US4302303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeable diaphragm for an electrochemical cell
Assignee: Solvay SA
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Filing: 1980-10-17
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Granted: 1981-11-24
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Expires: 2000-10-17
Abstract
Abstract The invention relates to a permeable diaphragm for an electrochemical cell. The diaphragm consists of a sheet of fibrous, organic polymeric material, obtained from a suspension of the said polymeric material in an organic liquid. The invention applies to permeable diaphragms for cells for the electrolysis of aqueous sodium chloride solutions.
Inventors
- 👤 Robert Guillaume
- 👤 Jean-Pierre Pleska
- 👤 Jean Indeherbergh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:43
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
51 words
A method for the manufacture of chlorine and hydrogen gases comprising electrolyzing an aqueous solution of alkali metal chloride in an electrolytic cell containing a permeable diaphragm comprised of a porous sheet of a fibrous organic polymeric material obtained from a suspension of the fibrous polymeric material in an organic liquid.
Claim 2
Independent Claim
51 words
A method for the manufacture of chlorine and hydrogen gases comprising electrolyzing an aqueous solution of alkali metal chloride in an electrolytic cell containing a permeable diaphragm comprised of a porous sheet of a fibrous organic polymeric material obtained from a suspension of the fibrous polymeric material in an organic liquid.
Claim 3
Dependent Claim
15 words
A method according to claim 1, in which the fibrous polymeric material consists of fibrils.
Claim 4
Dependent Claim
17 words
A method according to claim 1, in which the fibrous polymeric material consists of a fluorinated polymer.
Claim 5
Dependent Claim
36 words
A method according to claim 1, in which the fibrous polymeric material and the organic liquid are chosen so that the difference between their respective solubility parameters is less than 5 (cal/cm 3 ) 1/2 .
Claim 6
Dependent Claim
25 words
A method according to claim 1, in which the organic liquid is chosen from amongst those having a surface tension of at most 40 dynes/cm.
Claim 7
Dependent Claim
16 words
A method according to claim 1, in which the organic liquid is chosen from amongst halogenohydrocarbons.
Claim 8
Dependent Claim
35 words
A method according to claim 1, in which said diaphragm is obtained from a suspension of the fibrous polymeric material in the organic liquid, containing from 1 to 10% by weight of fibrous polymeric material.
Claim 9
Dependent Claim
32 words
A method according to claim 1, in which said diaphragm is obtained by beating the suspension of fibrous polymeric material so that it possesses a Schopper-Riegler number of between 30 and 75.
Claim 10
Dependent Claim
48 words
A method according to claim 1, in which said diaphragm is obtained by drying the sheet, and then heating said sheet at 100° C. or above for at least one hour, and then treating said sheet with a liquid having a surface tension of at most 40 dynes/cm.
Claim 11
Independent Claim
76 words
A method according to any one of claims 2 to 9, or 1, in which the specific surface area of said diaphragm is between 5 and 15 m 2 /g and its permeability, expressed by the flow, in cm 3 /hour, of saturated sodium chloride brine, at 80° C., passing through a 1 cm 2 surface area of the diaphragm under a hydrostatic pressure corresponding to a 1 cm brine column, is between 0.07 and 0.3.
Claim 12
Dependent Claim
18 words
A method according to claim 1 on which said diaphragm consists essentially of fibrils of a fluorinated polymer.
Claim 13
Independent Claim
41 words
A method according to one of claims 2, 3 or 11 in which the fibrous polymeric material and the organic liquid are chosen so that the difference between their respective solubility parameters is less than 5 (cal./cm. 3 ) 1/2 .
Claim 14
Independent Claim
26 words
A method according to one of claims 2, 3, 4 or 11 in which the organic liquid has a surface tension of at most 40 dynes/cm.
Claim 15
Independent Claim
21 words
A method according to one of claims 2, 3, 4, 5 or 11 in which the organic liquid is a halogenohydrocarbon.
Claim 16
Independent Claim
42 words
A method according to one of claims 2, 3, 4, 5 or 6 in which said diaphragm is obtained from a suspension of the fibrous polymeric material in the organic liquid containing from 1 to 10% by weight of fibrous polymeric material.
Claim 17
Independent Claim
39 words
A method according to one of claims 2, 3, 4, 5, 6 or 7 in which said diaphragm is obtained by beating the suspension of fibrous polymeric material so that it possesses a Schopper-Riegler number between 30 and 75.
Claim 18
Independent Claim
57 words
A method according to one of claims 2, 3, 4, 6, 7, 8 or 11 in which said diaphragm is obtained by drying the sheet and then heating said sheet to at least 100° C. for at least one hour and then treating said sheet with a liquid having a surface tension of at most 40 dynes/cm.
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) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |