Mid-range purity oxygen by adsorption
AssigneePraxair Technology, Inc.
InventorsNicholas R. Stuckert, Yang Luo
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Abstract
The present invention relates to a process cycle that allows for the stable production of mid-range purity oxygen from air, using traditional system designs. Typical cycles have a limited production benefit when generating O2 at lower than 90% purity, however they suffer a production loss at higher purity. The process cycles of the invention are capable of producing significantly more contained O2 at a lower purity. In addition to enhanced production capacity, lower power consumed per mass of product and more stable product purity and flow are realized by the process of the invention compared to traditional alternatives.
Claims22
An adsorption process for the production of mid-range purity oxygen from a feed gas containing at least oxygen and nitrogen which comprises continuously feeding the feed gas into a feed input end of an adsorber bed containing at least one nitrogen selective adsorbent which preferentially adsorbs nitrogen and withdrawing oxygen from an exit end of said adsorber bed in a 14 step cycle following the cycle chart:
- STEP
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- C/AI
- C
- C/P
- C/P
- C/P
- EQDN
- EQDN/
- V
- V
- V
- PPG
- V
- EQUP
- EQUP
- PPG
- V
- V
- V
- C
- wherein C:
- Compressor/Pressurization, AI:
- Ambient Air Inlet, P:
- Product make/production/Adsorption, PPG:
- Provide Purge, V:
- Vacuum, EQUP:
- Equalize Up, EQDN:
- Equalize Down,
- and wherein the purge step in said cycle is stopped prior to stopping product make.
An adsorption process for the production of mid-range purity oxygen from a feed gas containing at least oxygen and nitrogen which comprises continuously feeding the feed gas into a feed input end of an adsorber bed containing at least one nitrogen selective adsorbent which preferentially adsorbs nitrogen and withdrawing oxygen from an exit end of said adsorber bed in a 14 step cycle, wherein purge is stopped prior to stopping product make.
An adsorption process for the production of mid-range purity oxygen having a purity of less than or equal to 75% from a feed gas containing at least oxygen and nitrogen, said process comprising continuously feeding the feed gas into a feed input end of an adsorber bed containing at least one nitrogen selective adsorbent which preferentially adsorbs nitrogen and withdrawing oxygen from an exit end of said adsorber bed in a 12 step cycle following the cycle chart:
- STEP
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- C/AI
- C
- C/P
- C/P/PPG
- C/P
- EQDN
- V
- V
- V
- PPG/V
- V
- EQUP/V
- wherein C:
- Compressor/Pressurization, AI:
- Ambient Air Inlet, P:
- Product production/Adsorption, PPG:
- Provide Purge, V:
- Vacuum, EQUP:
- Equalize Up, EQDN:
- Equalize Down,
- and wherein purge is stopped prior to stopping product make.
Dependencies are inferred from the claim text.