Methods and systems for selectively separating COfrom a multicomponent gaseous stream to produce a high pressure COproduct
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/14
B01D-053/78
출원번호
US-0869457
(2004-06-15)
발명자
/ 주소
Spencer,Dwain F.
출원인 / 주소
Spencer,Dwain F.
대리인 / 주소
Bozicevic, Field &
인용정보
피인용 횟수 :
81인용 특허 :
9
초록▼
Methods are provided for the selective removal of CO2 from a multicomponent gaseous stream to provide a CO2 depleted gaseous stream. In practicing the subject methods, an initial multicomponent gaseous stream is contacted with an aqueous fluid under conditions of selective CO2 clathrate formation t
Methods are provided for the selective removal of CO2 from a multicomponent gaseous stream to provide a CO2 depleted gaseous stream. In practicing the subject methods, an initial multicomponent gaseous stream is contacted with an aqueous fluid under conditions of selective CO2 clathrate formation to produce a CO2 clathrate slurry and CO2 depleted gaseous stream. A feature of the subject methods is that the CO2 clathrate slurry is then compressed to high pressure to produce a high-pressure CO2 product. Also provided are systems that find use in practicing the subject methods. The subject methods and systems find use in a variety of applications where it is desired to selectively remove CO2 from a multicomponent gaseous stream.
대표청구항▼
What is claimed is: 1. A method for removing CO2 from a multicomponent gaseous stream to produce a CO2 depleted gaseous stream and a high pressure CO2 product, said method comprising: (a) contacting a multicomponent gaseous stream with an aqueous fluid under conditions sufficient to produce CO2 hy
What is claimed is: 1. A method for removing CO2 from a multicomponent gaseous stream to produce a CO2 depleted gaseous stream and a high pressure CO2 product, said method comprising: (a) contacting a multicomponent gaseous stream with an aqueous fluid under conditions sufficient to produce CO2 hydrates, whereby CO2 is removed from said gaseous stream by said aqueous fluid and concomitantly fixed as CO2 clathrates upon said contacting to produce a CO2 depleted gaseous stream and a CO2 clathrate slurry; (b) separating said CO2 depleted gaseous stream from said CO2 clathrate slurry to remove CO2 from said multicomponent gaseous stream; and (c) compressing said CO2 clathrate slurry at a first pressure to a second pressure that is higher than said first pressure to produce said high-pressure CO2 clathrate slurry product, wherein said second pressure is at least about 10 times higher than said first pressure. 2. The method according to claim 1, wherein said second pressure ranges from about 20 to about 100 atm. 3. The method according to claim 1, wherein said first pressure ranges from about 0.5 to about 10 atm. 4. The method according to claim 1, wherein said aqueous fluid is CO2 nucleated water. 5. The method according to claim 4, wherein said aqueous fluid of said contacting step comprises a CO2 hydrate promoter. 6. The method according to claim 5, wherein said CO2 hydrate promoter is a low molecular weight compound. 7. The method according to claim 6, wherein said low molecular weight compound is an organic salt. 8. The method according to claim 7, wherein said organic salt is an alkyl-onium salt. 9. The method according to claim 1, wherein said contacting step occurs in a reactor having a heat transfer surface area sufficient to transfer substantially all of said heat of formation energy produced by clathrate formation in said reactor to a coolant medium. 10. The method according to claim 9, wherein said reactor has a length to diameter ratio (L/D) that ranges from about 500 to about 2000. 11. The method according to claim 1, wherein said separating step (b) occurs in a low-pressure liquid/gas separator. 12. A method for removing CO2 from a multicomponent gaseous stream to produce a CO2 depleted gaseous stream and a high pressure CO2 product, said method comprising: (a) contacting a multicomponent gaseous stream with an aqueous fluid under conditions sufficient to produce CO2 hydrates, whereby CO2 is removed from said gaseous stream by said aqueous fluid and concomitantly fixed as CO2 clathrates upon said contacting to produce a CO2 depleted gaseous stream and a CO2 clathrate slurry; (b) separating said CO2 depleted gaseous stream from said CO2 clathrate slurry to remove CO2 from said multicomponent gaseous stream; and (c) compressing said CO2 clathrate slurry at a first pressure to a second pressure that is higher than said first pressure to produce said high-pressure CO2 clathrate slurry product, wherein said method further comprises recovering compression energy from said CO2 depleted gaseous stream produced by said separating step (b) and wherein said separating step (b) occurs in a low-pressure liquid/gas separator. 13. The method according to claim 1, wherein said method further comprises reducing the temperature and increasing the pressure of said multicomponent gaseous stream prior to said contacting step (a). 14. The method according to claim 1, wherein said method further comprises producing CO2 gas from said high-pressure CO2 product. 15. A method for removing CO2 from a multicomponent gaseous stream to produce a CO2 depleted gaseous stream and a high pressure CO2 product, said method comprising: (a) contacting a multicomponent gaseous stream with an aqueous fluid under conditions sufficient to produce CO2 hydrates, whereby CO2 is removed from said gaseous stream by said aqueous fluid and concomitantly fixed as CO2 clathrates upon said contacting to produce a CO2 depleted gaseous stream and a CO2 cladhrate slurry; (b) separating said CO2 depleted gaseous stream from said CO2 clathrate slurry to remove CO2 from said multicomponent gaseous stream; and (c) compressing or pumping said CO2 clathrate slurry at a first pressure to a second pressure that is higher than said first pressure to produce said high-pressure CO2 clathrate slurry product, wherein said method further comprises producing CO2 gas from said high-pressure CO2 product and wherein heat of formation energy obtained from said contacting step (a) is employed to produce CO2 gas from said high-pressure CO2 product. 16. The method according to claim 15, wherein said CO2 gas is produced from said high-pressure CO2 product by flashing said high pressure CO2 product. 17. The method according to claim 14, wherein said method further comprises compressing said CO2 gas to a third pressure that is higher than said second pressure. 18. The method according to claim 17, wherein said third pressure ranges from about 100 to about 150 atm. 19. The method according to claim 14, wherein said CO2 gas producing step also produces an aqueous byproduct that is recycled for use in further CO2 hydrate formation. 20. A method for removing CO2 from a multicomponent gaseous stream to produce a CO2 depleted gaseous stream and a high pressure CO2 product, said method comprising: (a) contacting a multicomponent gaseous stream with an aqueous fluid under conditions sufficient to produce CO2 hydrates, whereby CO2 is removed from said gaseous stream by said aqueous fluid and concomitantly fixed as CO2 clathrates upon said contacting to produce a CO2 depleted gaseous stream and a CO2 clathrate slurry; (b) separating said CO2 depleted gaseous stream from said CO2 clathrate slurry to remove CO2 from said multicomponent gaseous stream; and (c) compressing or pumping said CO2 clathrate slurry at a first pressure to a second pressure that is higher than said first pressure to produce said high-pressure CO2 clathrate slurry product. wherein said method further comprises producing CO2 gas from said high-pressure CO2 product; wherein said CO2 gas producing step also produces an aqueous byproduct that is recycled for use in further CO2 hydrate formation; and wherein said method comprises recovering compression energy from said aqueous byproduct. 21. A method for removing CO2 from a multicomponent gaseous stream to produce a CO2 depleted gaseous stream and a high pressure CO2 product, said method comprising: (a) contacting a multicomponent gaseous stream with an aqueous fluid under conditions sufficient to produce CO2 hydrates, whereby CO2 is removed from said gaseous stream by said aqueous fluid and concomitantly fixed as CO2 clathrates upon said contacting to produce a CO2 depleted gaseous stream and a CO2 clathrate slurry; (b) separating said CO2 depleted gaseous stream from said CO2 clathrate slurry to remove CO2 from said multicomponent gaseous stream; and (c) compressing said CO2 clathrate slurry at a first pressure to a second pressure that is higher than said first pressure to produce said high-pressure CO2 clathrate slurry product; (d) decomposing said high-pressure clathrate slurry product to produce CO2 product gas; and (e) increasing the pressure of the CO2 product gas to a third pressure that is higher than said second pressure.
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