US4119503A
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Two layer ceramic membranes and their uses
Assignee: De Nora SpA
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Filing: 1977-11-28
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Granted: 1978-10-10
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Expires: 1997-11-28
Abstract
Abstract Novel two layer ceramic membranes for electrolysis cells comprising on the anodic side a layer of at least one oxide selected from the group consisting of Sb 2 O 5 , Bi 2 O 5 , MoO 3 , WO 3 and V 2 O 5 and on the cathodic side a layer of at least one oxide selected from the group consisting of ZrO 2 , Nb 2 O 5 , Ta 2 O 5 and TiO 2 , electrodes provided with a two layer ceramic membrane applied thereto, an electrolysis cell provided with a two layer ceramic oxide membrane and an electrolysis process wherein a two layer ceramic membrane is in the electrodic gap.
Inventors
- 👤 Placido Maria Spaziante
- 👤 Antonio Nidola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:21
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C25B13/05; C25B13/07
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
89 words
A two layer ceramic oxide membrane for electrolysis cells comprising a membrane having on the anodic side a layer of at least one oxide selected from the group consisting of Sb 2 O 5 , Bi 2 O 5 , MoO 3 , WO 3 , V 2 O 5 and mixtures thereof and on the cathodic side a layer of at least one oxide selected from the group consisting of ZrO 2 , Nb 2 O 5 , Ta 2 O 5 , TiO 2 and mixtures thereof.
Claim 2
Dependent Claim
89 words
A two layer ceramic oxide membrane for electrolysis cells comprising a membrane having on the anodic side a layer of at least one oxide selected from the group consisting of Sb 2 O 5 , Bi 2 O 5 , MoO 3 , WO 3 , V 2 O 5 and mixtures thereof and on the cathodic side a layer of at least one oxide selected from the group consisting of ZrO 2 , Nb 2 O 5 , Ta 2 O 5 , TiO 2 and mixtures thereof.
Claim 3
Dependent Claim
16 words
The membrane of claim 1 wherein the membrane is ZrO 2 -Sb 2 O 5 .
Claim 4
Dependent Claim
14 words
The membrane of claim 1 wherein the cathodic side layer is ZrO 2 .
Claim 5
Dependent Claim
16 words
The membrane of claim 1 wherein the anodic side layer is Sb 2 O 5 .
Claim 6
Dependent Claim
15 words
The membrane of claim 1 wherein the membrane is not more than 500 μm thick.
Claim 7
Dependent Claim
99 words
An electrode structure comprising an electrically conductive substrate having on the side towards the electrodic gap a two layer ceramic oxide membrane having on the anodic side a layer of at least one oxide selected from the group consisting of Sb 2 O 5 , Bi 2 O 5 , MoO 3 , WO 3 , V 2 O 5 and mixtures thereof and on the cathodic side a layer of at least one oxide selected from the group consisting of ZrO 2 , Nb 2 O 5 , Ta 2 O 5 , TiO 2 and mixtures thereof.
Claim 8
Dependent Claim
99 words
An electrode structure comprising an electrically conductive substrate having on the side towards the electrodic gap a two layer ceramic oxide membrane having on the anodic side a layer of at least one oxide selected from the group consisting of Sb 2 O 5 , Bi 2 O 5 , MoO 3 , WO 3 , V 2 O 5 and mixtures thereof and on the cathodic side a layer of at least one oxide selected from the group consisting of ZrO 2 , Nb 2 O 5 , Ta 2 O 5 , TiO 2 and mixtures thereof.
Claim 9
Dependent Claim
15 words
The electrode structure of claim 6 wherein the cathodic side layer is ZrO 2 .
Claim 10
Dependent Claim
17 words
The electrode structure of claim 6 wherein the anodic side layer is Sb 2 O 5 .
Claim 11
Dependent Claim
17 words
The electrode structure of claim 6 wherein the membrane is ZrO 2 -Sb 2 O 5 .
Claim 12
Dependent Claim
28 words
The electrode structure of claim 6 wherein the substrate is a valve metal provided with an electrocatalytic coating containing a platinum group metal oxide on its active surface.
Claim 13
Dependent Claim
11 words
The electrode structure of claim 9 wherein the substrate is titanium.
Claim 14
Dependent Claim
13 words
The electrode structure of claim 6 wherein the substrate is a ferrous metal.
Claim 15
Dependent Claim
17 words
The electrode structure of claim 12 wherein the membrane is ZrO 2 -Sb 2 O 5 .
Claim 16
Dependent Claim
123 words
In an electrolysis cell comprised of a cell having provided with electrolyte inlet and outlet means, at least one electrode pair of an anode and a cathode, means for impressing a direct current on the cell and means for recovering the electrolysis products, the improvement comprising a two layer ceramic oxide membrane on one of the electrodes with the phase towards the anolyte being selected from the group consisting of Sb 2 O 5 , Bi 2 O 5 , MoO 3 , WO 3 , V 2 O 5 and mixtures thereof and the phase towards catholyte being selected from the group consisting of ZrO 2 , Nb 2 O 5 , Ta 2 O 5 , TiO 2 and mixtures thereof.
Claim 17
Dependent Claim
123 words
In an electrolysis cell comprised of a cell having provided with electrolyte inlet and outlet means, at least one electrode pair of an anode and a cathode, means for impressing a direct current on the cell and means for recovering the electrolysis products, the improvement comprising a two layer ceramic oxide membrane on one of the electrodes with the phase towards the anolyte being selected from the group consisting of Sb 2 O 5 , Bi 2 O 5 , MoO 3 , WO 3 , V 2 O 5 and mixtures thereof and the phase towards catholyte being selected from the group consisting of ZrO 2 , Nb 2 O 5 , Ta 2 O 5 , TiO 2 and mixtures thereof.
Claim 18
Dependent Claim
14 words
The cell of claim 14 wherein the cathodic side layer is ZrO 2 .
Claim 19
Dependent Claim
16 words
The cell of claim 14 wherein the anodic side layer is Sb 2 O 5 .
Claim 20
Dependent Claim
16 words
The cell of claim 14 wherein the membrane is ZrO 2 -Sb 2 O 5 .
Claim 21
Dependent Claim
12 words
The cell of claim 14 wherein the membrane is on the anode.
Claim 22
Dependent Claim
12 words
The cell of claim 14 wherein the membrane is on the cathode.
Claim 23
Dependent Claim
27 words
The cell of claim 18 wherein the anode is a valve metal provided with an electrocatalytic coating containing a platinum group metal oxide on its active surface.
Claim 24
Dependent Claim
14 words
The cell of claim 19 wherein the cathode is made of a ferrous metal.
Claim 25
Dependent Claim
44 words
In an electrolysis process comprising electrolyzing an electrolyte between an anode and a cathode with a direct current, the improvement comprising providing one of the said electrode on its side toward the electrodic gap with a two phase ceramic oxide membrane of claim 1.
Claim 26
Dependent Claim
12 words
The process of claim 22 wherein the membrane is on the cathode.
Claim 27
Dependent Claim
12 words
The process of claim 22 wherein the membrane is on the anode.
Claim 28
Dependent Claim
14 words
The process of claim 22 wherein the cathodic side layer is ZrO 2 .
Claim 29
Dependent Claim
16 words
The process of claim 22 wherein the anodic side layer is Sb 2 O 5 .
Claim 30
Dependent Claim
16 words
The process of claim 22 wherein the membrane is ZrO 2 -Sb 2 O 5 .
Claim 31
Dependent Claim
27 words
The process of claim 22 wherein the anode is a valve metal provided with an electrocatalytic coating containing a platinum group metal oxide on its active surface.
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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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |