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US3775272A
Expired / Lapsed
US
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Mercury diaphragm chlor-alkali cell and process for decomposing alkali metal halides
Assignee: Olin Corp
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Filing: 1972-02-25
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Granted: 1973-11-27
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Expires: 1992-02-25
Abstract
Abstract An electrolytic cell for electrolysis of alkali metal halides having a diaphragm structure comprising cation permeable diaphragms enclosing an immobilized continuous phase of liquid alkali metal amalgam.
Inventors
- 👤 P Danna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:27
CPC Classifications
C; C25; C25B; C25B13/00; C25B1/00; C25B1/01; C25B1/34; C25B1/46
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
14 words
The cell as claimed in claim 1 in which said diaphragms are polymeric resins.
Claim 2
Dependent Claim
48 words
The cell as claimed in claim 2 in which said polymeric resin is selected from the group consisting of polyethylene, polytetrafluoroethylene, polypropylene, polyisobutylene, vulcanized natural and synthetic rubber, polystyrene sulfonic acid, polyfluoroalkylene sulfonic acid, polyvinyl chloride and copolymers of vinyl chloride and vinyl esters of lower fatty acids.
Claim 3
Dependent Claim
62 words
The cell as claimed in claim 3 in which said polymeric resin contains particles of an ion-exchange resin dispersed throughout said resin, said particles being of such size as to pass through a U.S. Standard sieve size No. 50 and being present in said diaphragm in an amount equal to 25 percent to 75 percent of the total weight of said diaphragm.
Claim 4
Dependent Claim
30 words
The cell as claimed in claim 1 in which said diaphragm structure has two spaced-apart cation permeable polymeric resin diaphragms enclosing said immobolized continuous phase of liquid alkali metal amalgam.
Claim 5
Dependent Claim
27 words
The cell as claimed in claim 1 in which said diaphragm structure is a microporous metal selected from the group consisting of iron, nickel, titanium and copper.
Claim 6
Dependent Claim
20 words
The cell as claimed in claim 6 in which said microporous metal has pore sizes between 50 and 200 microns.
Claim 7
Dependent Claim
19 words
The cell as claimed in claim 1 having in combination means for contacting said cathode with an oxygen-bearing gas.
Claim 8
Dependent Claim
89 words
In a process for electrolytic decompostion of an aqueous alkali metal halide selected from the group consisting of chloride and bromide to form alkali metal hydroxide, hydrogen and halogen gas, wherein an electric current is passed between an anode immersed in an anolyte of said halide and a cathode immersed in a catholyte of said hydroxide, said anolyte and said catholyte being separately maintained, the improvement of electrically connecting said anolyte and said catholyte through an immobolized continuous phase of liquid alkali metal amalgam enclosed between cation permeable diaphragms.
Claim 9
Dependent Claim
14 words
The process as claimed in claim 9 in which said alkali metal is sodium.
Claim 10
Dependent Claim
15 words
The process as claimed in claim 9 in which said alkali metal halide is chloride.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |