US3968273A
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US
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Method of making electrode for preparing hydrogen peroxide
Assignee: Forschungszentrum Jülich
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Filing: 1974-10-23
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Granted: 1976-07-06
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Expires: 1994-10-23
Abstract
Abstract A method of making an electrode for preparing hydrogen peroxide, accordingo which active carbon during application of heat is mixed with a binder and a hydrophobic substance of addition. The thus obtained mixture is applied to an electrically conductive carrier structure. More specifically, active carbon is glowed in a vacuum at a temperature above 900°, preferably at a temperature of from 1000° to 1250°C. After the active carbon powder has been cooled in a vacuum, the active carbon powder is mixed with a solvent containing the binder and the hydrophobic substance of addition. The thus obtained mixture is applied to the electric conductive carrier substance. Finally, the mixture thus applied to the carrier structure is dried. The thus produced electrode is arranged in an electrolytic cell filled with an electrolyte. This cell comprises a gas permeable carbon cathode communicating with a gas chamber in which a pressure higher than atmospheric pressure prevails and also comprises an anode separated from the carbon cathode by a diaphragm. As carbon electrode there is used a carrier structure coated with active carbon powder which by means of a non-coated side facing away from the gas chamber rests on a metallic grate.
Inventors
- 👤 Bertel Kastening
- 👤 Wolfgang Faul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:52
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/28; C25B1/30; C25B11/00; C25B11/04; C25B11/042; C25B11/043
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
88 words
A method of making an electrode for preparing hydrogen peroxide, which includes the steps of: glowing active carbon powder in a vacuum at a temperature above 900°C, cooling the thus treated active carbon powder in a vacuum, mixing the thus cooled active carbon powder with a solvent containing a binder and a hydrophobic additional substance, applying the thus obtained mixture onto an electrically conductive carrier structure, drying said mixture applied onto said carrier structure, and glowing said active carbon powder for a period of at least 30 minutes.
Claim 2
Independent Claim
88 words
A method of making an electrode for preparing hydrogen peroxide, which includes the steps of: glowing active carbon powder in a vacuum at a temperature above 900°C, cooling the thus treated active carbon powder in a vacuum, mixing the thus cooled active carbon powder with a solvent containing a binder and a hydrophobic additional substance, applying the thus obtained mixture onto an electrically conductive carrier structure, drying said mixture applied onto said carrier structure, and glowing said active carbon powder for a period of at least 30 minutes.
Claim 3
Dependent Claim
17 words
A method according to claim 1, in which said vacuum amounts to from 0.1 to 10 Torr.
Claim 4
Dependent Claim
23 words
A method according to claim 1, in which said active carbon powder is glowed within a temperature range of from 1000°C to 1250°C.
Claim 5
Dependent Claim
38 words
A method according to claim 1, which includes the steps of screening the cooled active carbon powder and preparing said binder and hydrophobic additional substance mixture with active carbon particles having a granular size up to 80 μm.
Claim 6
Dependent Claim
45 words
A method according to claim 1, which includes the step of adding to said mixture per each 100 ml solvent from 2 to 10 grams of active carbon powder, from 0.2 to 1 gram of caoutchouc material, and from 0.1 to 1 gram of paraffin.
Claim 7
Dependent Claim
27 words
A method according to claim 1, which includes the step of employing as carrier structure a metal wire net having meshes of from 0.05 to 0.3 millimeters.
Claim 8
Dependent Claim
36 words
A method according to claim 6, which includes applying to the marginal zones of said metal wire net preliminarily a protective layer prior to applying thereto said binder and hydrophobic additional substance mixture containing the solvents.
Claim 9
Dependent Claim
14 words
A method according to claim 7, in which said protective layer includes hydrophobic components.
Claim 10
Dependent Claim
31 words
A method according to claim 8, in which the protective layer is applied in the form of a solution containing from 1 to 3 grams caoutchouc material per 100 ml solvent.
Claim 11
Dependent Claim
21 words
A method according to claim 7, in which the hydrophobic components are the same that are added when preparing said mixture.
Claim 12
Dependent Claim
32 words
A method according to claim 1, which includes the step of treating the covered surface of the carrier structure following the drying of said carrier structure with a spray substance containing polytetrafluoroethylene.
Claim 13
Independent Claim
95 words
A method of making an electrode for preparing hydrogen peroxide, which includes the steps of: glowing active carbon powder in a vacuum at a temperature above 900° C, cooling the thus treated active carbon powder in a vacuum, mixing the thus cooled active carbon powder with a solvent containing a binder and a hydrophobic additional substance, applying the thus obtained mixture onto an electrically conductive carrier structure, and drying said mixture applied onto said carrier structure, the glowing of said active carbon powder being effected for a time period of from 2 to four hours.
Claim 14
Independent Claim
95 words
A method of making an electrode for preparing hydrogen peroxide, which includes the steps of: glowing active carbon powder in a vacuum at a temperature above 900° C, cooling the thus treated active carbon powder in a vacuum, mixing the thus cooled active carbon powder with a solvent containing a binder and a hydrophobic additional substance, applying the thus obtained mixture onto an electrically conductive carrier structure, and drying said mixture applied onto said carrier structure, the glowing of said active carbon powder being effected for a time period of from 2 to four hours.
Claim 15
Dependent Claim
17 words
A method according to claim 12, in which said vacuum amounts to from 0.1 to 10 Torr.
Claim 16
Dependent Claim
23 words
A method according to claim 12, in which said active carbon powder is glowed within a temperature range of from 1000°C to 1250°C.
Claim 17
Dependent Claim
38 words
A method according to claim 12, which includes the steps of screening the cooled active carbon powder and preparing said binder and hydrophobic additional substance mixture with active carbon particles having a granular size up to 80 μm.
Claim 18
Dependent Claim
45 words
A method according to claim 12, which includes the step of adding to said mixture per each 100 ml solvent from 2 to 10 grams of active carbon powder, from 0.2 to 1 gram of caoutchouc material, and from 0.1 to 1 gram of paraffin.
Claim 19
Dependent Claim
27 words
A method according to claim 12, which includes the step of employing as carrier structure a metal wire net having meshes of from 0.05 to 0.3 millimeters.
Claim 20
Dependent Claim
32 words
A method according to claim 12, which includes the step of treating the covered surface of the carrier structure following the drying of said carrier structure with a spray substance containing polytetrafluoroethylene.
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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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |