US4564373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for bubble-free gas feed
Assignee: Akzo NV
•
Filing: 1982-03-12
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Granted: 1986-01-14
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Expires: 2002-03-12
Abstract
Abstract A method for the bubble-free feed of gaseous reactants of a chemical and/or biological reaction into a liquid reaction medium, characterized by filling the pores of a porous polymer membrane with the reaction medium, providing one side of the porous polymer membrane with the gaseous reactants, and immersing the other side of the porous polymer membrane into the liquid reaction medium. The pressure of the gaseous reactants should lie below the bubble pressure determined for the reaction medium, but be at least so great that the liquid reaction medium does not pass through the porous polymer membrane to the gas side. Preferred parameters include relative pore volume between 50 and 90%; maximal pore diameter between 0.2 and 3 μm; and disposing the porous polymer membrane in the form of a flat membrane, tube or hollow filaments.
Inventors
- 👤 Franz J. Schmitz
- 👤 Rudi Wollbeck
- 👤 Wolfgang Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:44
CPC Classifications
C; C12; C12M; C12M29/00; C12M29/04; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/2319; B01J; B01J4/00; B01J4/04; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/20; C02F3/208; C12M23/00; C12M23/24; C12M29/06; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
Method for the bubble-free feed of gaseous reactants of a chemical and/or biological reaction into a liquid reaction medium, comprising filling pores of a porous polymer membrane with the reaction medium and then providing one side of the porous polymer membrane with the gaseous reactants, while immersing the other side of the porous polymer membrane into the liquid reaction medium, with pressure of the gaseous reactants lying below the bubble pressure determined with the reaction medium and being at least so great that the liquid reaction medium does not pass through the porous polymer membrane to the gas side.
Claim 2
Dependent Claim
99 words
Method for the bubble-free feed of gaseous reactants of a chemical and/or biological reaction into a liquid reaction medium, comprising filling pores of a porous polymer membrane with the reaction medium and then providing one side of the porous polymer membrane with the gaseous reactants, while immersing the other side of the porous polymer membrane into the liquid reaction medium, with pressure of the gaseous reactants lying below the bubble pressure determined with the reaction medium and being at least so great that the liquid reaction medium does not pass through the porous polymer membrane to the gas side.
Claim 3
Dependent Claim
19 words
Method according to claim 1, wherein said porous polymer membrane is used in the form of a flat membrane.
Claim 4
Dependent Claim
18 words
Method according to claim 1, wherein said porous polymer membrane is used in the form of a tube.
Claim 5
Dependent Claim
18 words
Method according to claim 1, wherein said porous polymer membrane is used in the form of hollow filaments.
Claim 6
Dependent Claim
21 words
Method according to claim 1, wherein relative pore volume of the porous polymer membrane amounts to between about 50 and 90%.
Claim 7
Dependent Claim
17 words
Method according to claim 1, wherein maximum pore diameter amounts to between about 0.2 and 3 μm.
Claim 8
Dependent Claim
22 words
Method according to claim 1, wherein said porous polymer membrane is composed of regenerated cellulose, cellulose ester, polyacrylonitrile, polyamide, polyester or polyolefin.
Claim 9
Dependent Claim
14 words
Method according to claim 1, wherein said porous polymer membrane is composed of polypropylene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |