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Patent US4468301A successfully refreshed from Google Patents.
US4468301A
Expired / Lapsed
US
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Ion exchange membrane cell and electrolytic process using thereof
Assignee: AGC Inc
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Filing: 1983-03-29
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Granted: 1984-08-28
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Expires: 2003-03-29
Abstract
Abstract A process for the electrolysis of an aqueous alkali metal chloride in a cell which comprises an anode and a cathode which are partitioned by an ion exchange membrane having at least one roughened surface. The electrodes are spaced apart in non-contacting relationship from the membrane surface up to a distance of no more than 2 mm.
Inventors
- 👤 Yoshio Oda
- 👤 Takeshi Morimoto
- 👤 Toshiya Matsubara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:19
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: 18
Claim 1
Independent Claim
90 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 (heighth) 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 said electrodes are spaced apart in non-contacting relationship from said membrane surfaces up to a distance of no more than 2 mm.
Claim 2
Dependent Claim
90 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 (heighth) 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 said electrodes are spaced apart in non-contacting relationship from said membrane surfaces up to a distance of no more than 2 mm.
Claim 3
Dependent Claim
32 words
The electrolytic cell according to claim 1 wherein said corresponding electrode is placed to close to said roughened surface of said ion exchange membrane at a distance of up to 1.0 mm.
Claim 4
Dependent Claim
18 words
The electrolytic cell according to claim 1 wherein both surfaces of said ion exchange membrane are roughened surfaces.
Claim 5
Dependent Claim
50 words
The electrolytic cell according to claim 1 or 2 wherein said roughened surface of said ion exchange membrane is formed by concavo-convex s. having an average depth or height ranging from 0.05 to 10μ at an average numbers of 10 to 10 12 per mm 2 of the surface area.
Claim 6
Dependent Claim
34 words
The electrolytic cell according to 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 7
Dependent Claim
90 words
An electrolytic cell, which comprises: an anode and a cathode which are partitioned by an ion exchange membrane having a roughened surface facing the anode, said surface roughening being defined by a fine concavo-convex structure wherein the average depth (heighth) 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 said anode being spaced apart in non-contacting relationship from said roughened surface up to a distance of no more than 2 mm.
Claim 8
Dependent Claim
90 words
An electrolytic cell, which comprises: an anode and a cathode which are partitioned by an ion exchange membrane having a roughened surface facing the anode, said surface roughening being defined by a fine concavo-convex structure wherein the average depth (heighth) 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 said anode being spaced apart in non-contacting relationship from said roughened surface up to a distance of no more than 2 mm.
Claim 9
Dependent Claim
20 words
The electrolytic cell according to claim 6, wherein said roughened surface is no more than 1 mm from said anode.
Claim 10
Dependent Claim
22 words
A process for electrolyzing an aqueous alkaline metal chloride solution which comprises electrolyzing said solution in the electrolysis cell of claim 6.
Claim 11
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 12
Dependent Claim
30 words
The process according to claim 9, wherein the electrode near said at least one roughened surface of said ion exchange membrane closes to a distance of up to 1.0 mm.
Claim 13
Dependent Claim
19 words
The process according to claim 9 or 10 wherein both surfaces of said ion exchange membrane are roughened surfaces.
Claim 14
Dependent Claim
49 words
The process according to claim 9 or 10 wherein said roughened surface of said ion exchange membrane is formed by concavo-convex s. having an average depth or height ranging from 0.05 to 10μ at an average numbers of 10 to 10 12 per mm 2 of the surface area.
Claim 15
Dependent Claim
33 words
The process according to claim 9 or 10 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 16
Dependent Claim
33 words
The process according to claim 13 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 17
Dependent Claim
28 words
The process according to claim 13 wherein said ion exchange membrane is made of two kinds of polymers having carboxylic acid groups which have different ion exchange capacities.
Claim 18
Dependent Claim
50 words
The process according to claim 9 or 10 wherein said electrolysis is performed under the condition of a concentration of an aqueous solution of an alkali metal chloride of 2.5 to 5.0N; a temperature of 60° to 120° C.; and a current density of 10 to 100 A/dm 2 .
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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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |