US4604170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layered diaphragm for electrolysis
Assignee: AGC Inc
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Filing: 1985-11-25
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Granted: 1986-08-05
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Expires: 2005-11-25
Abstract
Abstract A multi-layered diaphragm for electrolysis, which comprises a porous layer of a fluorine-containing polymer having a pore diameter of from 0.05 to 10 mu m, a porosity of from 30 to 95% and a thickness of from 30 to 450 mu m and with its interior and anode-side surface being hydrophilic, and an ion exchange resin layer supported on the cathode side thereof and having a thickness thinner than the porous layer but of at least 5 mu m and an ion exchange capacity of from 0.5 to 2.0 meq/g dry resin, the total thickness being from 35 to 500 mu m.
Inventors
- 👤 Haruhisa Miyake
- 👤 Manabu Suhara
- 👤 Yoshio Sugaya
- 👤 Hirofumi Horie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:05
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2275; C08J5/2281; C25B13/00; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
98 words
A multi-layered diaphragm for electrolysis, which comprises a porous layer of a fluorine-containing polymer having a pore diameter of from 0.05 to 10 μm, a porosity of from 30 to 95% and a thickness of from 30 to 450 μm and with its interior and anode-side surface being hydrophilic, and an ion exchange resin layer supported on the cathode side thereof and having a thickness thinner than the porous layer but of at least 5 μm and an ion exchange capacity of from 0.5 to 2.0 meq/g dry resin, the total thickness being from 35 to 500 μm.
Claim 2
Dependent Claim
98 words
A multi-layered diaphragm for electrolysis, which comprises a porous layer of a fluorine-containing polymer having a pore diameter of from 0.05 to 10 μm, a porosity of from 30 to 95% and a thickness of from 30 to 450 μm and with its interior and anode-side surface being hydrophilic, and an ion exchange resin layer supported on the cathode side thereof and having a thickness thinner than the porous layer but of at least 5 μm and an ion exchange capacity of from 0.5 to 2.0 meq/g dry resin, the total thickness being from 35 to 500 μm.
Claim 3
Dependent Claim
39 words
The diaphragm according to claim 1, wherein the porous layer with its surface and interior being hydrophilic is a porous layer with its interior coated with a hydrophilic resin and with its surface formed with a hydrophilic particle layer.
Claim 4
Dependent Claim
28 words
The diaphragm according to claim 1, wherein the porous layer with its surface and interior being hydrophilic is made of a fluorine-containing polymer containing a hydrophilic nature-imparting agent.
Claim 5
Dependent Claim
51 words
The diaphragm according to claim 1, wherein the ion exchange resin layer is made of at least two types of fluorine-containing polymers having sulfonic acid groups and/or carboxylic acid groups, the fluorine-containing layer located closest to the cathode being a fluorine-polymer layer having carboxylic acid groups having the smallest water content.
Claim 6
Dependent Claim
19 words
An electrolytic cell which comprises anode and cathode compartments partitioned by a multi-layered diaphragm as defined in claim 1.
Claim 7
Dependent Claim
29 words
The electrolytic cell according to claim 5, wherein the multi-layered diaphragm is disposed so that the porous layer faces the anode and the ion exchange layer faces the cathode.
Claim 8
Dependent Claim
24 words
The electrolytic cell according to claim 5, wherein at least one of the anode and the cathode are in contact with the multi-layered diaphragm.
Claim 9
Dependent Claim
24 words
The electrolytic cell according to claim 5, wherein an aqueous alkali metal chloride solution is electrolysed to obtain an alkali metal hydroxide and chlorine.
Claim 10
Dependent Claim
69 words
An electrolytic process which comprises electrolyzing an aqueous alkali metal chloride solution in the electrolytic cell as defined in claim 5, at a temperature of from 80° to 120° C. and at a current density of from 10 to 100 A/dm 2 while supplying a 2.5-5.0N alkali metal chloride aqueous solution to the anode compartment and water or a dilute alkali metal hydroxide aqueous solution to the cathode compartment.
References Cited (Backward Citations)
US3976549A
Cited
US4135996A
Cited
US4124458A
Cited
US4289600A
Cited
US4342636A
Cited
US4289601A
Cited
US4341615A
Cited
US4399009A
Cited
US4457815A
Cited
US4455210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |