US3864236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the electrolytic production of alkali
Assignee: Occidental Chemical Corp
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Filing: 1972-09-29
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Granted: 1975-02-04
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Expires: 1992-09-29
Abstract
Abstract A method, and apparatus for use therein, whereby an alkali, such as an alkali metal hydroxide, is produced at the cathode by the electrolysis of aqueous alkali metal halide solutions and the process is operated to produce either chlorine or HCl at the anode.
Inventors
- 👤 Olle Lindstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:05
CPC Classifications
C; C25; C25B; C25B9/00; C25B9/70; C25B1/00; C25B1/01; C25B1/14; C25B1/16; C25B11/00; C25B11/04; C25B11/051; C25B9/73; C25B9/77; Y; Y10; Y10S; Y10S204/00; Y10S204/03
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
130 words
AN ELECTROLYTIC APPARATUS WHICH COMPRISES A CELL, SAID CELL HAVING DISPOSED THEREIN A CATHODE AND AN ANODE, SAID CATHODE AND ANODE BEING SEPARATED BY A FLUID PERMEABLE DIAPHRAGM TO FORM AN ANODE COMPARTMENT CONTAINING SAID ANODE AND A CATHODE COMPARTMENT CONTAINING SAID CATHODE, SAID APPARATUS HAVING MEANS FOR PASSING HYDROGEN GAS THROUGH SAID ANODE INTO SAID ANODE COMPARTMENT, SAID ANODE INCLUDING A CATALYST FOR THE ELECTROCHEMICAL OXIDATION OF HYDROGEN GAS TO HYDROGEN IONS, SAID ANODE BEING FORMED IN TWO LAYERS, SAID FIRST LAYER BEING A POROUS SINTERED COARSE LAYER OF PLATINIZED TITANIUM AND SAID SECOND LAYER BEING A POROUS SINTERED FINER LAYER OF TITANIUM, SAID ANODE BEING POSITIONED SO THAT THE HYDROGEN GAS IS PASSED INITIALLY THROUGH SAID FIRST LAYER AND THEN THROUGH SAID SECOND LAYER INTO THE ANODE COMPARTMENT.
Claim 2
Dependent Claim
130 words
AN ELECTROLYTIC APPARATUS WHICH COMPRISES A CELL, SAID CELL HAVING DISPOSED THEREIN A CATHODE AND AN ANODE, SAID CATHODE AND ANODE BEING SEPARATED BY A FLUID PERMEABLE DIAPHRAGM TO FORM AN ANODE COMPARTMENT CONTAINING SAID ANODE AND A CATHODE COMPARTMENT CONTAINING SAID CATHODE, SAID APPARATUS HAVING MEANS FOR PASSING HYDROGEN GAS THROUGH SAID ANODE INTO SAID ANODE COMPARTMENT, SAID ANODE INCLUDING A CATALYST FOR THE ELECTROCHEMICAL OXIDATION OF HYDROGEN GAS TO HYDROGEN IONS, SAID ANODE BEING FORMED IN TWO LAYERS, SAID FIRST LAYER BEING A POROUS SINTERED COARSE LAYER OF PLATINIZED TITANIUM AND SAID SECOND LAYER BEING A POROUS SINTERED FINER LAYER OF TITANIUM, SAID ANODE BEING POSITIONED SO THAT THE HYDROGEN GAS IS PASSED INITIALLY THROUGH SAID FIRST LAYER AND THEN THROUGH SAID SECOND LAYER INTO THE ANODE COMPARTMENT.
Claim 3
Dependent Claim
21 words
The apparatus as claimed in claim 1 wherein the fluid permeable diaphragm is formed of a cation permeable ion exchange membrane.
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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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |