High purity olefinic naphthas for the production of ethylene and propylene
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C10G-009/00
C07C-001/04
C07C-001/00
출원번호
US-0355158
(2003-01-31)
발명자
/ 주소
O'Rear,Dennis J.
Lei,Guan Dao
출원인 / 주소
Chevron U.S.A. Inc.
대리인 / 주소
Buchanan, Ingersoll &
인용정보
피인용 횟수 :
7인용 특허 :
27
초록▼
The present invention relates to an olefinic naphtha and a process for producing lower olefins from this naphtha. In the process of the present invention for producing lower olefins, preferably ethylene, at least a portion of a hydrocarbon asset is converted to synthesis gas and at least a portion o
The present invention relates to an olefinic naphtha and a process for producing lower olefins from this naphtha. In the process of the present invention for producing lower olefins, preferably ethylene, at least a portion of a hydrocarbon asset is converted to synthesis gas and at least a portion of the synthesis gas is converted to an olefinic naphtha by a Fischer-Tropsch process. At least a portion of the olefinic naphtha is converted in a naphtha cracker to a product stream comprising lower olefins, and at least a portion of the lower olefins from the product stream of the naphtha cracker are recovered.
대표청구항▼
That which is claimed is: 1. A process for producing lower olefins comprising: a. converting at least a portion of a hydrocarbon asset to synthesis gas; b. converting at least a portion of the synthesis gas to an olefinic naphtha by a Fischer-Tropsch process; c. converting at least a portion of the
That which is claimed is: 1. A process for producing lower olefins comprising: a. converting at least a portion of a hydrocarbon asset to synthesis gas; b. converting at least a portion of the synthesis gas to an olefinic naphtha by a Fischer-Tropsch process; c. converting at least a portion of the olefinic naphtha in a thermal naphtha cracker to a product stream comprising lower olefins; and, d. recovering at least a portion of the lower olefins from the product stream of the thermal naphtha cracker. 2. A process according to claim 1, wherein the olefinic naphtha has a total acid number of less than 1.5. 3. A process according to claim 1, further comprising the step of purifying the olefinic naphtha to reduce dissolved solids and acids therein to provide a purified naphtha. 4. A process according to claim 3, wherein the purified olefinic naphtha has a total acid number of less than 0.5. 5. A process according to claim 3, wherein the purifying step is performed by contacting the olefinic naphtha with a metal oxide at elevated temperatures. 6. A process according to claim 5, wherein the metal oxide is selected from the group consisting of alumina, silica, silica-alumina, zeolites, clays, and mixtures thereof. 7. A process according to claim 3, further comprising the step of separating water and carbon dioxide formed in the purifying step from the purified naphtha. 8. A process according to claim 1, wherein the olefinic naphtha comprises 10 to 80 weight percent olefins and 20 to 90 weight percent non-olefins, wherein the non-olefins comprise greater than 50 weight percent paraffins. 9. A process according to claim 1, wherein the olefinic naphtha comprises 50 to 80 weight percent olefins and 20 to 50 weight percent non-olefins, wherein the non-olefins comprise greater than 50 weight percent paraffins. 10. A process according to claim 1, wherein the olefinic naphtha comprises less than 5 weight percent aromatics, less than 5 ppm sulfur, and less than 5 ppm nitrogen. 11. A process according to claim 8, wherein the olefins of the olefinic naphtha comprise greater than 50 weight % linear primary olefins. 12. A process according to claim 8 wherein the olefins of the olefinic naphtha comprise greater than 80 weight % linear primary olefins. 13. A process according to claim 1, further comprising the step of blending the olefinic naphtha with a naphtha selected from the group consisting of a hydrotreated Fischer-Tropsch derived naphtha, a hydrocracked Fischer-Tropsch derived naphtha, a hydrotreated petroleum derived naphtha, a hydrocracked petroleum derived naphtha, and combinations thereof to provide a blended naphtha and converting a least a portion of the blended naphtha in the thermal naphtha cracker. 14. A process for producing ethylene comprising: a. converting at least a portion of a hydrocarbon asset to synthesis gas; b. converting at least a portion of the synthesis gas to a hydrocarbon stream in a Fischer-Tropsch process unit; c. isolating an olefinic naphtha from the hydrocarbon stream, wherein the olefinic naphtha comprises 25 to 80 weight % olefins and 20 to 75 weight % non-olefins, wherein the non-olefins comprise greater than 75 weight % paraffins; d. purifying the olefinic naphtha in the presence of a metal oxide to provide a purified olefinic naphtha having a total acid number of less than 1.5; e. converting at least a portion of the purified olefinic naphtha in a thermal naphtha cracker to a product stream comprising ethylene; and f. recovering at least a portion of the ethylene from the product stream of the thermal naphtha cracker. 15. A process according to claim 14, wherein the olefins of the olefinic naphtha comprise greater than 50 weight % linear primary olefins, the non-olefins of the olefinic naphtha comprise greater than 90 weight % paraffins, and the paraffins have an i/n ratio of less than 1. 16. A process according to claim 14, wherein the purification step reduces the content of solids, acids, and alcohols in the olefinic naphtha. 17. A process according to claim 14, wherein the purified olefinic naphtha has a total acid number of less than 0.5. 18. A process according to claim 14, wherein the purification step is performed by passing the olefinic naphtha through a purification unit containing a metal oxide under conditions of 450 to 800째 F., less than 1000 psig, and 0.25 to 10 LHSV without added gaseous components. 19. A process according to claim 14, wherein the metal oxide is selected from the group consisting of alumina, silica, silica-alumina, zeolites, clays, and mixtures thereof. 20. A process for manufacturing ethylene including a first site and a second site, remote from each other, wherein the first site forms an olefinic Fischer-Tropsch naphtha to be used at the second site, the second site forming the ethylene, wherein the process comprises: a. receiving at the second site the olefinic Fischer-Tropsch naphtha, which is made by a process comprising: i. converting a hydrocarbon asset to syngas; ii. subjecting the syngas to Fischer-Tropsch synthesis to form hydrocarbonaceous products; iii. isolating the olefinic Fischer-Tropsch naphtha from the hydrocarbonaceous products; b. converting the olefinic naphtha in a thermal naphtha cracker to a product stream comprising ethylene; and c. isolating ethylene from the product stream of the thermal naphtha cracker. 21. A process according to claim 20, wherein the olefinic naphtha has a total acid number of less than 1.5. 22. A process according to claim 20, wherein the process to make the olefinic Fischer-Tropsch naphtha further comprises the step of purifying the olefinic naphtha to reduce the dissolved solids and acids therein to provide a purified naphtha. 23. A process according to claim 22, wherein the purified naphtha has a total acid number of less than 0.5. 24. A process according to claim 22, wherein the purifying is performed by contacting the olefinic naphtha with a metal oxide at elevated temperatures. 25. A process according to claim 24, wherein the metal oxide is selected from the group consisting of alumina, silica, silica-alumina, zeolites, clays, and mixtures thereof. 26. A process according to claim 20, wherein the olefinic naphtha comprises 50 to 80 weight percent olefins and 20 to 50 weight percent non-olefins, wherein the non-olefins comprise greater than 50 weight percent paraffins. 27. A process according to claim 20, further comprising the step of blending the olefinic naphtha with a naphtha selected from the group consisting of a hydrotreated Fischer-Tropsch derived naphtha, a hydrocracked Fischer-Tropsch derived naphtha, a hydrotreated petroleum derived naphtha, a hydrocracked petroleum derived naphtha, and combinations thereof to provide a blended naphtha and converting the blended naphtha in the thermal naphtha cracker.
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이 특허에 인용된 특허 (27)
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