US4297182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of alkali metal hydroxide
Assignee: AGC Inc
•
Filing: 1980-04-18
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Granted: 1981-10-27
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Expires: 2000-04-18
Abstract
Abstract A gas and liquid permeable cathode is bonded on an ion-exchange membrane and the composite electrode is used in an electrolytic cell for a production of sodium hydroxide by an electrolysis of an aqueous solution of sodium chloride. The cathode comprises a thermally decomposed nickel obtained from a nickel salt of fatty acid, Raney nickel, stabilized Raney nickel or carbonyl nickel and a polytetrafluoroethylene.
Inventors
- 👤 Yoshio Oda
- 👤 Takeshi Morimoto
- 👤 Kohji Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:22
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/095; C25B9/00; C25B9/17; C25B9/19; C25B9/23
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
In a process for producing an alkali metal hydroxide by electrolyzing an aqueous solution of an alkali metal chloride by using a gas and liquid-permeable cathode bonded on an ion-exchange membrane, the improvement wherein said gas and liquid permeable cathode consists essentially of a nickel containing powder selected from the group consisting of a thermally decomposed nickel obtained from a nickel salt of fatty acid; Raney nickel; stabilized Raney nickel; and carbonyl nickel and a polytetrafluoroethylene.
Claim 2
Dependent Claim
76 words
In a process for producing an alkali metal hydroxide by electrolyzing an aqueous solution of an alkali metal chloride by using a gas and liquid-permeable cathode bonded on an ion-exchange membrane, the improvement wherein said gas and liquid permeable cathode consists essentially of a nickel containing powder selected from the group consisting of a thermally decomposed nickel obtained from a nickel salt of fatty acid; Raney nickel; stabilized Raney nickel; and carbonyl nickel and a polytetrafluoroethylene.
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein said nickel salt of fatty acid is nickel formate, nickel acetate, nickel oxalate, nickel stearate or nickel citrate.
Claim 4
Dependent Claim
27 words
A process according to claim 1 wherein the ratio of said nickel containing powder to said polytetrafluoroethylene is in the range of 10:0.05 to 5 by weight.
Claim 5
Dependent Claim
27 words
A process according to claim 1 wherein said gas-liquid permeable cathode has an average pore size of 0.01 to 1000μ and a porosity of 20 to 95%.
Claim 6
Dependent Claim
16 words
A process according to claim 1 wherein said ion-exchange membrane is a fluorinated cation exchange membrane.
Claim 7
Dependent Claim
58 words
A process according to claim 1 wherein the ratio of said nickel containing powder to said polytetrafluoroethylene is in the range of 10:0.05 to 5 by weight, wherein said gas-liquid permeable cathode has an average pore size of 0.01 to 1000μ and a porosity of 20 to 95%, and wherein said ion-exchange membrane a fluorinated cation exchange membrane.
Claim 8
Dependent Claim
30 words
A process according to claim 6 wherein said nickel containing powder and said polytetrafluoroethylene are combined by admixing the powder with an aqueous dispersion of polytetrafluoroethylene and thereafter removing water.
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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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |