US4035268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the control of mercury cathode electrolysis cells
Assignee: Produits Chimiques Ugine Kuhlmann
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Filing: 1976-01-09
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Granted: 1977-07-12
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Expires: 1996-01-09
Abstract
Abstract Methods for control and protection of anode assemblies in mercury cathode cells for the electrolysis of alkali metal and alkaline earth metal chlorides so as to provide commands or an alarm when the load on an anode assembly exceeds a predetermined level so that the anode assembly or assemblies can be raised, the determination being made by comparing the difference between the load for each assembly and the mean of all assemblies with a predetermined upper level, and also desirably comparing the difference with a preselected lower level and determining the electrolysis voltage and comparing it with a desired lower electrolysis voltage to provide a command for lowering the anode assembly or assemblies involved, generally with a delay in the lowering command and with the raising of the anode assemblies taking precedence over the lowering thereof.
Inventors
- 👤 Andre Hote
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:49
CPC Classifications
C; C25; C25B; C25B15/00; C25B15/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
196 words
A method for the adjustment and protection of plural anode assemblies in mercury cathode alkali metal chloride and alkaline earth metal chloride electrolysis cells, which method consists of the essential steps of controlling the raising and lowering of the beams carrying the anodes by (a) comparing the difference i- i for each anode assembly, where i is the current in each given anode assembly carried by a beam and i is the mean of all anode assembly currents, with a preselected upper threshold current and issuing a command to raise each beam for which the difference exceeds the upper threshold, (b) comparing the difference with a preselected lower threshold current for each given anode assembly and giving a temporised command to lower each beam for which the difference is less than the lower limit and for which at the same time the electrolysis voltage is greater than the desired voltage, the raise command taking priority over the lower command, and (c) giving a raise command to all beams when the average electrolysis voltage, V r , becomes lower than a predetermined safe voltage, the raise command being continued until V r is above the safe voltage.
Claim 2
Independent Claim
196 words
A method for the adjustment and protection of plural anode assemblies in mercury cathode alkali metal chloride and alkaline earth metal chloride electrolysis cells, which method consists of the essential steps of controlling the raising and lowering of the beams carrying the anodes by (a) comparing the difference i- i for each anode assembly, where i is the current in each given anode assembly carried by a beam and i is the mean of all anode assembly currents, with a preselected upper threshold current and issuing a command to raise each beam for which the difference exceeds the upper threshold, (b) comparing the difference with a preselected lower threshold current for each given anode assembly and giving a temporised command to lower each beam for which the difference is less than the lower limit and for which at the same time the electrolysis voltage is greater than the desired voltage, the raise command taking priority over the lower command, and (c) giving a raise command to all beams when the average electrolysis voltage, V r , becomes lower than a predetermined safe voltage, the raise command being continued until V r is above the safe voltage.
Claim 3
Dependent Claim
49 words
A method according to claim 1 wherein the even distribution of electrolysis cell load between the several anode feed conductors supplying current to each anode assembly is continuously controlled and the resulting signals are processed continuously to correct the difference in a time interval within the selected electrolysis voltages.
Claim 4
Dependent Claim
23 words
A method according to claim 1 wherein the measurements and handling thereof are carried out by an electronic system coupled to a computer.
References Cited (Backward Citations)
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Cited
US3817846A
Cited
FR2013358A1
Cited
US3723285A
Cited
US3926750A
Cited
US3900373A
Cited
US3983025A
Cited
US3844913A
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US3853723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |