Patent US4741813A successfully refreshed from Google Patents.
US4741813A
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US
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Diaphragm for an electrolytic cell
Assignee: Oxytech Systems Inc
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Filing: 1986-12-15
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Granted: 1988-05-03
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Expires: 2006-12-15
Abstract
Abstract An improved diaphragm for an electrolytic cell is prepared by mixing a slurry of asbestos fibers with a dispersion of titanium dioxide in isopropyl alcohol, depositing the treated asbestos fibers onto a cathode, heating the diaphragm to an elevated temperature of from about 100° C. to about 300° C., and allowing the diaphragm to cool. The diaphragm prepared according to this process exhibits improved mechanical strength and integrity as well as a decrease in electrical energy consumption in comparison to diaphragms prepared using conventional techniques.
Inventors
- 👤 Arthur C. Schulz
- 👤 Robert Kiszewski
- 👤 Ursula I. Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:51
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/05; C25B13/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A process for preparing a diaphragm for use in an elecrrolytic cell comprising the steps of: (a) forming an aqueous dispersion of at least one valve metal oxide and at least one water-soluble solvent which is capable of wetting the valve metal oxide and asbestos fibers the valve metal oxide being selected from the group consisting of the oxides of titanium, zirconium, hafnium, niobium, tantalum, tungsten, and mixtures thereof, (b) mixing the dispersion with asbestos fibers to form a slurry, (c) immersing a cathode in the slurry and depositing a uniform mixture of slurry solids onto the cathode, (d) heating the diaphragrm-deposited cathode at a temperature of at least about 100° C. to cure the diaphragm, and (e) allowing the diaphragm to cool.
Claim 2
Dependent Claim
123 words
A process for preparing a diaphragm for use in an elecrrolytic cell comprising the steps of: (a) forming an aqueous dispersion of at least one valve metal oxide and at least one water-soluble solvent which is capable of wetting the valve metal oxide and asbestos fibers the valve metal oxide being selected from the group consisting of the oxides of titanium, zirconium, hafnium, niobium, tantalum, tungsten, and mixtures thereof, (b) mixing the dispersion with asbestos fibers to form a slurry, (c) immersing a cathode in the slurry and depositing a uniform mixture of slurry solids onto the cathode, (d) heating the diaphragrm-deposited cathode at a temperature of at least about 100° C. to cure the diaphragm, and (e) allowing the diaphragm to cool.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the diaphragm is heated at a temperature of from about 100° C. to about 300° c.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the valve metal oxide is titanium dioxide.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein at least one solvent is an alkanol.
Claim 6
Dependent Claim
10 words
The process of claim 4 wherein the alkanol is isopropanol.
Claim 7
Dependent Claim
13 words
The process of claim 5 wherein the valve metal oxide is titanium dioxide.
Claim 8
Dependent Claim
12 words
The process of claim 6 wherein the dispersion includes a wetting agent.
Claim 9
Dependent Claim
17 words
The process of claim 7 wherein the wetting agent is a non-ionic octyl phenoxy polyethoxy ethanol compound.
Claim 10
Dependent Claim
14 words
The process of claim 1 wherein the cell is an electrolytic chlor-alkali diaphragm cell.
Claim 11
Dependent Claim
11 words
A chlor-alkali cell diaphragm prepared by the process of claim 9.
References Cited (Backward Citations)
US4410411A
Cited
US4003818A
Cited
CA1027898A
Cited
US4142951A
Cited
US4180449A
Cited
US4173526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |