EP0284448A1
Expired / Lapsed
EP
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High purity nitrogen producing method
Assignee: Kobe Steel Ltd
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Filing: 1988-01-19
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Granted: —
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Expires: 2008-01-19
Abstract
Abstract A high purity nitrogen producing method used in a pressure swing adsorption method including the steps of introducing a raw material gas containing N₂ as a principal component and O₂ into an adsorption column, adsorbing the N₂ by an adsorbent, and reducing pressure in the adsorption column to desorb and recover the N₂ having a high purity, characterized in that a synthetic zeolite is used as the adsorbent, and that an average contact time T (unit : sec) as expressed by T : L/V is not greater than 30 sec, where L is a filling length (unit : m) of the adsorbent, and V is an average superficial velocity (unit : m/sec) of a raw material gas in an adsorption column in an adsorption step. Also disclosed a high purity nitrogen producing device characterized in that a synthetic zeolite having an adjusted hole diameter of 7 - 10 A is filled in the adsorption column.
Inventors
- 👤 Ichiro Funada
- 👤 Toshio Mita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 03:04
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/06; B01D53/04; B01D53/047; B01D53/0476; B01D53/0473; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; C; C01; C01B; C01B21/00; C01B21/04; C01B21/0405; C01B21/0433; C01B21/045; C01B21/0455; C01B21/0466; B01D2253/00; B01D2253/10; B01D2253/106; B01D2253/108; B01D2253/30; B01D2253/302; B01D2253/308; B01D2253/31; B01D2256/00; B01D2256/10; B01D2256/12; B01D2257/00; B01D2257/10; B01D2257/102; B01D2259/00; B01D2259/40; B01D2259/402; B01D2259/403; Y; Y02; Y02C; Y02C20/00; Y02C20/40; Y02P; Y02P20/00; Y02P20/151
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
1 o - A high purity nitrogen producing method used in a pressure swing adsorption method including the steps of introducing a raw material gas containing N₂ as a principal component and O₂ into an adsorption column, adsorbing the N₂ by an adsorbent, and reducing pressure in said adsorption column to desorb and recover the N₂ having a high purity, characterized in that a synthetic zeolite is used as said adsorbent, and that an average contact time T (unit : sec) as expressed by T = L/V is not greater than 30 sec, where L is a filling length (unit : m) of said adsorbent, and V is an average superficial velocity (unit : m/sec) of a raw material gas in an adsorption column in an adsorption step.
Claim 2
Dependent Claim
128 words
1 o - A high purity nitrogen producing method used in a pressure swing adsorption method including the steps of introducing a raw material gas containing N₂ as a principal component and O₂ into an adsorption column, adsorbing the N₂ by an adsorbent, and reducing pressure in said adsorption column to desorb and recover the N₂ having a high purity, characterized in that a synthetic zeolite is used as said adsorbent, and that an average contact time T (unit : sec) as expressed by T = L/V is not greater than 30 sec, where L is a filling length (unit : m) of said adsorbent, and V is an average superficial velocity (unit : m/sec) of a raw material gas in an adsorption column in an adsorption step.
Claim 3
Dependent Claim
27 words
2 o - The high purity nitrogen producing method as defined in claim 1, wherein said synthetic zeolite has a hole diameter of 7 - 10 A.
Claim 4
Dependent Claim
36 words
3 o - The high purity nitrogen producing method as defined in claim 2, wherein said synthetic zeolite having the hole diameter of 7 - 10 A occupies 95% or more in the percentage of distribution.
Claim 5
Dependent Claim
84 words
4 o - The high purity nitrogen producing method as defined in any one of claims 1 - 3, further comprising the steps of partially supplying said high purity N₂ produced as a washing gas to said adsorption column prior to the desorption step in said adsorption column, substituting a residual O₂ in said adsorption column by said washing gas, feeding an emission gas generated after the substitution to another adsorption column, and adsorbing N₂ in said emission gas by said another adsorption column.
Claim 6
Dependent Claim
49 words
5 o - The high purity nitrogen producing method as defined in any one of claims 1 - 4, wherein introduction of said raw material gas, said washing gas and said emission gas into said adsorption column is designed to maintain the same gas flow in said adsorption column.
Claim 7
Dependent Claim
62 words
6 o - A high purity nitrogen producing device, used in a pressure swing adsorption device for adsorbing N₂ by an adsorbent in an adsorption column, desorbing the N₂ under reduced pressure, and recovering the N₂ with a high purity, characterized in that a synthetic zeolite having an adjusted hole diameter of 7 - 10 A is filled in said adsorption column.
Claim 8
Dependent Claim
62 words
6 o - A high purity nitrogen producing device, used in a pressure swing adsorption device for adsorbing N₂ by an adsorbent in an adsorption column, desorbing the N₂ under reduced pressure, and recovering the N₂ with a high purity, characterized in that a synthetic zeolite having an adjusted hole diameter of 7 - 10 A is filled in said adsorption column.
Claim 9
Dependent Claim
37 words
7 o - The high purity nitrogen producing device as defined in claim 6, wherein said synthetic zeolite having the adjusted hole diameter of 7 - 10 A occupies 95% or more in the percentage of distribution.
References Cited (Backward Citations)
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