WO2005001163A1 - Expandable anode for diaphragm cells - Google Patents
Expandable anode for diaphragm cells Download PDFInfo
- Publication number
- WO2005001163A1 WO2005001163A1 PCT/EP2004/006791 EP2004006791W WO2005001163A1 WO 2005001163 A1 WO2005001163 A1 WO 2005001163A1 EP 2004006791 W EP2004006791 W EP 2004006791W WO 2005001163 A1 WO2005001163 A1 WO 2005001163A1
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- WO
- WIPO (PCT)
- Prior art keywords
- openings
- plates
- component
- millimetres
- sheet
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/02—Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form
Definitions
- chlorine- caustic soda or chlor-alkali in general electrolysis is carried out on the basis of three types of technologies, namely the mercury cathode, diaphragm and membrane one.
- the latter type of electrolysis is the most advanced and represents since a few years the only option left for the construction of new plants in view of the lower electrical energy costs and of the near-zero environmental impact, while the mercury cathode and diaphragm technologies survive in already paid-off plants wherein the higher variable costs are balanced at least in part by the lower fixed costs.
- the "box” anodes born as replacements of the old graphite anodes of which they substantially maintain the external shape (see for example US 3,591 ,483), consist of a titanium sheet provided with openings, folded so as to form an empty box (whence the name) shaped as a rectangular base prism.
- the anodes which are secured in a multiplicity of parallel rows to a supporting and electrical current-distributing base, are intercalated between corresponding rows of cathodes, also shaped as flat boxes formed by perforated sheets or metal wire meshes coated with a porous diaphragm consisting of, as previously said, inert fibres stabilised by a polymer binder.
- This operation of intercalation is quite delicate and, in order to avoid that the diaphragms be damaged by strokes or rubbing against the anodes, the same anodes have sensibly lower width than the existing gap between the rows of diaphragm-bearing cathodes. It follows that, during operation, the sensible gap existing between anodes and diaphragms (6-8 mm indicatively) entails a high voltage, to which corresponds a high electrical energy consumption.
- expandable anodes were introduced, again shaped as a flat box, but with the two major surfaces secured to expanding devices (expanders) consisting of titanium sheets endowed with elasticity.
- expanding devices expanders
- the surfaces have a certain mobility, which allows them, precisely under the push of the expanders, to get closer or farther away while remaining mutually parallel (see for example US 3,674,676).
- the anodes are maintained in a restrained position by suitable retainers, thereby assuming a reduced width allowing to prevent damages to the diaphragms.
- the retainers are extracted leaving the anode surfaces free to expand under the effect of the intrinsic elasticity of the structure.
- the retainer extraction does not present any particular difficulty since in the phase of anode assemblage between the rows of cathodes, the electrolyser is free of cover, and thus the access to the anodes is entirely free.
- the expansion of this kind of anode might be adjusted so as to bring the major surfaces consisting of sheets provided with apertures and catalytic coating in direct contact with the diaphragm surfaces
- the expanded sheets are obtained making use of 1 mm thick titanium sheets as the starting material, and the expansion is adjusted so as to produce openings of typical rhomboidal shape whose diagonals are about 10 and 15 mm long.
- the thickness of 1 mm for the starting sheet is needed to ensure a sufficient electrical conduction, and hence a homogeneous current distribution: in its turn, such thickness of 1 mm imposes, for the mechanical expansion, the above seen dimensions of the rhomboidal opening diagonals. With these dimensions, a partial penetration of the anode surfaces into the diaphragms cannot be avoided, leading to a further damaging to their integrity.
- the safety distance of about 3 millimetres is commonly ensured by introducing spacers in the form of plastic rods or buttons between the movable surfaces of the anodes and the diaphragms.
- the anodes are further provided with brine recirculation means having the purpose of favouring the mass transport of chlorides toward the anode surface catalytic coating in order to facilitate the evolution of chlorine while hindering that of oxygen, which is a typical by-product of reaction.
- brine recirculation means consist of suitable internal ducts created by sheets introduced within the "box"-type anodes, as disclosed in US 4,138,295, or by an adequate shaping of the expanders, as proposed in US 5,593,555 precisely for expandable-type anodes.
- the finite distance between the surfaces of the diaphragms and those of the anodes after expansion entails a higher cell voltage due to the ohmic drop inside the brine film just located between such surfaces: assuming that the gas content in such film doesn't affect the electrical resistivity of brine to a substantial extent, it can be determined that to a gap of 3 mm (imposed as said above by the spacers of common use in the industrial practice) corresponds a ohmic drop of about 0.1 Volts.
- the real ohmic drop results considerably higher and close to 0.3 Volts when the diaphragm is of the type based on asbestos fibres mechanically stabilised with perfluorinated-type polymeric binders, still largely in use.
- the thin sheet provided with small sized openings has the purpose of blocking the diaphragm swelling by applying a much more distributed compression force: this feature, together with the regularity of the surface, substantially free of asperities as a consequence of the flattening treatment, guarantees that no significant damage is produced to the diaphragms.
- To the unflattened thicker sheet is deputed the task of optimally distributing the electric current while preventing the deformations which would be unavoidable with the thin sheet alone.
- Diaphragm chlor-alkali electrolysis cells operating at a current density of 2000 A/m 2 and equipped with anodes provided with the composite structure just described and with the means for brine recirculation, for instance according to US 5,534,122, are characterised by a voltage 0.1-0.15 Volts lower than the voltages of cells provided with anodes and spacers according to the prior art. Such certainly interesting result is nevertheless inferior to the previously indicated expected value of about 0.3 Volts.
- the electrode may be employed in many electrochemical applications and in particular as anode (and optionally as cathode) in diaphragm cells, with the plate edges positioned, as already seen, at a certain distance from the diaphragm to prevent mechanical damages.
- This purpose is at the basis of the instant invention, which under a first aspect is directed to an electrode for cells provided with separator and particularly, although not exclusively, for diaphragm chlor-alkali cells and more particularly to an anodic structure provided with at least one movable surface suited to be installed in diaphragm chlor-alkali cells in direct contact with the diaphragm itself without any risk of mechanical damages.
- the movable surface is provided with elements capable of inducing an effective local recirculation of brine.
- the invention discloses an anode for cells provided with separator, particularly for diaphragm chlor-alkali cells, capable of ensuring a substantial reduction of the electrolysis voltage.
- anode of the invention is characterised by producing chlorine with lower oxygen contents.
- anode of the instant invention is characterised by reduced electric energy consumption per tonne of product chlorine.
- the invention concerns an electrode structure for electrolysis cell divided by a separator into an anodic compartment and a cathodic compartment, comprising at least one movable surface suited to be put in contact with the separator and provided with a thicker component and a thinner component overlapped thereto, the thicker component being generally planar and the thinner component being a thin sheet provided with openings or a thin mesh of wires.
- the electrode structure of the invention is characterised in that only the thicker component is provided with a catalytic coating. Contrary to prior art, only the underlying thicker component is catalyst-coated while thinner component, i.e. the outermost component directly facing the separator, remains uncoated.
- the invention also concerns a chlor-alkali membrane or diaphragm cell comprising at least one electrode structure of the invention.
- the invention concerns a chlor-alkali electrolysis process carried out in the such a cell, the process being characterised by having a voltage not higher than 3
- figure 1a three-dimensional view of anode in accordance with the invention with each of the two major movable surfaces consisting of a component of higher thickness and substantially planar development resulting from a multiplicity of horizontal plates slanted with respect the vertical plane and by a further thin porous layer, for instance in form of perforated sheet, expanded sheet, mesh of wires, layer of sintered material, applied on the outer edge of the multiplicity of plates.
- - figure 1 b side-view of section along line X-X of figure 1 a.
- figure 1 c top-view of section along line Y-Y of figure 1 a.
- figure 1d three-dimensional view of the current collecting stem alone, provided with expanders.
- figure 2a front-view of a particular embodiment of the plate structure of figure 1a.
- figure 2b side-view of section along line W-W of figure 2a
- figure 3a three-dimensional view of anode in accordance with the invention with each of the two major movable surfaces consisting of a component of higher thickness and substantially planar development resulting from a multiplicity of vertical plates and by a further thin porous layer, for instance in form of perforated sheet, expanded sheet, mesh of wires, layer of sintered material, applied on the outer edge of the multiplicity of plates.
- figure 3b side-view of section along line K-K of figure 3a.
- figure 3c top-view of section along line Z-Z of figure 3a.
- figure 4a three-dimensional view of a further embodiment of the anode of the invention with each of the two major movable surfaces consisting of a thicker porous sheet, for instance a perforated sheet, expanded sheet, mesh of wires, layer of sintered material, with a second thin porous sheet applied thereto, also in form of perforated sheet, expanded sheet, mesh of wires, layer of sintered material.
- figure 4b side-view of section along line S-S of figure 4a.
- figure 4c top-view of section along line T-T of figure 4a.
- the first type of structure is represented in a three-dimensional view in figure 1a, wherein (1) indicates the current collecting stem consisting of a core of highly conductive metal such as copper provided with an external layer of corrosion resistant metal such as titanium, niobium, tantalum, (2) the foot of the stem provided with a threaded portion to allow the fixing on the supporting anodic sheet (not represented), (3) the expanders consisting of elastic elements which allow to maintain the two major surfaces in a restrained position, that is adherent to the current collecting stem, during the cell assemblage and to bring them to an expanded position, that is apart from the current collecting stem and in direct contact with the diaphragm surface (not shown) during operation as known to the experts of the field, (4) the multiplicity of parallel horizontal plates which are secured to supporting bars (6) secured in their turn to the edges of the expanders forming one of the two major surfaces, the other surface being schematised by the contour (10), (5) the thin porous layer consisting of an expanded flattened sheet fixed, for instance by welding, to the edges of the
- FIG. 1d the current collecting stem (1 ) provided with terminal part (2) and expanders (3) without their major surfaces is represented in three dimensions.
- the anode of figure 1a is preferably provided with the additional expanding elements disclosed in US 5,534,122.
- FIGS 2a and 2b it is shown a particular embodiment of the multiplicity of plates of figure 1a, respectively as a front-view and as a side-view of the section along line W-W.
- the horizontal plates are obtained by making cuts of suitable length in parallel and off-set horizontal rows on a sheet (7), and by subsequently deforming the sheet in correspondence of the cuts in order to form the multiplicity of plates known as "louver geometry".
- the advantage of this structure is given by the very quick fabrication procedure which does not require the assembling of separate plates.
- On the sheet provided with openings it is secured the expanded flattened thin sheet (5), as already seen for the anode of figure 1a.
- the assembly of sheet (7) and thin sheet (5) is in its turn fixed to the expanders (not represented) as seen in the case of the anode of figure 1a.
- Figure 3d reproduces a three-dimensional view of an embodiment of anodic structure, wherein (1 ) indicates as already seen the current collecting stem provided with threaded foot (2) for the fixing to the anodic supporting sheet (not represented), (3) the expanders, (8) a multiplicity of vertical plates supported by the horizontal bars (9), secured to the supporting bars (6), in their turn fixed to the expanders (3); once again, the other major surface is schematised by the contour (10).
- the multiplicity of vertical plates (8) finally supports the expanded flattened thin sheet (5).
- Figures 3b and 3c respectively show a side-view and a top-view of the two sections of figure 3a along the lines K-K and Z-Z.
- figure 4a reports a three-dimensional view of a further embodiment of anodic structure wherein the common parts to the previous embodiments are indicated with the same identifying numerals: the component of higher thickness consists of a sheet provided with openings (11) secured, for instance by welding, to the above seen thin sheet (5).
- Figures 4b and 4c respectively show a side-view and a top-view of the two sections of figure 4a along the lines S-S and T-T.
- the above disclosed anode structures were installed in lab diaphragm cells having an active area of 13 centimetre width and 100 centimetre length, equipped with the diaphragms based on asbestos fibre stabilised by polytetrafluoroethylene as binder deposited on a cathode consisting of a mesh of carbon steel wires disclosed in the examples of US 5,534,122.
- the cells were operated at a current density of 2500 A/m 2 , at 90-95°C, with a purified brine feed containing 315 g/l of sodium chloride and 0.5 mg/l of calcium + magnesium and with an outlet electrolyte containing about 125 g/l of caustic soda and about 190 g/l of residual sodium chloride.
- the anodic structures employed had the following geometrical features: - Type A: horizontal plates of the type shown in figure 2a, obtained by making cuts 15 millimetre long on a 1 millimetre thick sheet, in parallel and off-set horizontal rows spaced apart by 2.5 millimetres and then deforming the thus pre- cut sheet in correspondence of each of the cuts, so as to form a multiplicity of plates according to the geometry known as "louvered", with the plates slanted by 30° with respect to the vertical plan. Thin sheet obtained from 0.5 millimetre thick sheet, expanded and flattened with formation of rhomboidal openings having diagonals of 3 and 5 millimetres.
- Type B vertical plates of the type shown in figure 3a, 4 millimetre wide, 1 millimetre thick, spaced apart by 4 millimetres.
- Type C used as reference structure, consisting, in accordance with the disclosure of US 5,534,122, of the overlap of a thin sheet equivalent to the one employed for types A and B on a sheet obtained by expansion without flattening of a 1 millimetre thick sheet with rhomboidal openings having diagonals respectively of 10 and 15 millimetres (figure 4a).
- the catalytic coating employed based on the formulation commonly used for diaphragm chlor-alkali cell anodes and consisting of a mixture of ruthenium and titanium oxides, was applied only to the thin sheet (anodes A1 , B1), to both the thin sheet and the plates (anodes A2, B2), to the plates alone (anodes A3 e B3).
- the coating was applied at least to the thin sheet (C1) or to both sheets, the thin and the thicker one (C2). The results obtained can be summarised as follows: - anode A1.
- Cell voltage 2.8 Volts constantly rising up to 3.1 Volts in the first 200 ore of operation, with no further variation until disassembling the cell (770 hours), oxygen content in chlorine: about 3.3%, with fluctuations of small entity. - anode B2.
- a further negative factor is probably represented by disuniformity in the distribution of current, which tends to concentrate inside the diaphragm in correspondence of the meshes of the thin sheet when they are in contact with the diaphragm or even partially penetrating inside it.
- the behaviour of anodes of types A2 and B2 would finally coincide with the one of anodes A3 and B3 wherein the catalytic coating is applied on the plates alone.
- the higher oxygen content in chlorine characteristic of all the anodes A1 , A2, B1 , B2 may perhaps be explained by remembering that a certain portion of caustic soda migrates back toward the anodic compartment establishing a generally alkaline pH profile within the diaphragm, probably capable of extending also to the brine film adhering to the surface of the same diaphragm.
- the thin sheet provided with catalytic coating and kept in contact with the diaphragms by the expanding devices is practically in direct contact with alkaline brine: it follows a facilitated oxygen evolution up to the relatively high levels recorded during the test. The oxygen evolution is further enhanced if the thin sheet penetrates albeit partially inside the diaphragm surface.
- the thin sheet, or equivalent structure such as for example a mesh of wires of the same thickness, is free of catalytic coating which is only applied to the plates where the alkalinity cannot arrive being dispersed by the local turbulence.
- the oxygen content in chlorine assumes a particular importance since it directly influences the oxygen consumption per tonne of product chlorine.
- the anodes in accordance with the present invention consisting of a thin porous layer, such as for instance a sheet provided with openings and flattened, coupled to a porous component of higher thickness capable of promoting the local recirculation of brine, such as for instance a multiplicity of horizontal or vertical plates, with the catalytic coating only applied to such component, achieve in a satisfactory manner the objectives initially put forward of low cell voltage, low oxygen content in chlorine, contact with negligible risks of mechanical damaging with the diaphragms of chlor-alkali cells.
- the thin sheet or equivalent structure may be made of metal or polymer, preferably hydrophilised to prevent the adhesion of gas bubbles.
- the thin sheet or equivalent structure may have a thickness comprised between 0.1 and 1 millimetres, preferably between 0.3 and 0.5 millimetres.
- the thin sheet may have a ratio between opening clearance and surface occupied by the construction material of at least 50%, preferably of at least 70%, even more preferably of at least 90%. High values of the ratio permit avoiding that local concentrations of current be created with an undue ohmic drop increase.
- Typical sizes are: width of construction material portions 0.2- 0.8 millimetres, for instance 0.5 millimetres, rhomboidal openings with major and minor diagonal respectively 1 to 5 and 3 to 7 millimetre long, for instance 3 and 5 millimetres.
- the thin sheet may be disposed directly on the diaphragms instead of being fixed to the anodic structure. In this case the pressure exerted by the anodic structure under the push of the expanding devices determines the intimate contact between the structure itself and the thin sheet, required for the functioning of the anode of the invention.
- the structures directed to promote the local recirculation of brine preferably consist of horizontal or vertical plates whose thickness, spacing and width must be optimised according to the operating conditions, in particular the current density employed, and to the diaphragm type.
- structures consisting of low thickness and low spacing plates result favourable.
- the minimum thicknesses should be around 0.3 millimetres, and the minimum spacing around 1 millimetre, while the width is limited by the admissible width of the anode, which although in a restrained position must be easily insertable between the cell cathode fingers.
- structures comprising 15 millimetre horizontal plates obtained by deformation of a 1 millimetre thick sheet have been disclosed, but different widths, for instance comprised between 5 and 30 millimetres for plates obtained from sheets of thickness comprised between 0.3 and 2 millimetres can be likewise employed. It has been also disclosed an optimum spacing of 2.5 millimetres, but values comprised between 1 and 5 millimetres also allow to practise the invention advantageously.
- structure with vertical plates 1 millimetre thick plates, with width and spacing of 4 millimetres were disclosed, but thicknesses from 0.3 to 2 millimetres for plates of width and spacing comprised between 2 and 10 millimetres could also be employed.
- anode With the industrial size anodes of about 0.7-1 m 2 per side it is probably difficult to exert a uniform pressure on the diaphragms whose surfaces may present planarity defects. To obviate this problem the anode is advantageously subdivided into separate sections, each secured to the expanders: the elasticity of the expanders allows a little tilt which facilitates a more uniform contact, and therefore an improved repartition of the compression, even with diaphragm characterised by sensible irregularities of planarity.
- the present invention is not only relative to only newly constructed anodes, since the structure preferably consisting of the vertical or horizontal plate panels can be easily installed also on previously used anodes: the relevant procedure provides the detachment of the old expanded sheet whose catalytic coating is exhausted, the cleaning of the terminal parts of the expanders from residues of previous welds, the construction of the panels consisting of plates secured to supporting bars and provided with catalytic coating, the welding of the panels to the terminal parts of the expanders, with a final step represented for instance by the welding in case the thin sheet is made out of metal.
- An entirely equivalent procedure is followed when the newly constructed anodes have lost their catalytic activity after a prolonged operation.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Electrodes For Compound Or Non-Metal Manufacture (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MXPA05013846A MXPA05013846A (en) | 2003-06-24 | 2004-06-23 | Expandable anode for diaphragm cells. |
BRPI0411886-3A BRPI0411886A (en) | 2003-06-24 | 2004-06-23 | expandable anode for diaphragm cells |
EP04740211A EP1641962A1 (en) | 2003-06-24 | 2004-06-23 | Expandable anode for diaphragm cells |
US10/561,777 US20060163081A1 (en) | 2003-06-24 | 2004-06-23 | Expandable anode for diaphragm cells |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI2003A001269 | 2003-06-24 | ||
IT001269A ITMI20031269A1 (en) | 2003-06-24 | 2003-06-24 | NEW EXPANDABLE ANODE FOR DIAPHRAGM CELLS. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005001163A1 true WO2005001163A1 (en) | 2005-01-06 |
Family
ID=30131271
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/006791 WO2005001163A1 (en) | 2003-06-24 | 2004-06-23 | Expandable anode for diaphragm cells |
Country Status (8)
Country | Link |
---|---|
US (1) | US20060163081A1 (en) |
EP (1) | EP1641962A1 (en) |
CN (1) | CN1813082A (en) |
BR (1) | BRPI0411886A (en) |
IT (1) | ITMI20031269A1 (en) |
MX (1) | MXPA05013846A (en) |
RU (1) | RU2006101869A (en) |
WO (1) | WO2005001163A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006079545A1 (en) * | 2005-01-27 | 2006-08-03 | Industrie De Nora S.P.A. | Anode for gas evolution reactions |
JP2010504049A (en) * | 2006-09-15 | 2010-02-04 | クゥアルコム・インコーポレイテッド | Method and apparatus related to interference management and / or power control in a mixed wireless communication system |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102051632B (en) * | 2009-10-28 | 2012-08-22 | 中国石油化工股份有限公司 | Method for free-state assembly of expanded anode of diaphragm electrolytic cell |
DE102010021833A1 (en) * | 2010-05-28 | 2011-12-01 | Uhde Gmbh | Electrode for electrolysis cell |
CN103088361A (en) * | 2012-12-13 | 2013-05-08 | 苏州新区化工节能设备厂 | Expanded anode arranged in electrolytic cell |
CN108728891B (en) * | 2018-09-03 | 2023-12-26 | 宝鸡市创信金属材料有限公司 | Cross grafting netted titanium electrode positive pole |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3674676A (en) * | 1970-02-26 | 1972-07-04 | Diamond Shamrock Corp | Expandable electrodes |
US4469577A (en) * | 1982-05-26 | 1984-09-04 | Uhde Gmbh | Membrane electrolysis cell |
US4617101A (en) * | 1980-11-15 | 1986-10-14 | Asahi Glass Company Ltd. | Alkali metal chloride electrolyzing cell |
EP0203224A1 (en) * | 1985-05-30 | 1986-12-03 | Heraeus Elektroden GmbH | Electrode structure for electrochemical cells |
US4695355A (en) * | 1985-05-31 | 1987-09-22 | Conradty Gmbh & Co. Metallelektroden Kg | Electrode for membrane electrolysis |
US5534122A (en) * | 1993-02-12 | 1996-07-09 | De Nora Permelec S.P.A. | Cell having a porous diaphragm for chlor-alkali electrolysis and process using the same |
EP1038993A1 (en) * | 1997-12-10 | 2000-09-27 | Shinko Plant Construction Co., Ltd. | Apparatus for producing ozone water and method of producing ozone water by using the same apparatus |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1118243B (en) * | 1978-07-27 | 1986-02-24 | Elche Ltd | MONOPOLAR ELECTROLYSIS CELL |
DE3808495A1 (en) * | 1988-03-15 | 1989-09-28 | Metallgesellschaft Ag | MEMBRANE ELECTROLYSIS DEVICE |
US5100525A (en) * | 1990-07-25 | 1992-03-31 | Eltech Systems Corporation | Spring supported anode |
DE4419091A1 (en) * | 1994-06-01 | 1995-12-07 | Heraeus Elektrochemie Bitterfe | Electrode structure for a monopolar electrolysis cell using the diaphragm or membrane cell method |
US5783050A (en) * | 1995-05-04 | 1998-07-21 | Eltech Systems Corporation | Electrode for electrochemical cell |
IT1291525B1 (en) * | 1997-04-10 | 1999-01-11 | De Nora Spa | DIAPHRAGM ELECTROCHEMISTRY ANODE |
-
2003
- 2003-06-24 IT IT001269A patent/ITMI20031269A1/en unknown
-
2004
- 2004-06-23 CN CNA2004800176821A patent/CN1813082A/en active Pending
- 2004-06-23 US US10/561,777 patent/US20060163081A1/en not_active Abandoned
- 2004-06-23 RU RU2006101869/15A patent/RU2006101869A/en not_active Application Discontinuation
- 2004-06-23 BR BRPI0411886-3A patent/BRPI0411886A/en not_active Application Discontinuation
- 2004-06-23 MX MXPA05013846A patent/MXPA05013846A/en unknown
- 2004-06-23 EP EP04740211A patent/EP1641962A1/en not_active Withdrawn
- 2004-06-23 WO PCT/EP2004/006791 patent/WO2005001163A1/en not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3674676A (en) * | 1970-02-26 | 1972-07-04 | Diamond Shamrock Corp | Expandable electrodes |
US4617101A (en) * | 1980-11-15 | 1986-10-14 | Asahi Glass Company Ltd. | Alkali metal chloride electrolyzing cell |
US4469577A (en) * | 1982-05-26 | 1984-09-04 | Uhde Gmbh | Membrane electrolysis cell |
EP0203224A1 (en) * | 1985-05-30 | 1986-12-03 | Heraeus Elektroden GmbH | Electrode structure for electrochemical cells |
US4695355A (en) * | 1985-05-31 | 1987-09-22 | Conradty Gmbh & Co. Metallelektroden Kg | Electrode for membrane electrolysis |
US5534122A (en) * | 1993-02-12 | 1996-07-09 | De Nora Permelec S.P.A. | Cell having a porous diaphragm for chlor-alkali electrolysis and process using the same |
EP1038993A1 (en) * | 1997-12-10 | 2000-09-27 | Shinko Plant Construction Co., Ltd. | Apparatus for producing ozone water and method of producing ozone water by using the same apparatus |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006079545A1 (en) * | 2005-01-27 | 2006-08-03 | Industrie De Nora S.P.A. | Anode for gas evolution reactions |
US7704355B2 (en) | 2005-01-27 | 2010-04-27 | Industrie De Nora S.P.A. | Anode for gas evolution reactions |
JP2010504049A (en) * | 2006-09-15 | 2010-02-04 | クゥアルコム・インコーポレイテッド | Method and apparatus related to interference management and / or power control in a mixed wireless communication system |
Also Published As
Publication number | Publication date |
---|---|
EP1641962A1 (en) | 2006-04-05 |
CN1813082A (en) | 2006-08-02 |
US20060163081A1 (en) | 2006-07-27 |
ITMI20031269A1 (en) | 2004-12-25 |
BRPI0411886A (en) | 2006-08-29 |
ITMI20031269A0 (en) | 2003-06-24 |
RU2006101869A (en) | 2006-06-10 |
MXPA05013846A (en) | 2006-03-13 |
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