US4389289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bipolar electrolyzer
Assignee: De Nora SpA
•
Filing: 1981-01-14
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Granted: 1983-06-21
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Expires: 2001-01-14
Abstract
Abstract A bipolar diaphragm electrolyzer particularly suitable for electrolysis of alkali metal halide aqueous solutions wherein the bipolar wall separating the electrode compartments is formed of at least two sheets made of different metals, suitable pressure being applied against the metal sheets to provide for electrical continuity across the bipolar wall, said pressure being exerted either by means of resilient elements which are compressed when the electrolyzer is closed or by maintaining the electrode compartments under a sufficient hydrostatic pressure during the electrolytic process.
Inventors
- 👤 Oronzio DeNora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:17
CPC Classifications
C; C25; C25B; C25B9/00; C25B9/70; C25B9/73; C25B9/77; C25B9/60; C25B9/65; C25B9/75
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
95 words
A bipolar electrolysis cell of the diaphragm type comprising a frame made of an electrically inert material provided with means to introduce and remove anolyte and catholyte, and anodic endplate, a cathodic endplate and at least one polar element comprised of abutting cathodic plate and anodic plate having secured thereto the cathode structure and the anode structure respectively, the said plates of the bipolar element being held in electrical contact with each other by means of pressure applied by a resilient mat coextensive with the cell area which is compressed upon assembly of the electrolyzer.
Claim 2
Dependent Claim
95 words
A bipolar electrolysis cell of the diaphragm type comprising a frame made of an electrically inert material provided with means to introduce and remove anolyte and catholyte, and anodic endplate, a cathodic endplate and at least one polar element comprised of abutting cathodic plate and anodic plate having secured thereto the cathode structure and the anode structure respectively, the said plates of the bipolar element being held in electrical contact with each other by means of pressure applied by a resilient mat coextensive with the cell area which is compressed upon assembly of the electrolyzer.
Claim 3
Dependent Claim
17 words
The electrolyzer of claim 1 wherein the resilient mat is placed between the diaphragm and the cathode.
Claim 4
Dependent Claim
25 words
The electrolyzer of claim 1 wherein the resilient mat is placed between the abutting surfaces of two plates of different metals forming the bipolar wall.
Claim 5
Dependent Claim
18 words
The electrolyzer of claim 1 wherein the amount of pressure is between 100 and 2000 g/cm 2 .
Claim 6
Dependent Claim
39 words
The electrolyzer of claim 1 wherein at least one of the abutting surfaces of the plates forming the bipolar walls is coated with a layer of metal selected from the group consisting of copper, tin, nickel, silver and platinum.
Claim 7
Dependent Claim
17 words
The electrolyzer of claim 1 wherein the resilient mats are made of a fabric of metal wire.
Claim 8
Dependent Claim
34 words
A method of electrolyzing an aqueous alkali metal halide solution comprising feeding an aqueous alkali metal halide solution to an electrolyzer of claim 1 while impressing an electrolysis current thereon and recovering the halogen.
Claim 9
Dependent Claim
14 words
The method of claim 7 wherein the halide is chloride and chlorine is recovered.
Claim 10
Dependent Claim
47 words
A bipolar element for an electrolysis cell comprising a cathodic plate having secured thereto a cathode structure and an anodic plate having secured thereto an anode structure and a resilient mat between surfaces of the anodic plate and cathodic plate abutting opposite sides of the resilient member.
Claim 11
Dependent Claim
47 words
A bipolar element for an electrolysis cell comprising a cathodic plate having secured thereto a cathode structure and an anodic plate having secured thereto an anode structure and a resilient mat between surfaces of the anodic plate and cathodic plate abutting opposite sides of the resilient member.
Claim 12
Dependent Claim
16 words
The bipolar element of claim 9 wherein the resilient mat is a fabric of metal wire.
Claim 13
Dependent Claim
19 words
The bipolar element of claim 9 wherein the uncompressed thickness of the resilient mat is 2 to 10 mm.
Claim 14
Dependent Claim
15 words
The bipolar element of claim 11 wherein the uncompressed thickness is 2 to 5 mm.
Claim 15
Dependent Claim
96 words
A bipolar electrolysis cell of the diaphragm type comprising a frame made of an electrically inert material provided with means to introduce and remove anolyte and catholyte in an anodic compartment and a cathodic compartment respectively, an anodic endplate, a cathodic endplate and at least one bipolar element comprised of abutting cathodic plate and anodic plate having secured thereto the cathode structure and the anode structure respectively, the said plates of the bipolar element being held in electrical contact with each other by means of pressure obtained by pressurizing both the anodic and the cathodic compartments.
Claim 16
Dependent Claim
96 words
A bipolar electrolysis cell of the diaphragm type comprising a frame made of an electrically inert material provided with means to introduce and remove anolyte and catholyte in an anodic compartment and a cathodic compartment respectively, an anodic endplate, a cathodic endplate and at least one bipolar element comprised of abutting cathodic plate and anodic plate having secured thereto the cathode structure and the anode structure respectively, the said plates of the bipolar element being held in electrical contact with each other by means of pressure obtained by pressurizing both the anodic and the cathodic compartments.
Claim 17
Dependent Claim
21 words
The electrolyzer of claim 13 wherein one of the plates forming the bipolar element is more flexible than the other plate.
References Cited (Backward Citations)
US3873437A
Cited
US3948750A
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JPS5248596A
Cited
US4108752A
Cited
JPS54151595A
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US4247376A
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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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |