ATE206121T1 - 1,4-BENZOXAZINE-2-ACETIC ACID COMPOUND, METHOD FOR PRODUCTION THEREOF AND USE THEREOF - Google Patents
1,4-BENZOXAZINE-2-ACETIC ACID COMPOUND, METHOD FOR PRODUCTION THEREOF AND USE THEREOFInfo
- Publication number
- ATE206121T1 ATE206121T1 AT94903999T AT94903999T ATE206121T1 AT E206121 T1 ATE206121 T1 AT E206121T1 AT 94903999 T AT94903999 T AT 94903999T AT 94903999 T AT94903999 T AT 94903999T AT E206121 T1 ATE206121 T1 AT E206121T1
- Authority
- AT
- Austria
- Prior art keywords
- elements
- gas
- water
- oxygen
- release pressure
- Prior art date
Links
Landscapes
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
Gas diffusion elements, formed of a body of solid particles which has been shaped, pressed and rendered coherent by bonding or sintering in a compacted form having pores, and having an enhanced apparent volumetric compression ratio in a central zone thereof, are disclosed. Such elements have a generally horizontal portion including an upper gas discharge surface having a bubble release pressure in water, by a test disclosed herein, in the range of about 2 to about 20 inches of water. Among the preferred embodiments is an element whose gas discharge surface has the property that its coefficient of variation is not greater than about 0.25, based on the values of bubble release pressure at a plurality of points over said surface. Such elements may provide improved gas, e.g. oxygen, transfer efficiency, and therefore hold promise of improving the efficiency and economics of gas transfer processes, such as for instance treatment of sewage or other waste water with air, oxygen and/or ozone.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA000345502A CA1143367A (en) | 1980-02-12 | 1980-02-12 | Diffusion element |
PCT/JP1994/000005 WO1995018805A1 (en) | 1992-09-21 | 1994-01-06 | 1,4-benzoxazine-2-acetic acid compound, process for producing the same, and use thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
ATE206121T1 true ATE206121T1 (en) | 2001-10-15 |
Family
ID=37709769
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT94903999T ATE206121T1 (en) | 1980-02-12 | 1994-01-06 | 1,4-BENZOXAZINE-2-ACETIC ACID COMPOUND, METHOD FOR PRODUCTION THEREOF AND USE THEREOF |
Country Status (3)
Country | Link |
---|---|
AT (1) | ATE206121T1 (en) |
CA (1) | CA1143367A (en) |
DE (1) | DE69428457D1 (en) |
-
1980
- 1980-02-12 CA CA000345502A patent/CA1143367A/en not_active Expired
-
1994
- 1994-01-06 DE DE69428457T patent/DE69428457D1/en not_active Expired - Lifetime
- 1994-01-06 AT AT94903999T patent/ATE206121T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE69428457D1 (en) | 2001-10-31 |
CA1143367A (en) | 1983-03-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
RER | Ceased as to paragraph 5 lit. 3 law introducing patent treaties |