US4169024A
Expired / Lapsed
US
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Process for electrolytically producing chlorine in a cell having a diaphragm comprising hydrophilic fluoropolymers
Assignee: EIDP Inc
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Filing: 1978-04-11
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Granted: 1979-09-25
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Expires: 1998-04-11
Abstract
Abstract Certain fluoropolymers, when chemically modified by reacting them with sulfur or phosphorus containing compounds, become hydrophilic materials useful for making ion-exchange membranes, especially diaphragms for electrolytic cells, particularly chlor-alkali cells used in the production of chlorine, hydrogen and sodium hydroxide from brine.
Inventors
- 👤 James C. Fang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:28
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C08J5/2293; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2237; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C25B13/00; C25B13/04; C25B13/05; C25B13/07; C25B13/08; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
In a process for the electrolytic production of chlorine from brine, the improvement comrpising keeping the chlorine produced at the anode separated from the hydrogen and sodium hydroxide produced at the cathode with a diaphragm comprising a fluoropolymer provided as a hydrophilic fluoropolymer containing nonterminal units represented by the structure ##STR28## where R is an alkyl radical of 1-12 carbon atoms or a cycloalkyl radical of 3-12 carbon atoms, the hydrophilic fluoropolymer having a phosphorus content of about 0.1-10% by weight, not more than about 1% by weight of the fluoropolymer dissolving in water at 20° C.
Claim 2
Dependent Claim
97 words
In a process for the electrolytic production of chlorine from brine, the improvement comrpising keeping the chlorine produced at the anode separated from the hydrogen and sodium hydroxide produced at the cathode with a diaphragm comprising a fluoropolymer provided as a hydrophilic fluoropolymer containing nonterminal units represented by the structure ##STR28## where R is an alkyl radical of 1-12 carbon atoms or a cycloalkyl radical of 3-12 carbon atoms, the hydrophilic fluoropolymer having a phosphorus content of about 0.1-10% by weight, not more than about 1% by weight of the fluoropolymer dissolving in water at 20° C.
References Cited (Backward Citations)
US3960697A
Cited
US4014775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |