US4120772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cell for electrolyzing aqueous solutions using a porous anode separator
Assignee: Olin Corp
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Filing: 1977-04-26
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Granted: 1978-10-17
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Expires: 1997-04-26
Abstract
Abstract Electrolysis of alkali metal chloride solutions to produce chlorine and alkali metal hydroxides is accomplished in a cell comprising an anode compartment, a cathode compartment and an anode separator which divides the anode compartment from the cathode compartment. The anode separator is comprised of a porous plate of a valve metal having an electrochemically active coating on the face, and an electrochemically non-active coating on the back and a portion of the interior. The electrochemically non-active barrier layer may include resinous materials, for example, polyarylene compounds or polyolefin compounds. The anode separator provides improved gas separation properties, eliminates the need for a separate diaphragm or membrane and enables the cell to operate with reduced power requirements.
Inventors
- 👤 Igor V. Kadija
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:40
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
150 words
A cell for electrolyzing alkali metal chloride solutions comprised of an anode compartment, a cathode compartment, an anode separator dividing the anode compartment from the cathode compartment, a cathode in the cathode compartment, where the anode separator comprises a porous plate of a valve metal selected from the group consisting of titanium, tantalum, and niobium, said porous plate having a face, a back and an interior structure, said face having an electrochemically active coating selected from the group consisting of a platinum group metal, a platinum group metal oxide and mixtures thereof, said back and a portion of said interior having an electrochemically non-active barrier layer comprising a mixture of an oxide of titanium, tantalum, or niobium and a ceramic oxide selected from the group consisting of silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, and mixtures thereof, wherein said portion is at least 10 percent of said interior structure.
Claim 2
Dependent Claim
150 words
A cell for electrolyzing alkali metal chloride solutions comprised of an anode compartment, a cathode compartment, an anode separator dividing the anode compartment from the cathode compartment, a cathode in the cathode compartment, where the anode separator comprises a porous plate of a valve metal selected from the group consisting of titanium, tantalum, and niobium, said porous plate having a face, a back and an interior structure, said face having an electrochemically active coating selected from the group consisting of a platinum group metal, a platinum group metal oxide and mixtures thereof, said back and a portion of said interior having an electrochemically non-active barrier layer comprising a mixture of an oxide of titanium, tantalum, or niobium and a ceramic oxide selected from the group consisting of silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, and mixtures thereof, wherein said portion is at least 10 percent of said interior structure.
Claim 3
Dependent Claim
12 words
The cell of claim 1 wherein said ceramic oxide is silicon oxide.
Claim 4
Dependent Claim
28 words
The cell of claim 1 wherein said valve metal is titanium and said porous plate has a thickness of from about 1/24th to about 3/8 of an inch.
Claim 5
Dependent Claim
21 words
The cell of claim 3 wherein said porous plate has a porosity of from about 30 percent to about 75 percent.
Claim 6
Dependent Claim
22 words
The cell of claim 4 wherein said porous plate has a pore size of from about 5 microns to about 500 microns.
Claim 7
Dependent Claim
22 words
The cell of claim 4 wherein said valve metal oxide is selected from the group consisting of titanium oxide and tantalum oxide.
Claim 8
Dependent Claim
12 words
The cell of claim 6 wherein said ceramic oxide is silicon oxide.
Claim 9
Dependent Claim
18 words
The cell of claim 6 wherein said ceramic oxide is a mixture of silicon oxide and aluminum oxide.
Claim 10
Dependent Claim
35 words
The cell of claim 7 wherein said electrochemically active coating is a platinum group metal oxide selected from the group consisting of platinum oxide, palladium oxide, iridium oxide, ruthenium oxide, rhodium oxide and osmium oxide.
Claim 11
Dependent Claim
13 words
The cell of claim 9 wherein said electrochemically active coating is ruthenium oxide.
Claim 12
Dependent Claim
13 words
The cell of claim 10 wherein said valve metal oxide is titanium oxide.
Claim 13
Dependent Claim
24 words
The cell of claim 1 wherein said portion of said interior structure having said barrier layer is from about 10 to about 90 percent.
Claim 14
Dependent Claim
22 words
The cell of claim 10 wherein said porous plate has a foraminous structure of a valve metal enveloped by said porous plate.
Claim 15
Dependent Claim
13 words
The cell of claim 13 wherein said foraminous structure is an expanded mesh.
Claim 16
Dependent Claim
11 words
The cell of claim 14 wherein said valve metal is titanium.
Claim 17
Dependent Claim
119 words
In an anode separator including in combination a porous plate of a valve metal, said porous plate having a face, a back and an interior structure, said face having en electrochemically active coating selected from the group consisting of a platinum group metal, a platinum group metal oxide and mixtures thereof, said back and a portion of said interior having a barrier layer mixture of a valve metal oxide and a ceramic oxide selected from the group consisting of silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, and mixtures thereof, wherein said portion is at least 10 percent of said interior structure, the improvement which comprises including in the barrier layer a density increasing proportion of a resinous material.
Claim 18
Dependent Claim
119 words
In an anode separator including in combination a porous plate of a valve metal, said porous plate having a face, a back and an interior structure, said face having en electrochemically active coating selected from the group consisting of a platinum group metal, a platinum group metal oxide and mixtures thereof, said back and a portion of said interior having a barrier layer mixture of a valve metal oxide and a ceramic oxide selected from the group consisting of silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, and mixtures thereof, wherein said portion is at least 10 percent of said interior structure, the improvement which comprises including in the barrier layer a density increasing proportion of a resinous material.
Claim 19
Dependent Claim
28 words
The anode separator of claim 16 wherein said resinous material comprises from about 5 to about 50 percent by volume of the total mixture comprising the barrier layer.
Claim 20
Dependent Claim
15 words
The anode separator of claim 17 wherein said resinous material is a polyarylene sulfide compound.
Claim 21
Dependent Claim
14 words
The anode separator of claim 18 wherein said polyarylene sulfide compound is polyphenylene sulfide.
Claim 22
Dependent Claim
42 words
The anode separator of claim 17 wherein said resinous material is a polymer of a compound selected from the group consisting of olefins, chlorosubstituted olefins and fluorosubstituted olefins, said olefins having from 2 to about 6 carbon atoms in the primary chain.
Claim 23
Dependent Claim
26 words
The anode separator of claim 20 wherein said compound is selected from the group consisting of ethylene, tetrafluoroethylene, vinyl chloride, chlorotrifluoroethylene, polyvinyl fluoride and polyvinylidene fluoride.
Claim 24
Dependent Claim
17 words
The anode separator of claim 20 wherein said resinous material is a copolymer of ethylene and monochlorofluorethane.
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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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |