US3763005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic process for obtaining chlorine in a pure state and alkali metal phosphates in concentrated solution and a cell for accomplishing this process
Assignee: Progil SARL
•
Filing: 1971-05-12
•
Granted: 1973-10-02
•
Expires: 1991-05-12
Abstract
Abstract A process and apparatus for the manufacture of pure chlorine, hydrogen and alkali metal phosphates in concentrated solution by introducing an aqueous alkali metal chloride solution into the anodic compartment of a cell and concentrated phosphoric acid or alkali metal phosphate aqueous solution into the cathodic compartment. The cell has a cationic permselective membrane placed between a porous anode of the titanium group having a platinum metal group coating on the surface opposite the membrane and the cathode.
Inventors
- 👤 J Butre
- 👤 F Pierrot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:03
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/14; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/30; C01B25/301; C01B25/303; C25B1/24; C25B1/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
24 words
A process according to claim 1 in which said phosphoric acid is the crude acid coming from natural phosphate attack by the wet process.
Claim 2
Dependent Claim
36 words
A process according to claim 1 in which an alkali metal phosphate in concentrated solution is introduced into the cathodic compartment, whereby as a result of the process the alkali metal to phosphorus ratio is enhanced.
Claim 3
Dependent Claim
26 words
A process according to claim 1 in which a mixture of chlorine and a solution of alkali metal chlorides, is continuously removed from said anodic compartment.
Claim 4
Dependent Claim
25 words
A process according to claim 1 in which a mixture of hydrogen and of phosphates in concentrated state is continuously removed from said cathodic compartment.
Claim 5
Dependent Claim
26 words
A process according to claim 1 in which said cationic permselective membrane is made of a polymer presenting a good resistance to chlorine and alkaline agents.
Claim 6
Dependent Claim
41 words
A process according to claim 1 in which said anode comprises a metal of the titanium group, coated only on one face with an active coating of a noble metal of the platinum group or of an oxide or alloy thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |