US3923628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm cell chlorine production
Assignee: Dow Chemical Co
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Filing: 1974-08-01
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Granted: 1975-12-02
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Expires: 1994-08-01
Abstract
Abstract Improved apparatus and process to electrolytically produce chlorine gas and an alkali metal hydroxide in a diaphragm cell. The improved process comprises circulating the catholyte and contacting a foraminous cathode with an oxidizing gas having a regulatably controlled moisture content.
Inventors
- 👤 Gerhard Gritzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:19
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/095; C25B9/00; C25B9/17; C25B9/19
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
AN ELECTROLYTIC CELL TO PRODUCE CHLORINE AND AN ALKALI METAL HYDROXIDE COMPRISING AN ANODE COMPARTMENT ADAPTED TO CONTAIN A CATHOLYTE TAINING AN ALKALI METAL CHLORIDE; A CATHODE COMPARTMENT ADAPTED TO CONTAIN A CATHOLYTE CONTAINING AN ALKALI METAL HYDROXIDE, SAID CATHODE COMPARTMENT BEING SPACED APART FROM SAID ANODE COMPARTMENT BY A DIAPHRAM; A DIAPHRAGM SUITED TO PASS AT LEAST ALKALI METAL IONS FROM SAID ANODE COMPARTMENT TO SAID CATHODE COMPARTMENT, SAID DIAPHRAGM ADAPTED TO SEPARATE SAID ANODE COMPARTMENT FROM SAID CATHODE COMPARTMENT; AN NODE POSITIONED IN SAID ANODE COMPARTMENT; A CATHODE POSITIONED IN SAID CATHODE COMPARTMENT AND SPACED APART FROM SAID DIAPHRAGM, SAID CATHODE HAVING A WALL PORTION ADAPTED TO BE IN CONTACT WITH THE CATHOLYTE AND ANOTHER WALL PORTION SUBSTANTIALLY SIMULTANEOUSLY ADAPTED TO BE IN CONTACT WITH AN OXIDIZING GAS; AN OXIDIZING GAS COMPARTMENT AT LEAST PARTIALLY DEFINED BY A SURFACE PORTION OF SAID CATHODE AND ADAPTED TO CONTAIN AN OXIDIZING GAS; A MEANS TO CIRCULATE THE CATHOLYTE AT LEAST WITHIN SAID CATHODE COMPARTMENT IN COMBINATION WITH SAID CATHODE COMPARTMENT;
Claim 2
Dependent Claim
170 words
AN ELECTROLYTIC CELL TO PRODUCE CHLORINE AND AN ALKALI METAL HYDROXIDE COMPRISING AN ANODE COMPARTMENT ADAPTED TO CONTAIN A CATHOLYTE TAINING AN ALKALI METAL CHLORIDE; A CATHODE COMPARTMENT ADAPTED TO CONTAIN A CATHOLYTE CONTAINING AN ALKALI METAL HYDROXIDE, SAID CATHODE COMPARTMENT BEING SPACED APART FROM SAID ANODE COMPARTMENT BY A DIAPHRAM; A DIAPHRAGM SUITED TO PASS AT LEAST ALKALI METAL IONS FROM SAID ANODE COMPARTMENT TO SAID CATHODE COMPARTMENT, SAID DIAPHRAGM ADAPTED TO SEPARATE SAID ANODE COMPARTMENT FROM SAID CATHODE COMPARTMENT; AN NODE POSITIONED IN SAID ANODE COMPARTMENT; A CATHODE POSITIONED IN SAID CATHODE COMPARTMENT AND SPACED APART FROM SAID DIAPHRAGM, SAID CATHODE HAVING A WALL PORTION ADAPTED TO BE IN CONTACT WITH THE CATHOLYTE AND ANOTHER WALL PORTION SUBSTANTIALLY SIMULTANEOUSLY ADAPTED TO BE IN CONTACT WITH AN OXIDIZING GAS; AN OXIDIZING GAS COMPARTMENT AT LEAST PARTIALLY DEFINED BY A SURFACE PORTION OF SAID CATHODE AND ADAPTED TO CONTAIN AN OXIDIZING GAS; A MEANS TO CIRCULATE THE CATHOLYTE AT LEAST WITHIN SAID CATHODE COMPARTMENT IN COMBINATION WITH SAID CATHODE COMPARTMENT;
Claim 3
Dependent Claim
67 words
THE ELECTROLYTIC CELL OF CLAIM 1 WHEREIN SAID CATHODE IS A FORMINOUS BODY HAVING AT LEAST THE SURFACE COMPOSED OF A SUBSTANTIALLY INERT MATERIAL SELECYED FROM THE GROUP CONSISTING OF RU, RH, PD, AG, OS, IR, PT AND AU WITH A COATING OF A MIXTURE OF PARTICULATE UNERT METAL AND AN ORGANIC COMPONENT SELECTED FROM THE GROUP CONSISTING OF POLYTETRAFLUORETHYLENE AND FLLUORINATED COPOLYMERS OF HEXAFLUOROPROPYLENE AND TETRAFLUOROPROPYLENE.
Claim 4
Dependent Claim
13 words
The electrolytic cell of claim 2 wherein the foraminous body is a screen.
Claim 5
Dependent Claim
56 words
The electrolytic cell of claim 1 wherein said cathode is a silver coated, woven copper screen with a mesh size of about 20 to about 50 with an overcoating of a mixture of platinum, silver or carbon particulate and an organic component selected from the group consisting of polytetrafluoroethylene, and fluorinated copolymers of hexafluoropropylene and tetrafluoroethylene.
Claim 6
Dependent Claim
11 words
The electrolytic cell of claim 2 wherein said diaphragm contains asbestos.
Claim 7
Dependent Claim
38 words
The electrolytic cell of claim 1 wherein said diaphragm contains asbestos. 7. The electrolytic cell of claim 1 wherein the catholyte circulation means is a pump spaced apart from said cathode compartment and communicating with said cathode compartment.
Claim 8
Dependent Claim
31 words
The electrolytic cell of claim 1 wherein said moisture control means is adapted to control the moisture within the range of from about 50 to about 100 per cent of saturation.
Claim 9
Dependent Claim
26 words
The electrolytic cell of claim 8 wherein the catholyte circulation means is a pump spaced apart from said cathode compartment and communicating with said cathode compartment.
References Cited (Backward Citations)
US2681887A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |