EP0685576B1 - Electrode pour cellule d'électrolyse - Google Patents

Electrode pour cellule d'électrolyse Download PDF

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Publication number
EP0685576B1
EP0685576B1 EP95102062A EP95102062A EP0685576B1 EP 0685576 B1 EP0685576 B1 EP 0685576B1 EP 95102062 A EP95102062 A EP 95102062A EP 95102062 A EP95102062 A EP 95102062A EP 0685576 B1 EP0685576 B1 EP 0685576B1
Authority
EP
European Patent Office
Prior art keywords
recesses
electrode
electrode according
constructed
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95102062A
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German (de)
English (en)
Other versions
EP0685576A1 (fr
Inventor
Robert Dr. Scannell
Bernd Dr. Busse
Helmut Vormwald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
De Nora Deutschland GmbH
Original Assignee
Heraeus Elektrochemie GmbH
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Filing date
Publication date
Application filed by Heraeus Elektrochemie GmbH filed Critical Heraeus Elektrochemie GmbH
Publication of EP0685576A1 publication Critical patent/EP0685576A1/fr
Application granted granted Critical
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    • 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

  • the invention relates to an electrode for electrolytic cells, in particular for mercury-chlor-alkali electrolytic cells with current leads via rods or current lead bolts and current distributors in the form of upright standing, spaced-apart flat profiles, the activated electrode parts of up to 2 of which are arranged on their lower edge with perpendicular to them mm thick, upright flat profiles are connected to vertical outer sides by welding, the activated electrode parts consisting of a larger number of individual elements than the current distributors, and the activated electrode parts being arranged with a gap of at least 2 mm to one another.
  • the problem of electrochemical conversion also plays an important role in membrane electrolysis cells, as can be seen from EP-PS 204 126;
  • the electrode parts adjacent to the membrane have recesses which enable improved electrochemical conversion due to the surface enlargement of the active electrode area and the gas removal.
  • the object of the invention is to design the electrodes or anodes for the chlor-alkali electrolysis cell in such a way that the gas removal is promoted from the area of the electrode gap and an interface between the anode and electrolyte in the area of the electrode gap which is as gas-free as possible is available; in addition, high energy utilization in electrolysis is to be achieved by means of low electrode voltage.
  • the recesses are U-shaped when viewed from above in cross section, with recesses in the form of a hollow cuboid in particular resulting in a large increase in the active surface area in the region of the side parts, so that there is rapid electrochemical conversion with improved efficiency.
  • Electrode elements are preferably used, the U-shaped recesses of which are made in the rolling process; An essential advantage is to be seen in the inexpensive method for producing a large number of such electrode elements, the rolled strand initially provided with recesses being broken down into the individual electrode elements by a cutting process. However, it is also possible to make the recesses by milling.
  • the electrode 1 consists of a plurality of rod-shaped electrode elements 2, which are provided on their side surfaces with recesses 3, and on their upper edge 4 are connected to current distributors 5 in the form of flat profiles by welding; on their lower edge, or in the area of their lateral surfaces 6, the electrode elements 2 have an electrocatalytic coating, which is symbolically provided with reference number 7.
  • the upper edges 8 of the rectangular profiles serving as current distributors 5 are connected to a main current distributor 9, which has a connection opening 10 for electrical and mechanical connection to a current supply bolt, not shown here; it is a so-called three-level electrode, which is known from DE-PS 29 49 495 and US-PS 43 64811. Since the side surfaces 11 are substantially larger than the base surfaces 12 of the recess, an enlarged outer surface surface of the electrode element 2 is available for the electrochemical conversion.
  • the ratio of base area to is in the range of 1: 1.5 to 1: 3, preferably 1: 2.
  • the rod-shaped electrode element 2 shown in detail has recesses 3 on its two side surfaces, which alternate with bulges 13 in a meandering manner, so that, seen in the cross section of the electrode element 2, a recess 3 is opposite a bulge 13; the ratio of the width of the recess b to the height of the recess h is in the range from 1: 2 to 1: 2.5, so that the total size of the side surfaces 11 that is available for the electrochemical conversion is significantly larger than the omitted base surfaces 12 the recess in the area of the surface of the lower edge 14 and upper edge 4 of the electrode element.
  • the electrocatalytic coating 7 is applied in the entire region of the lower edge 14, or the base surface facing the mercury, in the region of the lateral surfaces 6 of the bulges 13, the side surfaces 11 and the recess surfaces 15, it being additionally possible for the upper edge 4 of the electrode element to be included to provide electrocatalytic coating; however, it is also possible to apply the electrocatalytic coating only in the lower region of the lateral surfaces 6, side surfaces 11, bulges 13 and recesses 15 and the bottom surface in the region of the lower edge.
  • FIG. 2b shows sections of two adjacent electrode elements 2, between which a meandering electrode gap 17 is formed; Due to the meandering structure, there is not only an increase in the surface area of the active surface, but also a channeling effect for those that arise during the electrochemical reaction Gas bubbles so that a swirling of the gas bubbles within the electrolyte is largely avoided and a rapid removal of the gas bubbles is made possible.
  • the ratio of the depth t of the recesses 3 to the gap width s between the electrode elements 2 is in the range from 1: 2 to 1: 2.5.
  • the ratio of the depth u of the recess in the region of the lower edge 14 to the depth of the recess v in the region of the upper edge 4 of the recess in a ratio of 1: 1 , 8 to 2 lies.
  • the angle of inclination of the recess surface 15 to the vertical is in the range from 10 to 22 °, in a preferred embodiment approximately 15 °.
  • FIG. 4 shows a section of a rod-shaped electrode element 2 which has hollow cylindrical recesses 3, the recesses 3 and bulges 13 being arranged in a meandering manner, so that the respective recess 3 is opposite a bulge 13 at its lowest point.
  • the actual recesses 13 form hollow cylindrical segments, the secants 20 of which are predetermined by the upper edge 4 and lower edge 14 of the electrode elements.
  • the ratio of the secant length to the fictitious radius of the hollow cylinder is in the range of 1.6: 1.2.
  • FIG. 5 shows a detail of a rod-shaped electrode element 2, the recesses 3 of which are formed in the form of hollow cone segments, the recess surface 15 formed by a truncated cone in the region adjacent to the bulge 13 according to the cross section along line AB with the vertical having an angle in the range from 10 to 22 °, preferably forms 16 °.
  • an additional chimney effect to collect the gas bubbles in the lower region of the electrode and an accelerated removal of the gas bubbles instead.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Claims (8)

  1. Electrode pour cellules d'électrolyse, en particulier pour des cellules d'électrolyse au mercure-chlore-alcali, comprenant des amenées de courant utilisant des barres ou des vis d'amenée du courant et des distributeurs de courant présentant la forme de profilés plats montés sur chant, disposés à écartement les uns des autres qui sont assemblés, au niveau de leur chant inférieur, à des éléments d'électrodes activés disposés perpendiculairement à ces profilés et faits de profilés plats disposés sur chant, et possédant des faces extérieures verticales, les parties d'électrodes activées étant constituées par des éléments individuels en nombre supérieur à celui des distributeurs de courant et les parties d'électrodes activées étant espacées les unes des autres par une fente d'au moins 2 mm, caractérisée en ce que les éléments d'électrodes (2) présentent, dans la région de leurs surfaces latérales (6), des évidements (3) qui s'étendent du chant inférieur (14) jusqu'au chant supérieur (4) des surfaces latérales.
  2. Electrode selon la revendication 1, caractérisée en ce que les évidements (3) sont conformés en section transversale avec une forme courbe, en vue de dessus.
  3. Electrode selon la revendication 1 ou 2, caractérisée en ce que les évidements (3) sont disposés avec une forme sinueuse, de sorte que, en vue de dessus, un évidement et une protubérance (13) située entre deux évidements (3) sont disposés l'un à l'opposé de l'autre.
  4. Electrode selon une des revendications 1 à 3, caractérisée en ce que les évidements (3) ont la forme d'une partie d'un parallélépipède creux.
  5. Electrode selon une des revendications 1 à 3, caractérisée en ce que les évidements (3) ont la forme d'une partie d'un cylindre creux.
  6. Electrode selon une des revendications 1 à 3, caractérisée en ce que les évidements (3) ont la forme d'une partie d'un cône creux.
  7. Electrode selon une des revendications 1 à 5, caractérisée en ce que les évidements (3) sont fraisés.
  8. Electrode selon une des revendications 1 à 5, caractérisée en ce que les évidements (3) sont formés par laminage.
EP95102062A 1994-06-01 1995-02-15 Electrode pour cellule d'électrolyse Expired - Lifetime EP0685576B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4419274 1994-06-01
DE4419274A DE4419274A1 (de) 1994-06-01 1994-06-01 Elektrode für Elektrolysezellen

Publications (2)

Publication Number Publication Date
EP0685576A1 EP0685576A1 (fr) 1995-12-06
EP0685576B1 true EP0685576B1 (fr) 1997-04-16

Family

ID=6519605

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95102062A Expired - Lifetime EP0685576B1 (fr) 1994-06-01 1995-02-15 Electrode pour cellule d'électrolyse

Country Status (4)

Country Link
US (1) US5589044A (fr)
EP (1) EP0685576B1 (fr)
DE (2) DE4419274A1 (fr)
ES (1) ES2100750T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5849164A (en) * 1996-06-27 1998-12-15 Eltech Systems Corporation Cell with blade electrodes and recirculation chamber
EP1416067A3 (fr) * 1999-01-08 2004-07-21 MOLTECH Invent S.A. Cuve de production électrolytique d'aluminium à anodes à dégagement d'oxygène
DE10013297B4 (de) * 2000-03-17 2005-06-30 Vlm Gmbh Befestigungsvorrichtung zur Befestigung des Trägers eines Leuchtenkopfes an einem Tragrohr
US8771497B2 (en) * 2007-04-20 2014-07-08 Mitsui Chemicals, Inc. Electrolyzer, electrodes used therefor, and electrolysis method
WO2022109420A1 (fr) * 2020-11-23 2022-05-27 Lawrence Livermore National Security, Llc Électrodes ondulées pour applications électrochimiques
CN113355689B (zh) * 2021-05-07 2023-03-31 北京蕴超仿生智能科技发展有限公司 一种亲气疏气协同限域电极及其制备方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022679A (en) * 1973-05-10 1977-05-10 C. Conradty Coated titanium anode for amalgam heavy duty cells
US3929607A (en) * 1974-02-25 1975-12-30 Ici Ltd Anodes for electrochemical processes
DE2949495C2 (de) * 1979-12-08 1983-05-11 Heraeus-Elektroden Gmbh, 6450 Hanau Elektrode für Elektrolysezellen
GB8407871D0 (en) * 1984-03-27 1984-05-02 Ici Plc Electrode and electrolytic cell
DE3519573A1 (de) * 1985-05-31 1986-12-04 Conradty GmbH & Co Metallelektroden KG, 8505 Röthenbach Elektrode fuer die membran-elektrolyse

Also Published As

Publication number Publication date
EP0685576A1 (fr) 1995-12-06
ES2100750T3 (es) 1997-06-16
DE4419274A1 (de) 1995-12-07
US5589044A (en) 1996-12-31
DE59500185D1 (de) 1997-05-22

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