US4046653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel electrolysis method and apparatus
Assignee: De Nora SpA
•
Filing: 1975-05-27
•
Granted: 1977-09-06
•
Expires: 1995-05-27
Abstract
Abstract A novel process for the preparation of an alkali metal halate by electrolysis of an aqueous alkali metal halide solution comprising passing an alkali metal halide solution upwardly through a plurality of bipolar electrolysis units while passing an electrolysis current therethrough at a temperature of 90° to 110° C and at a current density to volume ratio of 15 to 30 A/liter to convert at least a portion of the alkali metal halide to alkali metal hypohalite, passing the resulting electrolyte while venting the hydrogen formed to a reaction zone whose volume is sufficient to provide a residence time to substantially complete the conversion of the alkali metal hypohalite to alkali metal halate and recovering the said halate from the electrolyte and an apparatus for performing the said process.
Inventors
- 👤 Oronzio De Nora
- 👤 Vittorio De Nora
- 👤 Placido M. Spaziante
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:48
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/02; C25B11/036; C25B1/00; C25B1/01; C25B1/24; C25B1/26; C25B1/265; C25B9/00; C25B9/60; C25B9/65; C25B9/70; C25B9/73; C25B9/75
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
186 words
A process for the preparation of an alkali metal halate by electrolysis of an aqueous alkali metal halide solution comprising passing an alkali metal halide solution utilizing a sustained gas-lift effect of evolved hydrogen gas, upwardly through a vertically enlongated housing, a plurality of vertically stacked bipolar electrolysis units occupying substantially the entire cross-sectional area of the housing with vertical anodes and cathodes interleaved to provide a vertical honeycomb effect and to avoid recirculation of the electrolyte inside the compartment while passing an electrolysis current therethrough at a temperature of 90° to 100° C. and at a electrolysis current to volume ratio of 15 to 30 A/liter to convert at least a portion of the alkali metal halide to alkali metal hypohalite and to alkali metal halate, providing for very low hydraulic pressure drop along the entire vertical path of the electrolyte, passing the resulting electrolyte, while venting the hydrogen formed, to a reaction zone whose volume is sufficient to provide a residence time to substantially complete the conversion of the alkali metal hypohalite to alkali metal halate and recovering the said halate from the electrolyte.
Claim 2
Dependent Claim
186 words
A process for the preparation of an alkali metal halate by electrolysis of an aqueous alkali metal halide solution comprising passing an alkali metal halide solution utilizing a sustained gas-lift effect of evolved hydrogen gas, upwardly through a vertically enlongated housing, a plurality of vertically stacked bipolar electrolysis units occupying substantially the entire cross-sectional area of the housing with vertical anodes and cathodes interleaved to provide a vertical honeycomb effect and to avoid recirculation of the electrolyte inside the compartment while passing an electrolysis current therethrough at a temperature of 90° to 100° C. and at a electrolysis current to volume ratio of 15 to 30 A/liter to convert at least a portion of the alkali metal halide to alkali metal hypohalite and to alkali metal halate, providing for very low hydraulic pressure drop along the entire vertical path of the electrolyte, passing the resulting electrolyte, while venting the hydrogen formed, to a reaction zone whose volume is sufficient to provide a residence time to substantially complete the conversion of the alkali metal hypohalite to alkali metal halate and recovering the said halate from the electrolyte.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the alkali metal halide is sodium chloride.
Claim 4
Dependent Claim
26 words
The method of claim 2 wherein the current density is 2000 to 6000 A/m 2 and the electrolyte speed is 35 to 55 cm per second.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the alkali metal halide is potassium chloride.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the average electrolyte speed through the electrolysis cell is 30 to 60 cm per second.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the volume ratio of the electrolysis cell to the reaction chamber is less than 0.5.
Claim 8
Dependent Claim
14 words
The method of claim 6 wherein the said ratio is between 0.1 and 0.35.
References Cited (Backward Citations)
US3385779A
Cited
US3640804A
Cited
US3539486A
Cited
US3493478A
Cited
US3616443A
Cited
US3684670A
Cited
US3489667A
Cited
US3766044A
Cited
US3849281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |