EP0951584A1 - Wall-covering for electrolytic cells - Google Patents

Wall-covering for electrolytic cells

Info

Publication number
EP0951584A1
EP0951584A1 EP98901940A EP98901940A EP0951584A1 EP 0951584 A1 EP0951584 A1 EP 0951584A1 EP 98901940 A EP98901940 A EP 98901940A EP 98901940 A EP98901940 A EP 98901940A EP 0951584 A1 EP0951584 A1 EP 0951584A1
Authority
EP
European Patent Office
Prior art keywords
side wall
support structure
cladding
covering
wall according
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.)
Granted
Application number
EP98901940A
Other languages
German (de)
French (fr)
Other versions
EP0951584B1 (en
Inventor
Peter Clasen
Stefan Venghaus
Horst Dykrzak
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.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Publication of EP0951584A1 publication Critical patent/EP0951584A1/en
Application granted granted Critical
Publication of EP0951584B1 publication Critical patent/EP0951584B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features

Definitions

  • the invention relates to a corrosion-protecting wall cladding of side walls in apparatus for receiving chlorine-containing process gases, in particular in electrolysis cells.
  • the cladding is detachable and is particularly suitable for use on new and used side walls of electrolysis cells that work according to the amalgam process.
  • the non-removable cover made of rubber is in other cases with an additionally glued plate made of z.
  • B. provided ethylene-propylene terpolymer (compare e.g.
  • the rubber coating must first be removed. This is usually done by strongly cooling the rubber coating, which makes the rubber coating brittle, and by subsequent mechanical removal, for. B. chiseling the adhering rubber residues.
  • Cladding the side walls with a combination of rubber and an additional polymer layer as described above is complex to manufacture and also expensive. If the rubber coating is damaged, moist chlorine will reach the surface of the side cheeks, which is usually made of steel, causing severe corrosion of the steel part. Proper repair welding of the bonded polymer cladding is practically impossible.
  • the invention has for its object to provide cladding for used or new side walls, for example of electrolysis equipment, which do not have the disadvantages of the prior art described above and which should be easy to solve, especially for repair purposes.
  • the cladding is made of welded or edged plates made of special plastics, which are attached to the base of the apparatus together with a steel part that provides stability.
  • the invention relates to a corrosion-protecting side wall for apparatus for receiving chlorine-containing process gases, in particular for electrolysis cells, which is characterized in that a cladding made of optionally welded or edged plates made of polyvinylidene fluoride (PVDF), polytertrafluoroethylene-co- on a metal support structure made of steel or stainless steel in particular hexafluoropropylene (FEP), polyvinyl chloride (PVC or PVC-HT) or perfluoroalkoxy polymer (PFA) and if necessary fixed for assembly with a releasable adhesive that can be connected to the bottom of the apparatus or other side parts using releasable fasteners.
  • PVDF polyvinylidene fluoride
  • FEP hexafluoropropylene
  • PVC or PVC-HT polyvinyl chloride
  • PFA perfluoroalkoxy polymer
  • the individual plastic sheets for the production of the cladding can be folded and connected to the support structure under optimal conditions before assembly, e.g. by welding.
  • the entire surface of the metal support structure can also be protected against corrosion e.g. a coating with DD lacquers or with epoxy resins.
  • the cladding If the cladding is damaged, it can be repaired under simple conditions after it has been removed from the side cheek.
  • the structurally influenceable gap between the cladding and the support structure also allows the cladding to be checked for leaks.
  • thermal insulation for example based on closed-pore polymer foams, in particular polyurethane foam, is additionally provided between the support structure and the cladding.
  • plastic materials to be used according to the invention have a high coefficient of thermal expansion, tests have shown that the plastics mentioned are well suited for cladding the side walls of electrolysis cells.
  • the proposed detachable side parts are used in particular in electrolysis cells for the production of chlorine by the amalgam process.
  • Sensors can be installed in the space between the cladding and the side wall support structure, which perform a leakage test, e.g. for leaking chlorine or saline.
  • Fig. 1 shows a side view of an embodiment of the invention
  • FIG. 1 shows a side wall 4 of an electrolysis cell in which chlorine is produced by the amalgam process.
  • a loose cladding 1 made of PVDF panels lies on a steel support structure 3.
  • the cladding 1 was produced from individual PVDF segments by welding prior to assembly on the side wall.
  • An insulating layer 2 made of polyurethane foam is additionally provided between the support structure 3 and the cladding 1.
  • the holes 5 are used to mount the side wall 4 on the electrolytic cell base 6 by means of screws 10 (see also FIG. 2).
  • Chlorine-resistant seals 7 or 8 seal the gap between cell cover 9 and side wall 4 or between cell bottom 6 and side wall 4 in order to prevent the escape of chlorine-containing gas 11 or salt solution 12.

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)
  • Electrolytic Production Of Metals (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Laminated Bodies (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Building Environments (AREA)

Abstract

The invention concerns an anti-corrosive wall-covering (1) for side walls (4) in apparatus for holding chlorine-containing process gases, in particular in electrolytic cells. The covering is detachable and is suitable in particular for use in new and used side pieces of electrolytic cells operating according to the amalgam process.

Description

Wandverkleidung für ElektrolvsezellenWall covering for electrolysis cells
Die Erfindung betrifft eine korrosionsschützende Wandverkleidung von Seitenwänden in Apparaturen zur Aufnahme chlorhaltiger Prozessgase, insbesondere in Elektrolyse- zellen. Die Verkleidung ist lösbar und eignet sich besonders für den Einsatz bei neuen und gebrauchten Seitenwangen von Elektrolysezellen, die nach dem Amalgam- verfahren arbeiten.The invention relates to a corrosion-protecting wall cladding of side walls in apparatus for receiving chlorine-containing process gases, in particular in electrolysis cells. The cladding is detachable and is particularly suitable for use on new and used side walls of electrolysis cells that work according to the amalgam process.
Für das Verkleiden von Seitenteilen von Elektrolysezellen für das Amalgamverfahren, die gewöhnlich aus Metall gefertigt sind, sind verschiedene Verfahren bekannt. Üblich ist das Aufbringen einer nicht lösbaren Verkleidung aus Gummi (synthetischer oder Naturkautschuk).Various methods are known for cladding side parts of electrolysis cells for the amalgam process, which are usually made of metal. It is common to apply a non-detachable covering made of rubber (synthetic or natural rubber).
Die nicht lösbare Verkleidung aus Gummi wird in anderen Fällen mit einer zusätzlich aufgeklebten Platte aus z. B. Ethylen-Propylen-Terpolymer versehen (vergleiche z.B.The non-removable cover made of rubber is in other cases with an additionally glued plate made of z. B. provided ethylene-propylene terpolymer (compare e.g.
US 3 450 621).US 3,450,621).
An gummierten Seitenwangen bilden sich durch Reaktion mit Chlorgas unter Umständen dioxin- und furanhaltige Reaktionsprodukte. Diese sind aufgrund ihrer Toxizi- tat unerwünschte Begleitstoffe, die kostspielig entsorgt werden müssen. Soll eineReaction with chlorine gas may form dioxin and furan-containing reaction products on rubberized side walls. Due to their toxicity, these are undesirable accompanying substances that have to be disposed of costly. Should one
Seitenwange einer Elektrolyseapparatur neu beschichtet werden, so muß zuvor die Gummierung entfernt werden. Dies geschieht üblicherweise durch starkes Abkühlen der Gummierung, wodurch die Gummierung versprödet, und durch anschließendes mechanisches Entfernen z. B. Abmeißeln der anhaftenden Gummireste.If the side wall of an electrolysis apparatus is newly coated, the rubber coating must first be removed. This is usually done by strongly cooling the rubber coating, which makes the rubber coating brittle, and by subsequent mechanical removal, for. B. chiseling the adhering rubber residues.
Eine Verkleidung von Seitenwangen mit einer Kombination aus Gummi und zusätzlicher Polymerschicht wie oben beschrieben ist aufwendig in der Herstellung und zudem teuer. Bei einer Beschädigung der Gummierung gelangt feuchtes Chlor an die Oberfläche der Seitenwangen, die üblicherweise aus Stahl gefertigt ist, wobei eine starke Korrosion des Stahlteiles einsetzt. Eine fachgerechte Reparaturschweißung der verklebten Polymerverkleidung ist praktisch nicht möglich. Der Erfindung liegt die Aufgabe zugrunde, Verkleidungen für gebrauchte oder neue Seitenwangen z.B. von Elektrolyseapparaturen bereitzustellen, die nicht die Nachteile des oben beschriebenen Standes der Technik haben und die vor allem zu Reparaturzwecken leicht lösbar sein sollen.Cladding the side walls with a combination of rubber and an additional polymer layer as described above is complex to manufacture and also expensive. If the rubber coating is damaged, moist chlorine will reach the surface of the side cheeks, which is usually made of steel, causing severe corrosion of the steel part. Proper repair welding of the bonded polymer cladding is practically impossible. The invention has for its object to provide cladding for used or new side walls, for example of electrolysis equipment, which do not have the disadvantages of the prior art described above and which should be easy to solve, especially for repair purposes.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Verkleidung aus geschweißten oder gekanteten Platten aus speziellen Kunststoffen gefertigt wird, die zusammen mit einem stabilitätgebenden Stahlteil am Apparateboden befestigt werden.This object is achieved in that the cladding is made of welded or edged plates made of special plastics, which are attached to the base of the apparatus together with a steel part that provides stability.
Gegenstand der Erfindung ist eine korrosionsschützende Seitenwand für Apparaturen zur Aufnahme chlorhaltiger Prozessgase, insbesondere für Elektrolysezellen, die dadurch gekennzeichnet ist, daß auf einer Metalltragestruktur aus insbesondere Stahl oder Edelstahl eine Verkleidung aus gegebenenfalls geschweißten oder gekanteten Platten aus Polyvinylidenfluorid (PVDF), Polytertrafluorethylen-co-hexafluorpropylen (FEP), Polyvinylchlorid (PVC oder PVC-HT) oder Perfluoralkoxypolymer (PFA) aufgelegt und gegebenenfalls zur Montage mit einem lösbaren Kleber fixiert ist, die mit dem Apparateboden oder weiteren Seitenteilen über lösbare Befestigungsmittel verbindbar ist.The invention relates to a corrosion-protecting side wall for apparatus for receiving chlorine-containing process gases, in particular for electrolysis cells, which is characterized in that a cladding made of optionally welded or edged plates made of polyvinylidene fluoride (PVDF), polytertrafluoroethylene-co- on a metal support structure made of steel or stainless steel in particular hexafluoropropylene (FEP), polyvinyl chloride (PVC or PVC-HT) or perfluoroalkoxy polymer (PFA) and if necessary fixed for assembly with a releasable adhesive that can be connected to the bottom of the apparatus or other side parts using releasable fasteners.
Die einzelnen Kunststoffplatten zur Herstellung der Verkleidung können gekantet und unter optimalen Bedingungen vor der Montage mit der Tragestruktur miteinander verbunden werden, z.B. durch Schweißen. Die gesamte Oberfläche der Tragestruktur aus Metall kann zusätzlich mit Korrosionsschutz z.B. einer Lackierung mit DD-Lacken oder mit Epoxidharzen versehen werden.The individual plastic sheets for the production of the cladding can be folded and connected to the support structure under optimal conditions before assembly, e.g. by welding. The entire surface of the metal support structure can also be protected against corrosion e.g. a coating with DD lacquers or with epoxy resins.
Bei Beschädigung der Verkleidung ist nach ihrer Entfernung von der Seitenwange eine Reparatur der Verkleidung unter einfachen Bedingungen möglich. Der konstruktiv beeinflußbare Spalt zwischen Verkleidung und Tragestruktur erlaubt darüber hinaus eine Überprüfung der Verkleidung auf Dichtigkeit. Zwischen Tragestruktur und Verkleidung ist insbesondere zusätzlich eine Wärmeisolierung, z.B. auf Basis geschlossenporiger Polymerschäume, insbesondere von Polyurethanschaum, vorgesehen.If the cladding is damaged, it can be repaired under simple conditions after it has been removed from the side cheek. The structurally influenceable gap between the cladding and the support structure also allows the cladding to be checked for leaks. In addition, thermal insulation, for example based on closed-pore polymer foams, in particular polyurethane foam, is additionally provided between the support structure and the cladding.
Obwohl die erfindungsgemäß einzusetzenden Kunststoffmaterialien einen hohen Wärmeausdehnungskoeffizienten aufweisen, zeigte sich in Versuchen, daß die genannten Kunststoffe gut für Verkleidungen von Seitenwangen von Elektrolysezellen geeignet sind.Although the plastic materials to be used according to the invention have a high coefficient of thermal expansion, tests have shown that the plastics mentioned are well suited for cladding the side walls of electrolysis cells.
Die vorgeschlagenen lösbaren Seitenteile werden insbesondere in Elektrolysezellen zur Herstellung von Chlor nach dem Amalgamverfahren eingesetzt.The proposed detachable side parts are used in particular in electrolysis cells for the production of chlorine by the amalgam process.
Im Zwischenraum zwischen der Verkleidung und der Seitenwandtragestruktur können Sensoren angebracht sein, die eine Leckageprüfung, z.B. auf austretendes Chlor oder Salzlösung, ermöglichen.Sensors can be installed in the space between the cladding and the side wall support structure, which perform a leakage test, e.g. for leaking chlorine or saline.
Die Erfindung wird nachstehend beispielhaft anhand der Figuren näher erläutert, ohne daß die Erfindung im einzelnen eingeschränkt istThe invention is explained in more detail below by way of example with reference to the figures, without the invention being restricted in detail
Fig. 1 zeigt in einer seitlichen Aufsicht eine Ausführungsform der erfindungsgemäßenFig. 1 shows a side view of an embodiment of the invention
Apparateverkleidung.Apparel clothing.
Fig. 2 zeigt einen Teil einer Elektrolysezelle mit erfindungsgemäßer Seitenwand 2 shows part of an electrolysis cell with a side wall according to the invention
Beispielexample
In Fig. 1 ist eine Seitenwand 4 einer Elektrolysezelle gezeigt, in der Chlor nach dem Amalgamverfahren hergestellt wird. Auf einer Tragestruktur 3 aus Stahl liegt eine lose Verkleidung 1 aus PVDF-Platten auf. Die Verkleidung 1 ist vor der Montage auf der Seitenwand aus einzelnen PVDF-Segmenten durch Verschweißen hergestellt worden. Zwischen Tragestruktur 3 und Verkleidung 1 ist zusätzlich eine Isolierschicht 2 aus Polyurethanschaum vorgesehen. Die Bohrungen 5 dienen zur Montage der Seitenwand 4 am Elektrolysezellenboden 6 mittels Schrauben 10 (siehe auch Fig.2).1 shows a side wall 4 of an electrolysis cell in which chlorine is produced by the amalgam process. A loose cladding 1 made of PVDF panels lies on a steel support structure 3. The cladding 1 was produced from individual PVDF segments by welding prior to assembly on the side wall. An insulating layer 2 made of polyurethane foam is additionally provided between the support structure 3 and the cladding 1. The holes 5 are used to mount the side wall 4 on the electrolytic cell base 6 by means of screws 10 (see also FIG. 2).
Fig. 2 zeigt einen Teil einer Elektrolysezelle mit einem Schnitt durch eine Seitenwand 4. Zur Vermeidung von Korrosion auch an der Innenseite der Seitenwand 4 ist diese mit einem DD-Lack als Korrosionsschutz angestrichen. Chlorbeständige Dichtungen 7 oder 8 sorgen für eine Abdichtung des Spaltes zwischen Zellendeckel 9 und Seiten- wand 4 bzw. zwischen dem Zellenboden 6 und der Seitenwand 4, um den Austritt von chlorhaltigem Gas 11 oder Salzlösung 12 zu verhindern. 2 shows part of an electrolysis cell with a section through a side wall 4. To avoid corrosion, also on the inside of the side wall 4, this is coated with a DD varnish as corrosion protection. Chlorine-resistant seals 7 or 8 seal the gap between cell cover 9 and side wall 4 or between cell bottom 6 and side wall 4 in order to prevent the escape of chlorine-containing gas 11 or salt solution 12.

Claims

Patentansprüche claims
1. Korrosionsschützende Seitenwand (4) für Apparaturen zur Aufnahme chlorhaltiger Prozessgase, insbesondere für Elektrolysezellen, dadurch gekenn- zeichnet, daß auf einer Metalltragestruktur (3) eine Verkleidung (1) aus gegebenenfalls geschweißten oder gekanteten Platten aus Polyvinylidenfluorid (PVDF), Polytetrafluorethylen-co-hexafluorpropylen (FEP), Polyvinylchlorid (PVC oder PVC-HT) oder Perfluoralkoxypolymer (PFA) aufgelegt ist, die mit dem Apparateboden (6) oder weiteren Seitenteilen (4') über lösbare Befestigungsmittel (10) verbindbar ist.1. Corrosion-protecting side wall (4) for apparatus for receiving chlorine-containing process gases, in particular for electrolysis cells, characterized in that on a metal support structure (3) a cladding (1) from optionally welded or edged plates made of polyvinylidene fluoride (PVDF), polytetrafluoroethylene-co -hexafluoropropylene (FEP), polyvinyl chloride (PVC or PVC-HT) or perfluoroalkoxy polymer (PFA) is placed, which can be connected to the apparatus base (6) or other side parts (4 ') via releasable fastening means (10).
2. Seitenwand gemäß Anspruch 1, dadurch gekennzeichnet, daß die Verkleidung (1) zur Montage mit einem lösbaren Kleber auf der Tragestruktur (3) fixiert ist.2. Side wall according to claim 1, characterized in that the covering (1) for mounting with a releasable adhesive on the support structure (3) is fixed.
3. Seitenwand gemäß den Ansprüchen 1 bis 2, dadurch gekennzeichnet, daß die Tragestruktur (3) aus Stahl oder Edelstahl besteht.3. Side wall according to claims 1 to 2, characterized in that the support structure (3) consists of steel or stainless steel.
4. Seitenwand gemäß den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß zwi- sehen Tragestruktur (3) und Verkleidung (1) eine zusätzliche Isolierschicht (2) aus geschlossenporigem Polymerschaum, insbesondere aus Polyurethanschaum, vorgesehen ist. 4. Side wall according to claims 1 to 3, characterized in that between see support structure (3) and cladding (1) an additional insulating layer (2) made of closed-pore polymer foam, in particular made of polyurethane foam, is provided.
EP98901940A 1997-01-10 1998-01-03 Wall-covering for electrolytic cells Expired - Lifetime EP0951584B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19700533A DE19700533A1 (en) 1997-01-10 1997-01-10 Wall covering for electrolytic cells
DE19700533 1997-01-10
PCT/EP1998/000017 WO1998030736A1 (en) 1997-01-10 1998-01-03 Wall-covering for electrolytic cells

Publications (2)

Publication Number Publication Date
EP0951584A1 true EP0951584A1 (en) 1999-10-27
EP0951584B1 EP0951584B1 (en) 2002-05-02

Family

ID=7817049

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98901940A Expired - Lifetime EP0951584B1 (en) 1997-01-10 1998-01-03 Wall-covering for electrolytic cells

Country Status (11)

Country Link
US (1) US6200437B1 (en)
EP (1) EP0951584B1 (en)
JP (1) JP2001508126A (en)
CN (1) CN1243552A (en)
AU (1) AU5861798A (en)
BR (1) BR9807469A (en)
CA (1) CA2277026A1 (en)
DE (2) DE19700533A1 (en)
ES (1) ES2176949T3 (en)
RU (1) RU2198246C2 (en)
WO (1) WO1998030736A1 (en)

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Publication number Priority date Publication date Assignee Title
ITMI20060309A1 (en) * 2006-02-21 2007-08-22 De Nora Elettrodi Spa ELECTRONIC CELL HEAD CATODO OF MERCURY OF ALKALINE CHLORIDE SOLUTIONS

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US3962066A (en) * 1974-01-30 1976-06-08 Barber-Webb Resilient liner for an electrolytic cell
FR2303093A1 (en) * 1975-03-06 1976-10-01 Rhone Poulenc Ind ELECTROLYSIS CELL WITHOUT DIAPHRAGM, ESPECIALLY FOR OBTAINING CHLORATES FROM ALKALINE METALS
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Also Published As

Publication number Publication date
JP2001508126A (en) 2001-06-19
EP0951584B1 (en) 2002-05-02
RU2198246C2 (en) 2003-02-10
DE19700533A1 (en) 1998-07-16
CN1243552A (en) 2000-02-02
AU5861798A (en) 1998-08-03
WO1998030736A1 (en) 1998-07-16
US6200437B1 (en) 2001-03-13
CA2277026A1 (en) 1998-07-16
ES2176949T3 (en) 2002-12-01
BR9807469A (en) 2000-05-02
DE59803975D1 (en) 2002-06-06

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