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US3941667A
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Method for the reprocessing of cell liquor from diaphragm cell electrolysis plants
Assignee: ThyssenKrupp Industrial Solutions AG
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Filing: 1975-03-21
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Granted: 1976-03-02
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Expires: 1995-03-21
Abstract
Abstract A method for the reprocessing of cell liquor from diaphragm cell electrolysis plants that operate on potassium chloride brine. The cell liquor is contacted with an SO 2 -bearing gas, and the effluent solution is oxidized with an oxygen-bearing gas, then a definite quantity of KCl is added to said oxidized solution, and this solution is subjected to a filtration and precipitation step, and finally it is then recycled as make-up brine to the electrolysis cell plant.
Inventors
- 👤 Georg Von Semel
- 👤 Eduard Schibilla
- 👤 Wolfgang Strewe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:45
CPC Classifications
C; C25; C25B; C25B15/00; C25B15/08; C25B15/087
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
86 words
Method for reprocessing cell liquor from a diaphragm cell electrolysis plant having potassium chloride brine cycle comprising 1. removing an effluent cell liquor solution from the diaphragm cell electrolysis plant, 2. contacting the solution with an SO 2 -bearing gas, 3. oxidizing the solution with an oxygen-bearing gas, 4. adding a predetermined quantity of KCl to the oxidized solution, 5. subjecting the solution to a filtration and precipitation step, and 6. recycling the solution as a make-up brine to the diaphragm cell of the electrolysis plant.
Claim 2
Dependent Claim
86 words
Method for reprocessing cell liquor from a diaphragm cell electrolysis plant having potassium chloride brine cycle comprising 1. removing an effluent cell liquor solution from the diaphragm cell electrolysis plant, 2. contacting the solution with an SO 2 -bearing gas, 3. oxidizing the solution with an oxygen-bearing gas, 4. adding a predetermined quantity of KCl to the oxidized solution, 5. subjecting the solution to a filtration and precipitation step, and 6. recycling the solution as a make-up brine to the diaphragm cell of the electrolysis plant.
Claim 3
Dependent Claim
24 words
The method of claim 1, in which the make-up brine fed to the diaphragm cell has a KCl content of 250 to 300 grams/liter.
Claim 4
Dependent Claim
49 words
The method of claim 1 wherein the solution produced is a K 2 SO 3 solution, comprising oxidizing the K 2 SO 3 solution to K 2 SO 4 with an oxygen-bearing gas at a temperature of 50° to 100°C., and under a pressure of 3 to 24 atmospheres.
References Cited (Backward Citations)
US3533748A
Cited
US3873672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |