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 THEREOF

Info

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
Application number
AT94903999T
Other languages
German (de)
Inventor
Takahiro Kumonaka
Takema Hase
Tomoji Aotsuka
Toshio Kurihara
Yoshiyuki Nakamura
Tetsuo Matsui
Hiromichi Ishikawa
Uozakikitamachi
Fujio Kobayashi
Original Assignee
Senju Pharma Co
Welfide Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Senju Pharma Co, Welfide Corp filed Critical Senju Pharma Co
Priority claimed from PCT/JP1994/000005 external-priority patent/WO1995018805A1/en
Application granted granted Critical
Publication of ATE206121T1 publication Critical patent/ATE206121T1/en

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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.
AT94903999T 1980-02-12 1994-01-06 1,4-BENZOXAZINE-2-ACETIC ACID COMPOUND, METHOD FOR PRODUCTION THEREOF AND USE THEREOF ATE206121T1 (en)

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)

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