EP0280359B1 - Joints d'étanchéité pour les cadres d'électrode d'un électrolyseur à membrane - Google Patents

Joints d'étanchéité pour les cadres d'électrode d'un électrolyseur à membrane Download PDF

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Publication number
EP0280359B1
EP0280359B1 EP88200266A EP88200266A EP0280359B1 EP 0280359 B1 EP0280359 B1 EP 0280359B1 EP 88200266 A EP88200266 A EP 88200266A EP 88200266 A EP88200266 A EP 88200266A EP 0280359 B1 EP0280359 B1 EP 0280359B1
Authority
EP
European Patent Office
Prior art keywords
membrane
gasket
frame
sealing
core frame
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
EP88200266A
Other languages
German (de)
English (en)
Other versions
EP0280359A1 (fr
Inventor
Peter Andres
Manfred Bodenburg
Wolfgang Türke
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.)
GEA Group AG
Original Assignee
Metallgesellschaft 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 Metallgesellschaft AG filed Critical Metallgesellschaft AG
Priority to AT88200266T priority Critical patent/ATE57718T1/de
Publication of EP0280359A1 publication Critical patent/EP0280359A1/fr
Application granted granted Critical
Publication of EP0280359B1 publication Critical patent/EP0280359B1/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
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/70—Assemblies comprising two or more cells
    • C25B9/73—Assemblies comprising two or more cells of the filter-press type
    • C25B9/77—Assemblies comprising two or more cells of the filter-press type having diaphragms
    • 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
    • C25B9/60—Constructional parts of cells

Definitions

  • the invention relates to a seal for the pressed-together electrode frame of a membrane electrolysis for the production of sodium hydroxide solution, hydrogen and chlorine from a NaCl brine, the edge of the membrane lying between the two-part seal.
  • the membrane used for this electrolysis generally has ion exchange properties, so that water can also pass through in addition to the sodium migrating through the membrane.
  • the consequence of the water transport property of the membrane is that problems can occur when sealing the membrane electrolysis device. In particular, care must be taken that no water escapes through the narrow side of the membrane. In order to prevent this, the membrane in the sealing area must be pressed together. If rubber seals are used on both sides of the membrane, the seals expand under the contact pressure parallel to the membrane surface and lead to damage or destruction of the membrane by this movement.
  • the invention has for its object to find a seal that can transmit perpendicularly acting on the membrane, sufficiently high forces, but without such a change in shape of the seal occurs, which transmits large forces acting parallel to the membrane.
  • the seal must also be resistant to the liquid present in the electrolysers, since this is an unsaturated saline solution which, in addition to chlorate and chlorous acid, contains dissolved and gaseous chlorine at a pH of about 4.5.
  • the object is achieved in that at least one sealing part consists of a core frame and at least one sealing frame made of graphite placed on the core frame and the core frame and the sealing frame are surrounded by a film cover made of polytetrafluoroethylene.
  • the core frame which e.g. consists of asbestos, especially the better handling of the sealing part, since the sealing frame made of graphite is usually thin and narrow.
  • the foil cover ensures the corrosion resistance of the sealing part.
  • Pressing pressures in the range from 700 to 2000 N / cm 2 and preferably 900 to 1500 N / cm 2 are used for sealing. At these not too high pressing pressures, it is usually sufficient to form only one sealing part of the two-part seal located on both sides of the membrane in the manner according to the invention and to use a rubber seal for the other sealing part.
  • the sealing frame made of graphite can be made rather narrow, so that the sealing area of the rubber seal is also narrow and is not significantly deformed parallel to the membrane surface.
  • the drawing shows a vertical section through the sealing area of a membrane electrolyzer, the parts being shown pulled apart.
  • the frame of the anode A and also the cathode K consists of a square tube, but e.g. a round tube is also possible.
  • a rubber seal (2) is located between the membrane (1) and the cathode compartment.
  • the sealing part (3) between the membrane (1) and the anode tube consists of a flat core frame (4) made of asbestos, the two attached sealing frames (5,6) made of graphite and the foil cover (7) made of PTFE.
  • the sealing frame (5) facing the anode A can also be dispensed with.
  • the casing (7) ensures that the chlorine formed on the anode plates (10) does not destroy the sealing part (3).
  • the hydrogen formed on the cathode plate (11) and the sodium hydroxide solution formed there are much less aggressive, so that the rubber seal (2) can be used in this area.
  • the rubber seal (2) can also be replaced by a seal corresponding to the sealing part (3).
  • the parts are shown pulled apart; they are pressed together in the direction of arrows (8) and (9).
  • the graphite sealing frames (5, 6) ensure that no noteworthy forces act perpendicular to the contact pressure on the membrane (1) in the sealing area, which could damage the membrane.
  • the rubber seal (2) on the one hand and the sealing part (3) on the other hand squeeze the membrane (1) in the sealing area so that no liquid can pass through the membrane to the outside.
  • special graphite can preferably be used, which has a certain elasticity only in the direction of the arrows (8) and (9), but not perpendicular to it.
  • the thickness of the graphite sealing frame (5,6) is usually in the range of 0.5 to 2 mm.
  • the PTFE sleeve (7) is preferably 0.3 mm thick.

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)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
  • Sealing Material Composition (AREA)
  • Sealing Devices (AREA)

Claims (2)

1. Joint d'étanchéité pour cadres d'électrode pressés les uns sur les autres d'un électrolyseur à membrane pour la production de lessive de soude caustique, d'hydrogène et de chlore à partir d'une saumure de NaCI, tandis que le bord de la membrane se trouve entre les deux parties du joint, caractérisé en ce qu'au moins une partie du joint est constituée d'un cadre central et d'au moins un cadre d'étanchéité en graphite appliqué sur un côté du cadre central, et que le cadre central et le cadre d'étanchéité sont entourés par une enveloppe mince en polytétrafluoréthylène.
2. Joint d'étanchéité selon la revendication 1, caractérisé en ce que le cadre central est réalisé en amiante.
EP88200266A 1987-02-25 1988-02-13 Joints d'étanchéité pour les cadres d'électrode d'un électrolyseur à membrane Expired - Lifetime EP0280359B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88200266T ATE57718T1 (de) 1987-02-25 1988-02-13 Dichtung fuer die elektrodenrahmen einer membranelektrolyse.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3705926A DE3705926C1 (de) 1987-02-25 1987-02-25 Dichtung fuer die Elektrodenrahmen einer Membranelektrolyse
DE3705926 1987-02-25

Publications (2)

Publication Number Publication Date
EP0280359A1 EP0280359A1 (fr) 1988-08-31
EP0280359B1 true EP0280359B1 (fr) 1990-10-24

Family

ID=6321665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88200266A Expired - Lifetime EP0280359B1 (fr) 1987-02-25 1988-02-13 Joints d'étanchéité pour les cadres d'électrode d'un électrolyseur à membrane

Country Status (8)

Country Link
US (1) US4776940A (fr)
EP (1) EP0280359B1 (fr)
JP (1) JPS63227795A (fr)
AT (1) ATE57718T1 (fr)
AU (1) AU1209988A (fr)
BR (1) BR8800766A (fr)
DE (2) DE3705926C1 (fr)
ES (1) ES2018333B3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4940518A (en) * 1988-09-26 1990-07-10 The Dow Chemical Company Combination seal member and membrane holder for a filter press type electrolytic cell
DE19750313A1 (de) * 1997-11-13 1999-05-27 Gore W L & Ass Gmbh Elektrolysezellenanordnung und Verfahren zum Abdichten einer Elektrolysezelle
DE19750314A1 (de) * 1997-11-13 1999-05-27 Gore W L & Ass Gmbh Elektrolysezellenanordnung und Verfahren zum Abdichten einer Elektrolysezelle
DE102004041043B3 (de) * 2004-08-25 2006-03-30 Klinger Ag Laminiertes Dichtungsmaterial und Verfahren zu seiner Herstellung
CN102936736A (zh) * 2012-11-19 2013-02-20 扬州中电制氢设备有限公司 包边隔膜垫片

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3984304A (en) * 1974-11-11 1976-10-05 Ppg Industries, Inc. Electrode unit
US4013535A (en) * 1976-06-07 1977-03-22 The B. F. Goodrich Company Electrolyte separator tensioning device
US4217199A (en) * 1979-07-10 1980-08-12 Ppg Industries, Inc. Electrolytic cell
US4332661A (en) * 1980-11-05 1982-06-01 Olin Corporation Cells having gasket lubricating means
US4431502A (en) * 1980-11-05 1984-02-14 Olin Corporation Sealing means for filter press cells
US4441977A (en) * 1980-11-05 1984-04-10 Olin Corporation Electrolytic cell with sealing means
GB2098238B (en) * 1981-05-07 1984-10-24 Electricity Council An electrochemical cell
US4344633A (en) * 1981-05-22 1982-08-17 Diamond Shamrock Corporation Gasket for electrolytic cell
US4610765A (en) * 1984-09-24 1986-09-09 The Dow Chemical Company Seal means for electrolytic cells
US4721555A (en) * 1985-08-02 1988-01-26 The Dow Chemical Company Electrolysis cell seal means

Also Published As

Publication number Publication date
BR8800766A (pt) 1988-10-04
ES2018333B3 (es) 1991-04-01
JPS63227795A (ja) 1988-09-22
DE3705926C1 (de) 1988-08-18
US4776940A (en) 1988-10-11
AU1209988A (en) 1988-09-01
ATE57718T1 (de) 1990-11-15
EP0280359A1 (fr) 1988-08-31
DE3860841D1 (de) 1990-11-29

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