US3923630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic cell including diaphragm and diaphragm-support structure
Assignee: BASF Corp
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Filing: 1974-08-16
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Granted: 1975-12-02
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Expires: 1994-08-16
Abstract
Abstract In a conventional diaphragm electrolytic cell for the production of chlorine and caustic from aqueous alkali metal chloride solutions, the asbestos diaphragm is replaced by a continuous sheet or an endless band of porous polymeric diaphragm material attached to its own support members. Typically, the new diaphragm assembly of this invention is made up of three components, an upper diaphragm support frame, the continuous sheet of porous polymeric diaphragm material and the lower diaphragm support frame. The diaphragm can be made from polymeric material with a fluorocarbon polymer being illustrative of a suitable material.
Inventors
- 👤 Shyam D Argade
- 👤 Stephen M Collins
- 👤 James B Armitage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:20
CPC Classifications
C; C25; C25B; C25B9/00; C25B9/17; C25B9/19; C25B13/00; C25B13/02; C25B9/21
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
161 words
AIN A DIAPHRAGM CELL FOR THE PRODUCTION OF CHLORINE AND CAUSTIC FROM AQUEOUS ALAKLIE METAL CHLORIDE SOLUTIONS HAVING A PLURALITY OF ANODES MOUNTED AT THE BOTTOM OF SAID CELL, CATHODES BETWEEN ADJACENT ANODES AND SPACED BETWEEN EACH CATHODE AND ANODE A DIAPHRAGM WHICH DIVIDES THE CELL INTO ANOLYTE AND CATHOLYTE COMPARTMENTS THE IMPROVEMENT WHICH COMPRISES: A DIAPHRAM ASSEMBLY COMPOSED OF AN UPPER DIAPHRAGM SUPPORT, A LOWER DIAPHRAGM SUPPORT AND AN ENDLESS BAND DIAPHRAGM EXTENDING FROM SAID UPPER SUPPORT TO SAID LOWER SUPPORT, BOTH SAID DIAPHRAGM SUPPORTS BEING MADE OF AN ELECTRIALLY NON-CONDUCTIVE POLYMERIC COMPOSITION, SAID LOWER SUPPORT RESTING ON OR ADJACENT TO THE BOTTOM OF SAID CELL AND HAVING OPENINGS THEREIN WHICH ALLOW SAID ANODES TO EXTEND THROUGH SAID LOWER SUPPORT, SAID DIAPHRAGM BEING IN CONNECTION WITH SAID UPPER AND LOWER SUPPORTS THEREBY DEFINING A CONTINUOUS BARRIER SEPARATING SAID ANODES FROM SAID CATHODES SO THAT ALL OF THE FLOW OF ELECTROLYTE FROM THE ANODE TO THE CATHODE IS THROUGH IS DIAPHRAGM.
Claim 2
Dependent Claim
161 words
AIN A DIAPHRAGM CELL FOR THE PRODUCTION OF CHLORINE AND CAUSTIC FROM AQUEOUS ALAKLIE METAL CHLORIDE SOLUTIONS HAVING A PLURALITY OF ANODES MOUNTED AT THE BOTTOM OF SAID CELL, CATHODES BETWEEN ADJACENT ANODES AND SPACED BETWEEN EACH CATHODE AND ANODE A DIAPHRAGM WHICH DIVIDES THE CELL INTO ANOLYTE AND CATHOLYTE COMPARTMENTS THE IMPROVEMENT WHICH COMPRISES: A DIAPHRAM ASSEMBLY COMPOSED OF AN UPPER DIAPHRAGM SUPPORT, A LOWER DIAPHRAGM SUPPORT AND AN ENDLESS BAND DIAPHRAGM EXTENDING FROM SAID UPPER SUPPORT TO SAID LOWER SUPPORT, BOTH SAID DIAPHRAGM SUPPORTS BEING MADE OF AN ELECTRIALLY NON-CONDUCTIVE POLYMERIC COMPOSITION, SAID LOWER SUPPORT RESTING ON OR ADJACENT TO THE BOTTOM OF SAID CELL AND HAVING OPENINGS THEREIN WHICH ALLOW SAID ANODES TO EXTEND THROUGH SAID LOWER SUPPORT, SAID DIAPHRAGM BEING IN CONNECTION WITH SAID UPPER AND LOWER SUPPORTS THEREBY DEFINING A CONTINUOUS BARRIER SEPARATING SAID ANODES FROM SAID CATHODES SO THAT ALL OF THE FLOW OF ELECTROLYTE FROM THE ANODE TO THE CATHODE IS THROUGH IS DIAPHRAGM.
Claim 3
Dependent Claim
43 words
The electrolytic cell of claim 1 wherein the openings of the upper diaphragm support and the lower diaphragm support are in axial alignment with each other and the cathode is encased within the upper diaphragm support, the diaphragm and the lower diaphragm support.
Claim 4
Dependent Claim
43 words
The electrolytic cell of claim 1 wherein the upper diaphragm support and the lower diaphragm support openings are non-axially aligned so that the system of diaphragm supports and diaphragm form a complete barrier between said anodes and said cathodes without encasing said cathodes.
Claim 5
Dependent Claim
20 words
The electrolytic cell of claim 1 wherein the diaphragm support and the diaphragm are made from polytetrafluoroethylene polymers or copolymers.
Claim 6
Dependent Claim
14 words
The electrolytic cell of claim 1 wherein the diaphragm is a porous sheet material.
Claim 7
Dependent Claim
19 words
The electrolytic cell of claim 1 wherein the diaphragm is heat-sealed to the upper and lower diaphragm support members.
Claim 8
Dependent Claim
27 words
The electrolytic cell of claim 1 wherein the diaphragm is heat-sealed to the lower diaphragm support member and is mechanically sealed to the upper diaphragm support member.
Claim 9
Dependent Claim
20 words
The electrolytic cell of claim 1 wherein separating screens are interposed between the diaphragm and the anode and the cathode.
References Cited (Backward Citations)
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 |