US4518470A
Expired / Lapsed
US
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Ion exchange membrane cell and electrolytic process using thereof
Assignee: AGC Inc
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Filing: 1984-05-02
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Granted: 1985-05-21
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Expires: 2004-05-02
Abstract
Abstract An electrolytic cell comprises an anode and a cathode which are partitioned by an ion exchange membrane having at least one roughened surface which contacts with or closes in a distance of up to 20 mm to a corresponding electrode.
Inventors
- 👤 Yoshio Oda
- 👤 Takeshi Morimoto
- 👤 Toshiya Matsubara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:43
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2275; C08J5/2281; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C25B13/00; C25B13/02; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
86 words
An electrolytic cell, which comprises: an anode and a cathode which are partitioned by an ion exchange membrane having at least one surface roughened, said surface roughening being defined by a fine concavo-convex structure wherein the average depth (height) of said structure ranges from 0.01 to 30μ with the average number of surface roughening concavo-convex structures ranging from 1 to 10 13 per mm 2 , and wherein at least one of said anode and said cathode contacts one of the roughened surfaces of said membrane.
Claim 2
Dependent Claim
86 words
An electrolytic cell, which comprises: an anode and a cathode which are partitioned by an ion exchange membrane having at least one surface roughened, said surface roughening being defined by a fine concavo-convex structure wherein the average depth (height) of said structure ranges from 0.01 to 30μ with the average number of surface roughening concavo-convex structures ranging from 1 to 10 13 per mm 2 , and wherein at least one of said anode and said cathode contacts one of the roughened surfaces of said membrane.
Claim 3
Dependent Claim
31 words
The electrolytic cell of claim 1, wherein the electrode not in contact with said at least one roughened surface is separated from the membrane at a distance up to 2.0 mm.
Claim 4
Dependent Claim
36 words
The electrolytic cell of claim 1 or 2 wherein the electrode(s) positioned in contact with said at least one roughened surface is contacted with said membrane under a pressure of up to 10 kg/cm 2 .
Claim 5
Dependent Claim
19 words
The electrolytic cell of claim 1 or 2 wherein both surfaces of said ion exchange membrane are roughened surfaces.
Claim 6
Dependent Claim
46 words
The electrolytic cell of claim 1 or 2, wherein said concavo-convex structures of said at least one roughened surface have an average depth or height ranging from 0.5 to 10 at an average number of 10 to 10 12 per mm 2 of the surface area.
Claim 7
Dependent Claim
33 words
The electrolytic cell of claim 1 or 2 wherein said ion exchange membrane is a cation exchange membrane of a fluorinated polymer having sulfonic acid groups, carboxylic acid groups or phosphoric acid groups.
Claim 8
Dependent Claim
27 words
A process for electrolysis of an alkali metal chloride, which comprises: electrolyzing an aqueous solution of an alkali metal chloride in the electrolytic cell of claim 1.
Claim 9
Dependent Claim
31 words
The process of claim 7, wherein the electrode not in contact with said at least one roughened surface is separated from the membrane at a distance of up to 2.0 mm.
Claim 10
Dependent Claim
35 words
The process of claim 7 or 8 wherein the electrode(s) positioned in contact with said at least one roughened surface is contacted with said membrane under a pressure of up to 10 kg/cm 2 .
Claim 11
Dependent Claim
18 words
The process of claim 7 or 8, wherein both surfaces of said ion exchange membrane are roughened surfaces.
Claim 12
Dependent Claim
45 words
The process of claim 7 or 8, wherein said concavo-convex structures of said at least one roughened surface have an average depth or height ranging from 0.05 to 10μ at an average number of 10 to 10 12 per mm 2 of the surface area.
Claim 13
Dependent Claim
32 words
The process of claim 7 or 8, wherein said ion exchange membrane is a cation exchange membrane of a fluorinated polymer having sulfonic acid groups, carboxylic acid groups or phosphoric acid groups.
Claim 14
Dependent Claim
32 words
The process of claim 12 wherein said ion exchange membrane has a layer having sulfonic acid groups in the anode side and a layer having carboxylic acid groups in the cathode side.
Claim 15
Dependent Claim
27 words
The process of claim 12 wherein said ion exchange membrane is made of two kinds of polymers having carboxylic acid groups which have different ion exchange capacities.
Claim 16
Dependent Claim
47 words
The process of claim 7 or 8, wherein said electrolysis is performed under conditions in which the concentration of aqueous alkali metal chloride solution is of 2.5 to 5.0N, the temperature is 60° to 120° C., and the current density is 10 to 100 A/dm 2 .
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) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |