Patent ID: 11883775
Assignee: PRAXAIR TECHNOLOGY, INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 18:
19. 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.