US4465570A
Expired / Lapsed
US
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Process for producing hydrogen
Assignee: AGC Inc
•
Filing: 1982-09-30
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Granted: 1984-08-14
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Expires: 2002-09-30
Abstract
Abstract A process for producing hydrogen by an electrolysis of water with an aqueous solution of an alkali hydroxide is provided. It is to use an electrolytic cell prepared by bonding a gas and liquid permeable anode on one surface of a cation-exchange membrane of a fluorinated polymer and a gas and liquid permeable cathode on the other surface of the membrane. An economical metal can be used as the substance for the electrolytic cell. Hydrogen can be produced at a low voltage in stable for a long time.
Inventors
- 👤 Yoshio Oda
- 👤 Takeshi Morimoto
- 👤 Kohji Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:52
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/02; C25B1/04; C25B9/00; C25B9/17; C25B9/19; C25B9/23; C25B9/60; C25B9/65; C25B9/70; C25B9/73; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A process for producing hydrogen by electrolysis, which comprises: passing an aqueous solution of an alkali hydroxide into the anode compartment of an electrolysis cell containing an electrode configuration of a gas and liquid permeable anode bonded to one surface of a fluorinated polymer cation exchange membrane having carboxylic acid groups of an ion exchange capacity of 0.5 to 4.0 meg/g dry resin and a gas and liquid permeable cathode bonded to the remaining surface of said membrane; and electrolyzing the aqueous solution in said cell.
Claim 2
Dependent Claim
86 words
A process for producing hydrogen by electrolysis, which comprises: passing an aqueous solution of an alkali hydroxide into the anode compartment of an electrolysis cell containing an electrode configuration of a gas and liquid permeable anode bonded to one surface of a fluorinated polymer cation exchange membrane having carboxylic acid groups of an ion exchange capacity of 0.5 to 4.0 meg/g dry resin and a gas and liquid permeable cathode bonded to the remaining surface of said membrane; and electrolyzing the aqueous solution in said cell.
Claim 3
Dependent Claim
25 words
The process according to claim 1 wherein the concentration of said aqueous alkali hydroxide solution is in a range of 5 to 45 wt. %.
Claim 4
Dependent Claim
41 words
The process according to claim 1 wherein said gas and liquid permeable anode and cathode each have an average pore diameter of 0.01 to 30μ, a porosity of 30 to 90% and an air permeability of 1×10 -6 mole/cm 2 .min.cmHg.
Claim 5
Dependent Claim
43 words
The process according to claim 1 wherein said gas and liquid permeable anode is formed from a platinum group metal, an alloy of a platinum group metal or an oxide of said metal or alloy thereof, graphite, nickel or an oxide containing nickel.
Claim 6
Dependent Claim
33 words
The process according to claim 1 or 4 wherein said gas and liquid permeable cathode is made of iron, nickel stainless steel or stabilized Raney nickel or a carbon supporting a precious metal.
Claim 7
Dependent Claim
37 words
The process according to claim 1, 2 or 4 wherein said cation-exchange membrane is formed from a perfluorocopolymer having carboxylic acid groups as cation-exchange groups which have an ion-exchange capacity of 0.5 to 4.0 meq/g dry resin.
Claim 8
Dependent Claim
92 words
The process according to claim 6 wherein said perfluorocopolymer contains the units (A) and (B): ##STR3## wherein X represents --F or --CF 3 ; X' represents X or CF 3 (CF 2 )--m; m is 1 to 5; Y represents --(CF 2 ) a --A, --O--(CF 2 ) a --A, --(O--CF 2 --CF) b --A, ##STR4## and a, b and c each range from 0 to 6; A represents, --COOM--, wherein M is hydrogen or an alkali metal atom, or a functional group which can be converted into said group by hydrolysis.
Claim 9
Dependent Claim
33 words
The process according to claim 1, 2, or 4 wherein said aqueous alkali hydroxide solution produced in said cathode compartment is recycled as the aqueous alkali hydroxide solution fed into said anode compartment.
Claim 10
Dependent Claim
131 words
A process for producing hydrogen by electrolysis, which comprises: passing an aqueous solution of an alkali hydroxide into the anode compartment of an electrolysis cell containing an electrode configuration of a gas and liquid permeable anode formed from a platinum group metal, an alloy of a platinum group metal or an oxide of said metal or alloy thereof, graphite, nickel or a nickel containing oxide, bonded to one surface of a fluorinated polymer cationic exchange membrane having carboxylic acid groups of an ion exchange capacity of 0.5 to 4.0 meq/g dry resin and a gas and liquid permeable cathode formed from iron, nickel, stainless steel, or stabilized Raney nickel or carbon supporting a precious metal bonded to the remaining surface of said membrane; and electrolyzing the aqueous solution in said cell.
Claim 11
Dependent Claim
131 words
A process for producing hydrogen by electrolysis, which comprises: passing an aqueous solution of an alkali hydroxide into the anode compartment of an electrolysis cell containing an electrode configuration of a gas and liquid permeable anode formed from a platinum group metal, an alloy of a platinum group metal or an oxide of said metal or alloy thereof, graphite, nickel or a nickel containing oxide, bonded to one surface of a fluorinated polymer cationic exchange membrane having carboxylic acid groups of an ion exchange capacity of 0.5 to 4.0 meq/g dry resin and a gas and liquid permeable cathode formed from iron, nickel, stainless steel, or stabilized Raney nickel or carbon supporting a precious metal bonded to the remaining surface of said membrane; and electrolyzing the aqueous solution in said cell.
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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) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |