IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0312177
(2005-12-20)
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등록번호 |
US-7591879
(2009-10-20)
|
발명자
/ 주소 |
- Sundaram, Narasimhan
- Kaul, Bal K.
- Corcoran, Edward W.
- Sabottke, Craig Y.
- Eckes, Richard L.
|
출원인 / 주소 |
- ExxonMobil Research and Engineering Company
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
10 인용 특허 :
9 |
초록
▼
The present invention is a method for operating a rapid cycling pressure swing adsorption (RCPSA) having a cycle time, T, to separate a feed gas into a non-adsorbed gas and tail gas. The method includes the steps of passing the feed gas having a purity of F % at high pressure into a first end of a b
The present invention is a method for operating a rapid cycling pressure swing adsorption (RCPSA) having a cycle time, T, to separate a feed gas into a non-adsorbed gas and tail gas. The method includes the steps of passing the feed gas having a purity of F % at high pressure into a first end of a bed which selectively adsorbs the tail gas and passes the product gas out a second end of the bed for a time, F. The product gas has a purity, P %, and a rate of recovery of R %. Then the bed is cocurrently depressurized for a time, tCO, followed by countercurrently depressurizing the bed for a time, tCN. The bed is then purged for a time, tP, wherein desorbate (tail gas) is released at the first end of the bed at a pressure greater than 30 psig, Subsequently the bed is repressurized for a duration, tRP. R>80%, P/F≧1.1 or R≧90%, 0<P/F <1.1.
대표청구항
▼
What is claimed is: 1. A method for operating a rapid cycle pressure swing adsorption (RCPSA) system having a cycle time, tTOT, to separate a feed gas into product gas and tail (exhaust) gas with a high rate of recovery, comprising: (a) passing said feed gas having purity F % into a sorbent bed for
What is claimed is: 1. A method for operating a rapid cycle pressure swing adsorption (RCPSA) system having a cycle time, tTOT, to separate a feed gas into product gas and tail (exhaust) gas with a high rate of recovery, comprising: (a) passing said feed gas having purity F % into a sorbent bed for time, tF, which selectively adsorbs said tail gas and passes said product gas out of said bed, wherein said product gas has a purity of P % and a rate of recovery of R %, (b) co-currently depressurizing said bed for a time, tCO, (c) counter-currently depressurizing said bed for a time, tCN, (d) purging said bed for a time, tP, wherein desorbate (tail gas or exhaust gas) is released from said bed at a pressure greater than 30 psig, and (e) repressurizing the bed for a time, tRP, wherein the cycle time, tTOT, is equal to the sum of the individual cycle times comprising the total cycle time, tTOT=tF+tCO +tCN+tP+tRP and, wherein 0<tCO/tF≦1/3, and tCN/tF≦1/4, and 1/5≦tCO/tP, such that the rate of recovery, R %>80% for a product purity to feed purity ratio, P %/F %≧1.1, and/or a rate of recovery, R %>90% for a product purity to feed purity ratio, 0<P %/F %<1.1. 2. The method of claim 1 wherein said tail gas has a pressure greater than 60 psig. 3. The method of claim 1 wherein said product gas includes hydrogen. 4. The method of claim 1 wherein said product gas includes methane. 5. The method of claim 1 wherein said product gas includes an olefin. 6. The method of claim 1 wherein said product gas includes oxygen. 7. The method of claim 1 wherein said product gas includes nitrogen. 8. The method of claim 1 wherein said product gas includes helium. 9. The method of claim 1 wherein said product includes a saturate. 10. The method of claim 1 wherein said product includes CO2. 11. The method of claim 1 wherein said purity of said product gas is greater than 90%. 12. The method of claim 1 wherein said purity of said product gas is greater than 95%. 13. The method of claim 1 wherein said purity of said product gas is greater than 99%. 14. The method of claim 1 wherein the tail gas (exhaust gas) pressure is greater than 80 psig. 15. The method of claim 1 wherein the rate of recovery, R %≧85% for a product purity to feed purity ratio, P %/F %≧1.1, and/or a rate of recovery, R %≧95% for a product purity to feed purity ratio, 0<P %/F %<1.1. 16. The method of claim 1 wherein the rate of recovery, R %≧90% for a product purity to feed purity ratio, P %/F %≧1.1, and/or a rate of recovery, R %≧98% for a product purity to feed purity ratio, 0<P %/F %<1.1. 17. The method of claim 1 further comprising the step of feeding said tail gas into a refinery or petrochemical unit absent a tail gas compression. 18. The method of claim 17 wherein said refinery unit is a hydroprocessing unit, a reforming unit or a fluidized catalytic cracker unit. 19. The method of claim 17 wherein said petrochemical unit is a methanol synthesis unit. 20. The method of claim 1 wherein said step of depressuring said bed is only cocurrent flow such that tCN=0.
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