US4539085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous diaphragm for electrolytic cell
Assignee: Chloe Chimie SA
•
Filing: 1983-12-06
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Granted: 1985-09-03
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Expires: 2003-12-06
Abstract
Abstract A porous diaphragm for an electrolytic cell enables, e.g., the electrolysis of NaCl to NaOH, in high concentration and in good yield, said diaphragm comprising an electrolytically acceptable porous sheet member having a total pore volume and average equivalent pore diameter adapted for electrolysis, and having an ion exchange resin fixedly deposited within the pores and occupying from 8 to 30% of the total pore volume thereof.
Inventors
- 👤 Jean Bachot
- 👤 Jean Grosbois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:48
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/08
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
69 words
In an electrolyzing process carried out in an electrolytic cell comprising a porous diaphragm, the improvement which comprises utilizing as the diaphragm therefor, a porous diaphragm comprising an electrolytically acceptable porous sheet member having a total pore volume and average equivalent pore diameter adapted for electrolysis, and having an ion exchange resin fixedly deposited within the pores and occupying from 8 to 30% of the total pore volume thereof.
Claim 2
Dependent Claim
69 words
In an electrolyzing process carried out in an electrolytic cell comprising a porous diaphragm, the improvement which comprises utilizing as the diaphragm therefor, a porous diaphragm comprising an electrolytically acceptable porous sheet member having a total pore volume and average equivalent pore diameter adapted for electrolysis, and having an ion exchange resin fixedly deposited within the pores and occupying from 8 to 30% of the total pore volume thereof.
Claim 3
Dependent Claim
20 words
The process as defined by claim 1, the total pore volume of the diaphragm thereof ranging from 50 to 95%.
Claim 4
Dependent Claim
21 words
The process as defined by claim 2, the average equivalent pore diameter of the diaphragm ranging from 0.1 to 12 micrometers.
Claim 5
Dependent Claim
21 words
The process as defined by claim 3, the average equivalent pore diameter of the diaphragm ranging from 0.2 to 6 micrometers.
Claim 6
Dependent Claim
15 words
The process as defined by claim 1, said porous sheet member comprising a fluorinated resin.
Claim 7
Dependent Claim
13 words
The process as defined by claim 5, said fluorinated resin comprising a fluorocarbon.
Claim 8
Dependent Claim
13 words
The process as defined by claim 5, said fluorinated resin being fiber reinforced.
Claim 9
Dependent Claim
23 words
The process as defined by claim 1, said ion exchange resin being a polymerized, olefinically unsaturated carboxylic acid, or lower alkyl ester thereof.
Claim 10
Dependent Claim
33 words
The process as defined by claim 1, said ion exchange resin being a copolymer of an olefinically unsaturated carboxylic acid or lower alkyl ester thereof, and an olefinically unsaturated nonionic comonomer copolymerizable therewith.
Claim 11
Dependent Claim
19 words
The process as defined by claim 7, said nonionic comonomer comprising admixture of olefinically mono- and polyunsaturated nonionic comonomers.
Claim 12
Dependent Claim
19 words
The process as defined by claim 10, the molar ratio between said nonionic comonomers ranging from 0.1/1 to 10/1.
Claim 13
Dependent Claim
21 words
The process as defined by claim 9, said acid comonomer being acrylic or methacrylic acid, or methyl or ethyl ester thereof.
Claim 14
Dependent Claim
24 words
The process as defined by claim 9, said carboxylic acid comprising from 65 to 90% of the total amount by weight of the comonomers.
Claim 15
Dependent Claim
13 words
The process as defined by claim 1 said ion exchange resin being cross-linked.
Claim 16
Dependent Claim
23 words
The process as defined by claim 1, said ion exchange resin, when hydrated, occupying from 20 to 90% of said total pore volume.
Claim 17
Dependent Claim
23 words
The process as defined by claim 15, said ion exchange resin, when hydrated, occupying from 50 to 80% of said total pore volume.
Claim 18
Dependent Claim
21 words
The process as defined by claim 1, said ion exchange resin occupying from 10 to 20% of said total pore volume.
Claim 19
Dependent Claim
17 words
The process in accordance with claim 1, wherein alkali metal hydroxides are produced from alkali metal halides.
Claim 20
Dependent Claim
15 words
The process in accordance with claim 18, wherein sodium hydroxide is produced from sodium chloride.
Claim 21
Dependent Claim
31 words
The process in accordance with claim 18, wherein a brine feedstream to an anodic compartment of said cell is maintained at a concentration close to saturation under the conditions of use.
Claim 22
Dependent Claim
34 words
The process in accordance with claim 18, wherein the electrolyte potential of said cell is maintained so as to maintain the concentration of said hydroxide at the value desired, when withdrawn from said cell.
Claim 23
Dependent Claim
63 words
In an electrolytic cell comprising a porous diaphragm, the improvement which comprises utilizing as the diaphragm therefor, a porous diaphragm comprising an electrolytically acceptable porous sheet member having a total pore volume and average equivalent pore diameter adapted for electrolysis, and having an ion exchange resin fixedly deposited within the pores and occupying from 8 to 30% of the total pore volume thereof.
Claim 24
Dependent Claim
63 words
In an electrolytic cell comprising a porous diaphragm, the improvement which comprises utilizing as the diaphragm therefor, a porous diaphragm comprising an electrolytically acceptable porous sheet member having a total pore volume and average equivalent pore diameter adapted for electrolysis, and having an ion exchange resin fixedly deposited within the pores and occupying from 8 to 30% of the total pore volume thereof.
Claim 25
Dependent Claim
21 words
The electrolyte cell as defined by claim 22, the total pore volume of the diaphragm thereof ranging from 50 to 95%.
Claim 26
Dependent Claim
19 words
The electrolytic cell as defined by claim 23, the average equivalent pore diameter ranging from 0.1 to 12 micrometers.
Claim 27
Dependent Claim
19 words
The electrolytic cell as defined by claim 24, the average equivalent pore diameter ranging from 0.2 to 6 micrometers.
Claim 28
Dependent Claim
16 words
The electrolytic cell as defined by claim 22, said porous sheet member comprising a fluorinated resin.
Claim 29
Dependent Claim
14 words
The electrolytic cell as defined by claim 26, said fluorinated resin comprising a fluorocarbon.
Claim 30
Dependent Claim
14 words
The electrolytic cell as defined by claim 26, said fluorinated resin being fiber reinforced.
Claim 31
Dependent Claim
24 words
The electrolytic cell as defined by claim 22, said ion exchange resin being a polymerized, olefinically unsaturated carboxylic acid, or lower alkyl ester thereof.
Claim 32
Dependent Claim
34 words
The electrolytic cell as defined by claim 22, said ion exchange resin being a copolymer of an olefinically unsaturated carboxylic acid or lower alkyl ester thereof, and an olefinically unsaturated nonionic comonomer copolymerizable therewith.
Claim 33
Dependent Claim
20 words
The electrolytic cell as defined by claim 30, said nonionic comonomer comprising admixture of olefinically mono- and polyunsaturated nonionic comonomers.
Claim 34
Dependent Claim
20 words
The electrolytic cell as defined by claim 31, the molar ratio between said nonionic comonomers ranging from 0.1/1 to 10/1.
Claim 35
Dependent Claim
22 words
The electrolytic cell as defined by claim 30, said acid comonomer being acrylic or methacrylic acid, or methyl or ethyl ester thereof.
Claim 36
Dependent Claim
25 words
The electrolytic cell as defined by claim 22, said carboxylic acid comprising from 65 to 90% of the total amount by weight of the comonomers.
Claim 37
Dependent Claim
14 words
The electrolytic cell as defined by claim 22, said ion exchange resin being cross-linked.
Claim 38
Dependent Claim
24 words
The electrolytic cell as defined by claim 22, said ion exchange resin, when hydrated, occupying from 20 to 90% of said total pore volume.
Claim 39
Dependent Claim
24 words
The electrolytic cell as defined by claim 36, said ion exchange resin, when hydrated, occupying from 50 to 80% of said total pore volume.
Claim 40
Dependent Claim
22 words
The electrolytic cell as defined by claim 22, said ion exchange resin occupying from 10 to 20% of said total pore volume.
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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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |