EP0685575B1 - Electrode pour cellules d'électrolyse - Google Patents

Electrode pour cellules d'électrolyse Download PDF

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Publication number
EP0685575B1
EP0685575B1 EP95100928A EP95100928A EP0685575B1 EP 0685575 B1 EP0685575 B1 EP 0685575B1 EP 95100928 A EP95100928 A EP 95100928A EP 95100928 A EP95100928 A EP 95100928A EP 0685575 B1 EP0685575 B1 EP 0685575B1
Authority
EP
European Patent Office
Prior art keywords
electrode
electrode parts
activated
edge
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
EP95100928A
Other languages
German (de)
English (en)
Other versions
EP0685575A1 (fr
Inventor
Bernd Dr. Busse
Robert Dr. Scannel
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Heraeus Elektrochemie GmbH filed Critical Heraeus Elektrochemie GmbH
Publication of EP0685575A1 publication Critical patent/EP0685575A1/fr
Application granted granted Critical
Publication of EP0685575B1 publication Critical patent/EP0685575B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • the invention relates to an electrode for electrolytic cells, in particular for mercury-chlor-alkali electrolytic cells.
  • the activated electrode parts arranged on their lower edge with perpendicular to them made of upright flat profiles with vertical or almost vertical outer sides are connected by welding, the activated electrode parts from a larger one
  • the current distributors and the activated electrode parts with a gap of at least 2 mm to each other.
  • GB-A-10 68 992 describes an anode arrangement for chlor-alkali electrolysis in which the underside of power distributors is provided with electrode parts made of titanium sheet profiles, the have wedge-shaped tapered lower edges around a gas bubble discharge from the anode area to improve.
  • an electrode for mercury-chlor-alkali electrolysis cells known with power supplies via rods or power supply bolts, which has spaced-apart flat profiles that are perpendicular to their lower edge is connected to them arranged activated electrode parts, the activated electrode parts consist of a larger number of individual elements than the electrical parts and the Individual elements seen in cross section has a tapering lower edge, which is essentially is formed exhaust gas; proves to be problematic in such circular or semicircular configurations the removal of the gas bubbles generated during electrolysis, since this on the one hand the ion exchange in the electrolytic gap between the semicircular profiles and hinder the mercury cathode, on the other hand, have no rapid withdrawal option, so that a kind of gas bubble cushion can be expected in the lower area of the profile anode got to; furthermore, the height of the activation coating on the electrodes is proportional high, so that the areas with precious metals are relatively far removed from the electrode gap Substances are provided, but practically no electrochemicals Contribute implementation.
  • the object of the invention is so the electrodes or anodes for the chlor-alkali electrolysis cell to design that the gas extraction from the area of the electrode gap is promoted and an interface between the anode and the electrolyte in the area of the electrode gap that is as free as possible from gas bubbles is available;
  • a high energy utilization in Electrolysis can be achieved by low electrode voltage.
  • the triangle or wedge-shaped element of the Bottom edge an angle in the range of 30 to 90 °, in particular in the range of approx. 60 ° a particularly rapid gas extraction of the electrolytic reaction can take place. More beneficial Refinements are specified in the subclaims.
  • the thickness is preferably of the activated electrode parts in the range from 1.5 to 2.5 mm.
  • FIG. 1 shows an electrode, the upper part of the cross section of which tapers upwards is, while the lower part is tapered downwards.
  • Figure 2 shows schematically an electrode with electrode elements according to Figure 1, the two upper current conductor levels are recognizable.
  • FIG. 1 shows schematically the use of the electrodes 1,2 according to the invention with a base angle Alpha in the area of the lower edge 3 of 60 °, whereby due to the Bottom edge 3 isosceles extending partial triangle 4 by means of the electrocatalytic applied Layer 5 rapid electrolytic conversion and rapid removal any gas bubbles that may occur by means of a gap 6 between two adjacent electrodes 1,2 resulting chimney effect.
  • the gas bubbles are symbolic here with reference numerals 7 provided.
  • the electrodes 1, 2 with the current distributors 17 of the second are on their upper side 14 Layer connected, which are shown here only broken for a better overview.
  • FIG. 2 shows schematically the electrode according to the invention with its three current collector levels of which the two upper levels are formed from rectangular flat profiles 17, 18, which stand upright on top of each other and are perpendicular to each other so that none Obstruction of the gas flow from the area of the electrode gap 6 can occur; on the lower edges of the current distributors 17 of the second level are the electrode elements 1, 2 fixed by welding at an angle of 90 ° so that the gas discharge of the resulting Gas bubbles are not hindered.
  • the electrode structure of the two upper levels and the power supply line is referred to U.S. Patent 4,364,811.

Landscapes

  • 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)

Claims (3)

  1. Électrode pour cellules d'électrolyse, en particulier pour des cellules d'électrolyse mercure-chlorure alcalin, avec des amenées de courant par des tiges ou des broches d'amenée du courant et des répartiteurs de courant sous forme de profilés plats qui sont disposés sur chant, à une certaine distance l'un de l'autre, et qui sont reliés, par soudage, à leur face inférieure, avec des pièces formant électrodes activées, disposées perpendiculairement aux répartiteurs et constituées de profilés plats sur chant à faces extérieures verticales ou approximativement verticales, les pièces formant électrodes activées étant constituées d'un plus grand nombre d'éléments individuels que les répartiteurs de courant et les pièces formant électrodes activées étant disposées avec un intervalle d'au moins 2mm entre elles, caractérisée par le fait que les pièces formant électrodes activées (1, 2) présentent, vu en coupe, des faces inférieures qui vont en diminuant en forme de coin/en forme de prisme et présentent, vu en coupe du profil, une partie inférieure triangulaire maintenue par une partie supérieure qui va en diminuant vers le haut.
  2. Électrode selon la revendication 1, caractérisée par le fait que la face inférieure en forme en de coin est formée de deux plans qui s'intersectent sous un angle valant de 40 à 100°.
  3. Électrode selon la revendication 1 ou 2, caractérisée par le fait que les pièces formant électrodes (1, 2) du troisième plan sont disposées à une distance valant de 1,5 à 3mm l'une de l'autre et orientées parallèlement l'une à l'autre.
EP95100928A 1994-06-01 1995-01-25 Electrode pour cellules d'électrolyse Expired - Lifetime EP0685575B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4419277 1994-06-01
DE4419277A DE4419277C2 (de) 1994-06-01 1994-06-01 Elektrolysezellen-Elektrode

Publications (2)

Publication Number Publication Date
EP0685575A1 EP0685575A1 (fr) 1995-12-06
EP0685575B1 true EP0685575B1 (fr) 1999-05-06

Family

ID=6519607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95100928A Expired - Lifetime EP0685575B1 (fr) 1994-06-01 1995-01-25 Electrode pour cellules d'électrolyse

Country Status (2)

Country Link
EP (1) EP0685575B1 (fr)
DE (2) DE4419277C2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2357717C (fr) * 1999-01-08 2005-12-06 Moltech Invent S.A. Cellules d'extraction electrolytique de l'aluminium pourvues d'anodes a emission d'oxygene

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1068992A (en) * 1964-03-31 1967-05-17 Asahi Chemical Ind Anode assembly
US3507771A (en) * 1966-09-30 1970-04-21 Hoechst Ag Metal anode for electrolytic cells
US4022679A (en) * 1973-05-10 1977-05-10 C. Conradty Coated titanium anode for amalgam heavy duty cells
DE2949495C2 (de) * 1979-12-08 1983-05-11 Heraeus-Elektroden Gmbh, 6450 Hanau Elektrode für Elektrolysezellen
DE3008116A1 (de) * 1980-03-03 1981-09-17 Conradty GmbH & Co Metallelektroden KG, 8505 Röthenbach Gasentwickelnde metallelektrode fuer elektrochemische prozesse
DE3345530A1 (de) * 1983-07-13 1985-06-27 Basf Ag, 6700 Ludwigshafen Gasentwickelnde metallelektrode fuer elektrolysezellen

Also Published As

Publication number Publication date
DE4419277A1 (de) 1995-12-07
EP0685575A1 (fr) 1995-12-06
DE4419277C2 (de) 1998-07-02
DE59505815D1 (de) 1999-06-10

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