Method and system for gas purification with first direct absorption step and second absorption step by means of membrane contactor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/18
B01D-053/14
B01D-053/22
C10L-003/10
출원번호
US-0005464
(2012-03-16)
등록번호
US-9155989
(2015-10-13)
우선권정보
NO-20110472 (2011-03-28)
국제출원번호
PCT/EP2012/054665
(2012-03-16)
§371/§102 date
20131216
(20131216)
국제공개번호
WO2012/123571
(2012-09-20)
발명자
/ 주소
Shah, Kamal C.
Nøkleby, Pål Helge
Vingelven, Geir
출원인 / 주소
AKER PROCESS SYSTEMS AG
대리인 / 주소
Wenderoth, Lind & Ponack, L.L.P.
인용정보
피인용 횟수 :
0인용 특허 :
3
초록▼
A method and system for purification of a pressurized gas stream, wherein the method includes in a first absorption step bringing the pressurized gas stream in direct contact with a first absorption solution absorbing at least part of the acidic gases, in the gas stream obtaining a gas liquid mixtur
A method and system for purification of a pressurized gas stream, wherein the method includes in a first absorption step bringing the pressurized gas stream in direct contact with a first absorption solution absorbing at least part of the acidic gases, in the gas stream obtaining a gas liquid mixture; and separating the gas liquid mixture in a partly purified pressurized gas stream and a first rich absorption solution. In a second downstream absorption step bringing the partly purified pressurized gas in contact with a second absorption solution through a membrane contactor, obtaining a second rich absorption solution and a purified pressurized gas stream. The first absorption solution is a partially lean absorption solution.
대표청구항▼
1. Method for purification of a pressurized gas stream comprising acidic gases, wherein the method comprises in a first absorption step bringing the pressurized gas stream in direct contact with a first absorption solution absorbing at least part of the acidic gases, resulting in a gas liquid mixtur
1. Method for purification of a pressurized gas stream comprising acidic gases, wherein the method comprises in a first absorption step bringing the pressurized gas stream in direct contact with a first absorption solution absorbing at least part of the acidic gases, resulting in a gas liquid mixture,separating the gas liquid mixture in a partly purified pressurized gas stream and a first rich absorption solution,in a second downstream absorption step bringing the partly purified pressurized gas in contact with a second absorption solution through a membrane contactor, obtaining a second rich absorption solution and a purified pressurized gas stream, andwherein the first absorption solution is a partially lean absorption solution. 2. Method according to claim 1, wherein the second absorption solution is a lean absorption solution. 3. Method according to claim 1, wherein the second absorption solution is a partially lean absorption solution and wherein the first and optionally also the second absorption solutions contain a physical absorbent. 4. Method according to claim 1, where the mixture is separated to the magnitude of the vapour pressure of the absorbent. 5. Method according to claim 1, further comprising obtaining the partially lean absorption solution by of the first rich absorption solution, or the second rich absorption stream or a mixture of the first and the second rich absorption solution. 6. Method according to claim 1, wherein the method further comprises cooling the gas liquid mixture before it is separated. 7. Method according to claim 1, wherein the method comprises in the first absorption step feeding the first absorption solution co-currently with the gas stream. 8. Method according to claim 1, wherein the method comprises in the first absorption step spraying the first absorption solution into the gas stream. 9. Method according to claim 1, wherein the method comprises washing the partly purified gas stream and or passing the partly purified gas stream through a demister. 10. Method according to claim 1, wherein the method comprises controlling the pressure over the membrane to maintain a stable overpressure on the gas feed side. 11. Method according to claim 1, wherein the method further comprises mixing lean absorbent into the partially lean absorbent upstream the first absorption step. 12. Method according to claim 1, wherein the method further comprises cooling the partially lean absorbent upstream the first absorption step. 13. Method according to claim 10, where the pressure is controlled utilizing a pressure equalizing line connecting the partly purified pressurized gas via a filter with an absorbent buffer tank arranged downstream the second absorption step. 14. Method according to claim 5, wherein the method comprises controlling the pressure over the membrane to maintain a stable overpressure on the gas feed side, wherein the pressure is controlled by regulating a flow between the first rich absorption solution and the second rich absorption solution upstream the depressurization step obtaining the partially lean absorption. 15. System for purification of a pressurized gas stream comprising acidic gases, wherein the system comprises a first direct absorber unit comprising a gas inlet, an absorbent solution inlet and a gas liquid mixture outlet,a separation unit comprising a gas outlet, a rich absorbent solution outlet and an inlet connected to the gas liquid mixture outlet,a flash desorber unit comprising a desorbed gas outlet, a partially lean absorbent outlet in fluid communication with the absorbent solution inlet of the first absorption unit and an inlet in fluid communication with the rich absorbent solution outlet of the separation unit,a second membrane absorber unit comprising on a first side of the membrane a gas inlet in fluid communication with the gas outlet of the separation unit, a purified gas outlet, and comprising on a second side of the membrane a lean absorbent solution inlet and a rich absorbent solution outlet. 16. System according to claim 15, wherein the first direct absorber unit is combined with the separation unit forming a combined first direct absorber separation unit comprising in a lower part the gas inlet, the absorbent solution inlet and the rich absorbent outlet, and in a upper part the gas outlet. 17. System for purification according to claim 15, wherein the inlet of the flash desorber is also in fluid communication with the rich absorbent solution outlet of the second membrane absorber. 18. System for purification according to claim 15, wherein the separation unit or the upper part of the combined absorber and separation unit further comprises a chimney tray and a system for introduction and recycling of a wash liquid. 19. System for purification according to claim 15, wherein the separation unit or the upper part of the combined absorber and separation unit further comprises a demister. 20. System for purification according to claim 15, wherein the system further comprises a pressure buffer tank and a pressure equalization conduit in fluid communication with the rich absorbent outlet from the second membrane absorber and the separation unit or the combined absorption and separation unit or the gas outlet of the separation unit or the combined absorption and separation unit. 21. System for purification according to claim 15, wherein the system further comprises one or more coolers arranged up stream the inlet to the separation unit or the inlets to the combined absorber and separation unit and or the absorbent solution inlet to the first direct absorber unit.
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이 특허에 인용된 특허 (3)
Falk-Pedersen Olav,NOX ; Dannstrom Henrik,NOX, Method for removing carbon dioxide from gases.
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