US4384941A
Expired / Lapsed
US
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Process for electrolyzing water
Assignee: Japan Atomic Energy Agency
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Filing: 1982-02-03
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Granted: 1983-05-24
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Expires: 2002-02-03
Abstract
Abstract A process is, herein, disclosed for electrolysis or pure water in an electrolytic cell which is divided into an anode compartment and a cathode compartment by a cation exchange membrane and in which pure water is supplied to the anode compartment for electrolysis to generate oxygen in the anode compartment and hydrogen in the cathode compartment, said cation exchange membrane being produced by grafting a fluorovinyl sulfonic acid monomer onto a membranous polymeric substrate having a monomer unit of the formula: ##STR1## (wherein X is hydrogen, fluorine or CH 3 ; and Y is hydrogen or fluorine), said cation exchange membrane being used in close contact with an anode and a cathode.
Inventors
- 👤 Jiro Okamoto
- 👤 Isao Ishigaki
- 👤 Hiroyuki Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:43
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/02; C25B1/04; C08; C08F; C08F255/00; C08F255/02; C08F259/00; C08F259/08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2243; C08J5/225; C25B9/00; C25B9/17; C25B9/19; C25B9/23; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A process for electrolysis of pure water in an electrolytic cell which is divided into an anode compartment and a cathode compartment by a cation exchange membrane and in which pure water is supplied to the anode compartment for electrolysis to generate oxygen in the anode compartment and hydrogen in the cathode compartment, said cation exchange membrane being produced by grafting a fluorovinyl sulfonic acid monomer onto a membranous polymeric substrate having a monomer unit of the formula: ##STR5## (wherein X is hydrogen, fluorine or CH 3 ; and Y is hydrogen or fluorine), said cation exchange membrane being used in close contact with an anode and a cathode.
Claim 2
Dependent Claim
109 words
A process for electrolysis of pure water in an electrolytic cell which is divided into an anode compartment and a cathode compartment by a cation exchange membrane and in which pure water is supplied to the anode compartment for electrolysis to generate oxygen in the anode compartment and hydrogen in the cathode compartment, said cation exchange membrane being produced by grafting a fluorovinyl sulfonic acid monomer onto a membranous polymeric substrate having a monomer unit of the formula: ##STR5## (wherein X is hydrogen, fluorine or CH 3 ; and Y is hydrogen or fluorine), said cation exchange membrane being used in close contact with an anode and a cathode.
Claim 3
Dependent Claim
43 words
A process according to claim 1 wherein the fluorovinyl sulfonic acid monomer has the formula: CF.sub.2 ═CF--CF.sub.2).sub.n SO.sub.2 Z (wherein n is 0 or 2, and Z is fluorine, hydroxyl group, NH 2 , ONH 4 or OM, M being an alkali metal).
Claim 4
Dependent Claim
33 words
A process according to claim 1 wherein the fluorovinyl sulfonic acid monomer has the formula: R.sub.1 --CF═CF--SO.sub.2 Z (wherein R 1 is fluorine or a perfluoroalkyl group having 1 to 5 carbon atoms).
Claim 5
Dependent Claim
31 words
A process according to claim 1 wherein the fluorovinyl sulfonic acid monomer has the formula: ##STR6## (wherein R 2 is fluorine or a perfluoroalkyl group having 1 to 5 carbon atoms).
Claim 6
Dependent Claim
48 words
A process according to claim 1 wherein the fluorovinyl sulfonic acid monomer has the formula: ##STR7## (wherein R 3 is fluorine or CH 3 ; R 4 is fluorine or a perfluoroalkyl group having 1 to 10 carbon atoms; and l is an integer of 1 to 3).
Claim 7
Dependent Claim
48 words
A process according to claim 1 wherein the fluorovinyl sulfonic acid monomer has the formula: ##STR8## (wherein R 5 is fluorine or CH 3 ; R 6 is fluorine or a perfluoroalkyl group having 1 to 10 carbon atoms; and k is an integer of 1 to 3).
Claim 8
Dependent Claim
17 words
A process according to claim 1 wherein the membranous polymeric substrate is supported by a reinforcing material.
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) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |