Tropsch product and introduced into a naphtha reformer. Hydrogen by-product is generated by reforming the naphtha to obtain a C6-C10 product having a hydrogen to carbon ratio less than about 2.0. At least a portion of the hydrogen by-product is recirculated and mixed with the CO2-rich natural gas feed stream. The hydrogen by-product mixes with the CO2-rich natural gas feed stream such that at least a portion of the CO2 present in the natural gas feed stream is converted into additional CO by a reverse water gas shift reaction so that the synthesis gas derived from the feed stream contains a volume amount of CO2 that is less than a volume amount of CO2 present in the feed stream prior to mixing with the hydrogen by-product. Finally, the additional CO is converted into hydrocarbons in the Fischer-Tropsch reactor.
대표청구항▼
1. A process for converting CO2-rich natural gas into liquid fuel, the process comprising:a) introducing a CO2-rich natural gas feed stream into a synthesis gas formation reactor; b) forming a synthesis gas in the synthesis gas formation reactor; c) introducing at least a portion of the synthesis ga
1. A process for converting CO2-rich natural gas into liquid fuel, the process comprising:a) introducing a CO2-rich natural gas feed stream into a synthesis gas formation reactor; b) forming a synthesis gas in the synthesis gas formation reactor; c) introducing at least a portion of the synthesis gas into a Fischer-Tropsch reactor; d) conducting a Fischer-Tropsch process on the synthesis gas and generating a Fischer-Tropsch product comprising C5+ components; e) separating a naphtha from the Fischer-Tropsch product and recovering a C10+ product; f) introducing the naphtha into a naphtha reformer; g) generating hydrogen by-product by reforming the naphtha to obtain a C6-C10 product having a hydrogen to carbon ratio of less than about 2.0; h) recirculating at least a portion of the hydrogen by-product and mixing the hydrogen by-product with the CO2-rich natural gas feed stream, converting at least a portion of the CO2 present in the CO2-rich natural gas feed stream into additional CO by a reverse water gas shift reaction so that the synthesis gas derived from the feed stream contains a volume amount of CO2 that is less than a volume amount of CO2 present in the feed stream prior to mixing with the hydrogen by-product; and i) converting the additional CO into hydrocarbons in the Fischer-Tropsch reactor. 2. The process of claim 1, further comprising separating the Fischer-Tropsch product into at least unreacted gases comprising CO H2 and CO2, the naphtha and a C10+ product, the C10+ product having a hydrogen to carbon ratio of about 2.0.3. The process of claim 2, further comprising recirculating at least a portion of the unreacted gases so that the unreacted gases mix with the synthesis gas before the synthesis gas enters the Fischer-Tropsch reactor.4. The process of claim 1, wherein the C6-C10 product has a hydrogen to carbon ratio that is less than about 1.95.5. The process of claim 1, wherein the C6-C10 product has a hydrogen to carbon ratio that is less than about 1.90.6. The process of claim 1, wherein the C6-C10 product has a lower hydrogen to carbon ratio than the C10+ product.7. A process for converting CO2 in a natural gas to hydrocarbons, the process comprising:a) reforming a Fischer-Tropsch naphtha to obtain a C6-C10 product and a hydrogen by-product; b) reacting the hydrogen by-product with CO2 in a natural gas feed stream being fed into a synthesis gas formation reactor to produce a synthesis gas used to obtain the Fischer-Tropsch naphtha, so that a reverse water gas shift reaction occurs converting the CO2 into additional CO; and c) converting the additional CO into hydrocarbons in a Fischer-Tropsch reactor, so that a volume amount of CO2 in the synthesis gas is less than a volume amount of CO2 present in the natural gas feed stream prior to reacting with the hydrogen by-product. 8. The process of claim 7, wherein the amount of CO2 is reduced so that the amount of CO2 in the synthesis gas, derived from the natural gas feed stream and used to obtain the Fischer-Tropsch naphtha, is about 10 mol % or less.9. The process of claim 7, wherein the amount of CO2 is reduced so that the amount of CO2 in the synthesis gas, derived from the natural gas feed stream and used to obtain the Fischer-Tropsch naphtha, is about 7 mol % or less.10. The process of claim 7, wherein the amount of CO2 is reduced so that the amount of CO2 in the synthesis gas, derived from the natural gas feed stream and used to obtain the Fischer-Tropsch naphtha, is about 5 mol % or less.11. The process of claim 7, wherein said C6-C10 product has a hydrogen to carbon ratio of less than about 2.0.12. A process for converting a natural gas into liquid fuel, the process comprising:a) introducing a natural gas feed stream comprising CO2 and CH4 into a synthesis gas formation reactor; b) generating a synthesis gas comprising CO, H2 and CO2 in the synthesis gas formation reactor; c) introducing the synthesis gas into a Fischer-Tropsch reactor; d) performing a Fischer-Tropsch process on the synthesis gas to produce a Fischer-Tropsch product; e) separating the Fischer-Tropsch product into unreacted CO, H2 and CO2, a C1-C5 product having a hydrogen to carbon ratio of about 2.0, a naphtha, and a C10+ product, the C10+ product having a hydrogen to carbon ratio of about 2.0; f) reforming the naphtha to generate hydrogen by-product and C6-C10 product with a hydrogen to carbon ratio of less than about 2.0; and g) mixing the hydrogen by-product with the natural gas feed stream so that at least a portion of the CO2 present in the natural gas feed stream is converted into additional CO by a reverse water gas shift reaction so that the synthesis gas derived from the feed stream contains a volume amount of C2 that is less than a volume amount of CO2 present in the natural gas feed stream prior to being mixed with the hydrogen by-product; and h) converting the additional CO into hydrocarbons in the Fischer-Tropsch reactor. 13. A process for converting CO2 in a natural gas to hydrocarbons, the process comprising:a) generating hydrogen by-product by reforming a Fischer-Tropsch naphtha using at least one of a conventional naphtha reforming reaction and a non-acidic zeolitic reforming reaction to obtain a C6-C10 product having a hydrogen to carbon ratio of less than about 2.0; b) reacting the hydrogen by-product with C2 in a natural gas feed stream being used to obtain a synthesis gas used to obtain the Fischer-Tropsch naphtha, so that a reverse water gas shift reaction occurs converting the CO2 into additional CO; and c) converting the additional CO into hydrocarbons in a Fischer-Tropsch reactor, so that a volume amount of CO2 in the synthesis gas used to obtain the Fischer-Tropsch naphtha is less than a volume amount of CO2 in the natural gas feed stream prior to reacting with the hydrogen by-product. 14. A process for reducing an amount of CO2 present in a natural gas feed stream, the process comprising:a) introducing a natural gas feed stream comprising CH4 and CO2 into a synthesis gas formation reactor, b) forming a synthesis gas comprising CO, H2 and CO2 in the synthesis gas formation reactor; c) introducing at least a portion of the synthesis gas into a Fischer-Tropsch reactor; d) performing a Fischer-Tropsch process on the synthesis gas to obtain a Fischer-Tropsch product; e) introducing the Fischer-Tropsch product into a first separator and separating unreacted gases, comprising CO, H2 and CO2, and hydrocarbon products, from the Fischer-Tropsch product; f) feeding at least a portion of the unreacted gases into the synthesis gas being fed into the Fischer-Tropsch reactor; g) separating the hydrocarbon products from the Fischer-Tropsch reactor into a C1-C5 product having a hydrogen to carbon ratio of at least about 2.0, a naphtha and a C10+ product, the C10+ product having a hydrogen to carbon ratio of about 2.0; h) introducing the naphtha into a naphtha reformer; i) generating hydrogen by-product by reforming the naphtha in the reformer to produce a C6-C10 product with a hydrogen to carbon ratio of less than about 2.0; and j) recirculating the hydrogen by-product so that the hydrogen by-product mixes with the natural gas feed stream so that the hydrogen by-product reacts with at least a portion of the CO2 present in the feed stream so that the CO2 is converted into additional CO by a reverse water gas shift reaction so that the synthesis gas derived from the feed stream contains a volume amount of CO2 that is less than a volume amount of CO2 present in the feed stream prior to mixing with the hydrogen by-product; and k) converting the additional CO into hydrocarbons in the Fischer-Tropsch reactor. 15. A process for using CO2 in a natural gas to prepare hydrocarbons, the process comprising:a) reforming a Fischer-Tropsch naphtha using at least one of a conventional naphtha reforming reaction or a non-acidic zeolitic reforming reaction to obtain a C6-C10 product having a hydrogen to carbon ratio of less than about 2.0 and hydrogen by-product, and b) reacting the hydrogen by-product with CO2 in a natural gas so that a reverse water gas shift reaction occurs converting the CO2 into CO; and c) converting the CO into hydrocarbons in a Fischer-Tropsch reactor. 16. The process of claim 15, wherein the Fischer-Tropsch naphtha is derived from a synthesis gas obtained from the natural gas.17. The process of claim 16, wherein a volume amount of CO2 in the synthesis gas used to produce the Fischer-Tropsch naphtha is less than a volume amount of CO2 present in the natural gas prior to reacting with the hydrogen by-product.
Bonneau Reynald,FRX ; Clerici Mario-Gabriele,ITX ; Viltard Jean-Charles,FRX, Process for synthesis at atmospheric distillate that comprises the use of Fischer-Tropsch technology.
Joshi, Mahendra Ladharam; Cui, Jingyu; Buehrman, Frederik Arnold; Wellington, Scott Lee, Method for recovering a natural gas contaminated with high levels of CO2 .
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