Rate/kinetic selective multiple bed adsorption process cycle
AssigneePraxair Technology, Inc.
InventorsNicholas R. Stuckert, Michael St. James
Life of this patent
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Abstract
The present invention is directed to an intensified process cycle that utilizes the adsorption beds present to a substantially greater degree allowing the processing of significantly more gas and/or the generation of significantly more product. The elimination of purge steps, reduction in equalization step times, and introduction of overlapping feed and equalization steps which normally cause a degradation in performance for equilibrium-based cycles, frees extra step for other actions to be taken, such as additional equalization steps, etc.
Claims19
A pressure swing adsorption process for separating a pressurized feed supply gas containing at least one more rapidly adsorbable component and at least one less rapidly adsorbable product gas component which comprises continuous feeding of a supply gas into a feed input end of an adsorber bed containing at least one solid adsorbent which kinetically adsorbs the more rapidly adsorbable component and withdrawing the least rapidly adsorbable component from an exit end of the adsorber bed, which has at least 2 beds in service in which the continuous feeding of the supply gas sequentially through each of the adsorber beds produces product gas by using continuous feed gas, a constant product gas step, a product pressurization step, a high pressure equalization step, a product make step that overlaps with feeding the bed, at least one equalization up step and at least one low pressure equalization down step, a blow down step to depressurize the bed, wherein there is no purge provided to any bed during any step in the PSA process.
A pressure swing adsorption process for separating a pressurized feed supply gas containing N2 and methane which comprises continuous feeding said supply gas into a feed input end of an adsorber bed containing at least one solid adsorbent which kinetically adsorbs N2 and withdrawing the methane having a reduced amount of N2 from an exit end of the adsorber bed, which has at least 2 beds in service in which the continuous feeding of the supply gas sequentially through each of the adsorber beds produces product methane gas by using continuous feed gas, a constant product gas step, a product pressurization step, a high pressure equalization step, a product make step that overlaps with feeding the bed, at least one equalization up step and at least one low pressure equalization down step, a blow down step to depressurize the bed, wherein there is substantially no purge provided to any bed during any step in the PSA process.
A pressure swing adsorption process for separating a pressurized feed supply gas containing at least one more rapidly adsorbable component and at least one less rapidly adsorbable product gas component in a four bed system which comprises the continuous feeding of a supply gas into a feed input end of an adsorber bed containing at least one solid adsorbent which preferentially adsorbs the more rapidly adsorbable component and withdrawing the least rapidly adsorbable product gas component from an exit end of the adsorber bed in a sixteen-step cycle following the cycle chart:
- 4-1-3-1e
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 1
- BD
- BD
- BD
- EQU3
- EQU2
- EQU2
- EQU1/F
- PP/F
- 2
- EQD2
- EQD2
- X
- EQD3
- BD
- BD
- BD
- EQU3
- 3
- F
- F
- EQD1
- X
- EQD2
- EQD2
- XD
- EQD3
- 4
- EQU2
- EQU2
- EQU1/F
- PP/F
- F
- F
- EQD1
- X
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 1
- F
- F
- EQD1
- X
- EQD2
- EQD2
- X
- EQD3
- 2
- EQU2
- EQU2
- EQU1/F
- PP/F
- F
- F
- EQD1
- X
- 3
- BD
- BD
- BD
- EQU3
- EQU2
- EQU2
- EQU1/F
- PP/F
- 4
- EQD2
- EQD2
- X
- EQD3
- BD
- BD
- BD
- EQU3
- wherein:
- F—feed step and make product if at pressure
- EQD1—first equalization down
- EQD2—second equalization down
- EQD3—third equalization down
- X—Idle step
- BD—bed blow down/vent
- EQU3—third equalization up
- EQU2—second equalization up
- EQU1/F—first equalization up, overlap feed
- PP/F—product pressurization, overlap feed.
A pressure swing adsorption process for separating a pressurized feed supply gas containing at least one more rapidly adsorbable component and at least one less rapidly adsorbable product gas component in a four bed system which comprises the continuous feeding of a supply gas into a feed input end of an adsorber bed containing at least one solid adsorbent which preferentially adsorbs the more rapidly adsorbable component and withdrawing the least rapidly adsorbable product gas component from an exit end of the adsorber bed in a sixteen-step cycle following the cycle chart:
- 4-1-2-2
- Step
- Bed
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 1
- F
- F
- EQD1
- X
- X
- EQD2
- BD
- BD
- BD
- BD
- BD
- BD
- BD
- EQU2
- EQU1/F
- F
- 2
- BD
- EQU2
- EQU1/F
- F
- F
- F
- EQD1
- X
- X
- EQD2
- BD
- BD
- BD
- BD
- BD
- BD
- 3
- BD
- BD
- BD
- BD
- BD
- EQU2
- EQU1/F
- F
- F
- F
- EQD1
- X
- X
- EQD2
- BD
- BD
- 4
- X
- EQD2
- BD
- BD
- BD
- BD
- BD
- BD
- BD
- EQU2
- EQU1/F
- F
- F
- F
- EQD1
- X
- wherein:
- F—feed step and make product if at pressure
- EQD1—first equalization down
- EQD2—second equalization down
- EQD3—third equalization down
- X—Idle step
- BD—bed blow down/vent
- EQU3—third equalization up
- EQU2—second equalization up
- EQU1/F—first equalization up, overlap feed
- PP/F—product pressurization, overlap feed.
A pressure swing adsorption process for separating a pressurized feed supply gas containing at least one more rapidly adsorbable component and at least one less rapidly adsorbable product gas component in a four bed system which comprises the continuous feeding of a supply gas into a feed input end of an adsorber bed containing at least one solid adsorbent which preferentially adsorbs the more rapidly adsorbable component and withdrawing the least rapidly adsorbable product gas component from an exit end of the adsorber bed in a sixteen-step cycle following the cycle chart:
- 4-2-2-1
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 1
- F
- F
- F
- F
- F
- F
- EQD1
- X
- X
- EQD2
- BD
- BD
- BD
- EQU2
- EQU1/F
- F
- 2
- BD
- EQU2
- EQU1/F
- F
- F
- F
- F
- F
- F
- F
- EQD1
- X
- X
- EQD2
- BD
- BD
- 3
- X
- EQD2
- BD
- BD
- BD
- EQU2
- EQ1/F
- F
- F
- F
- F
- F
- F
- F
- EQD1
- X
- 4
- F
- F
- EQD1
- X
- X
- EQD2
- BD
- BD
- BD
- EQU2
- EQU1/F
- F
- F
- F
- F
- F
- wherein:
- F—feed step and make product if at pressure
- EQD1—first equalization down
- EQD2—second equalization down
- EQD3—third equalization down
- X—Idle step
- BD—bed blow down/vent
- EQU3—third equalization up
- EQU2—second equalization up
- EQU1/F—first equalization up, overlap feed
- PP/F—product pressurization, overlap feed.
Dependencies are inferred from the claim text.