US4400296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cation-selective liquid membranes and their use
Assignee: Novartis Corp
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Filing: 1981-06-18
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Granted: 1983-08-23
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Expires: 2001-06-18
Abstract
Abstract Use of succinosuccinic acid diesters of the formula <IMAGE> in which R is an alkyl, alkenyl or cycloalkyl having 4 to 24 C atoms, either dissolved in a water-immiscible organic solvent, or at elevated temperature in the form of their melts, as cation-selective liquid membranes.
Inventors
- 👤 Hans Batzer
- 👤 Joel Sinnreich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:04
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/38; Y; Y10; Y10S; Y10S204/00; Y10S204/13; Y10S423/00; Y10S423/07; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A liquid membrane for the separation of polyvalent cations from monovalent cations, from aqueous solutions, or for the selective separation of different polyvalent cations from aqueous solutions, which consists of an essentially water-immiscible organic solvent and of an essentially water-insoluble succinosuccinic acid diester, dissolved in the said solvent, of the formula I ##STR3## in which R is alkyl having 8 to 24 C atoms or alkenyl having 8 to 24 C atoms, the proportion of the succinosuccinic acid diester in the organic solvent being at least 0.01% by weight, based on the organic solvent, or of the melt of a compound of the formula I.
Claim 2
Dependent Claim
105 words
A liquid membrane for the separation of polyvalent cations from monovalent cations, from aqueous solutions, or for the selective separation of different polyvalent cations from aqueous solutions, which consists of an essentially water-immiscible organic solvent and of an essentially water-insoluble succinosuccinic acid diester, dissolved in the said solvent, of the formula I ##STR3## in which R is alkyl having 8 to 24 C atoms or alkenyl having 8 to 24 C atoms, the proportion of the succinosuccinic acid diester in the organic solvent being at least 0.01% by weight, based on the organic solvent, or of the melt of a compound of the formula I.
Claim 3
Dependent Claim
37 words
A liquid membrane according to claim 1, which consists of a succinosuccinic acid diester of the formula I in which R is alkyl or alkenyl having 8 to 18 C atoms, and of a water-immiscible organic solvent.
Claim 4
Dependent Claim
17 words
A liquid membrane according to claim 1, which consists of an aprotic non-polar solvent and dioleyl succinosuccinate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |