EP1477584A2 - Gasket for electrolytic cell - Google Patents

Abstract

Seal assembly (6) comprises first and second sheet surfaces separated by first and second, cord-like seals (9, 10) also acting as spacers. The spacing between the seals (9, 10) is a multiple of their maximum thickness. An independent claim is included for the corresponding method of manufacture.

Description

The invention relates to a seal for an electrolytic cell, a method for their production and an electrolytic cell arrangement with such Poetry.

The electrolytic cells are used, for example, to produce chromic acid, molecular hydrogen, molecular oxygen, chlorine and alkali metal hydroxides used by electrolysis, with increasing electrolysis cells membrane type are used. From EP 1 029 118 B1 (W.L. Gore & Associates) is known to have an electrolytic cell seal in a simple manner can be used between two electrolytic cell halves, since they are designed as one piece Seal can be handled independently. Taking into account the considerable Dimensions of the electrolytic cell halves, for example 2.5 mx 1.3 m in the case of electrolysis cells for producing chlorine from a salt solution with the formation of sodium hydroxide solution and due to the resulting Sealing length of over 7.5 m, the ease of handling is an essential Aspect for electrolytic cell seals.

A concrete electrolytic cell seal according to the teaching of EP 1 029 118 B1 is explained below with reference to FIG. 2. Only a relevant sealing section of the cell is shown. The electrolytic cell is usually used hanging, as shown. It comprises two housing halves 1 and 2 with cathode 3 or anode 4 accommodated therein. The cathode compartment contains, for example, sodium hydroxide solution (NaOH in water) and gaseous hydrogen H ₂ as the electrolysis product, and the anode compartment contains a salt solution (NaCl in water) and gaseous chlorine Cl as the electrolysis product _2nd Anode space and cathode space are separated from each other by an ion exchange membrane 5, through which the ion exchange of Na + ions takes place from the anode to the cathode space. The two housing halves 1 and 2 are connected to one another via a flange bore 7 by means of a screw connection, not shown, with the interposition of a seal 6. The seal 6 have several functions. On the one hand, the seal 6 prevents the sodium hydroxide solution and the salt solution from escaping as well as the uncontrolled escape of H ₂ or Cl ₂ from the electrolysis cell. In addition, the seal is not only liquid-tight but also gas-tight. Gas tightness means a leak rate of less than 0.01 mg / ms at a surface pressure of 10 MPa. In addition, the seal 6 electrically isolates the two housing halves 1 and 2 from one another. After all, there is a voltage of approx. 3 V at 4.5 kA when generating chlorine. Finally, the seal 6 also serves to fix the sensitive ion exchange membrane 5, in that the latter is clamped between the seal 6 and a housing half, for example the cathode housing 2. The seal 6 in turn consists of a double-folded ePTFE film, in which a sealing cord 9 made of rolled ePTFE film and a flat, lattice-shaped spacer structure 10 are accommodated. The spacer structure 10 is fixed on one side with an adhesive 11 with the double-folded ePTFE film 8. Within the seal 6, the sealing cord 9 has a predominantly sealing function and the spacer structure 10 has a predominantly spacing function. Accordingly, the spacer structure 10 cannot be compressed, or at least can only be compressed slightly, while the sealing cord 9 can be deformed and compressed by compression. FIG. 2 shows the seal in the pre-assembly state, ie in the uncompressed state.

However, the electrolytic cell seal known from EP 1 029 118 B1 is shown in room for improvement in various respects. For example, the known one Sealing both material and manufacturing-intensive. Both strikes. reflected in the manufacturing costs. The production is done by hand and can with the aforementioned dimensions taking into account the following discussed measures up to 1.5 hours per seal to take.

It has been shown when using the known seal 6 that the sealing cord 9 migrates in the sealing gap between the double-folded film 8. This In extreme cases, the cell may leak and / or the membrane may tear. 5 have as a consequence. An attempt has therefore been made to use sealing cord 9 on both sides along the sealing cord 9 running seams 12 penetrating the film 8 to fix locally. But this doesn't just mean additional work, but there was also corrosion of the titanium-coated housing half 2 in particular in the area of the membrane 8 produced thereby Seam holes found. An additional masking of the seams 12 by means of a suitable masking tape again means additional material and manufacturing costs.

In practice, therefore, a stable frame is often made of electricity instead insulating, sintered PTFE with the appropriate dimensions of z. B. 2.5 m x 1.3 m and a circumferential width of, for example, 54 mm for certain electrolysis cells used for chlorine production. Such frames are difficult to transport because they must not be kinked. The two electrolytic cell housing halves, between which the frame then are placed with a narrow, thin sealing tape made of monodirectionally stretched PTFE, the two sealing tapes May only partially overlap over the entire sealing length. there assembly errors easily occur. Repairs are expensive, so the seals from the outset should only be assembled by specially trained personnel. The adhesive residues of the sealing tape on the housing halves are also problematic, if the seals are routinely used when replacing the ion exchange membrane be renewed after about four years. While with this Process of so-called "remembraning" of the seal to be disposed of can, the electrolytic cell housing halves are reused. The Cleaning the adhesive from the housing halves is complex.

There is therefore still a need for an easy to handle Seal especially for use in electrolytic cell assemblies suitable is. The object of the present invention is therefore in particular that to improve the seal known from EP 1 029 118 B1.

In this respect, in connection with the invention described below, unless specifically stated otherwise, the same materials for the individual components of the seal are used as related are described in EP 1 029 118 B1.

According to a first aspect of the invention, the flat, lattice-shaped spacer structure the known seal by a cord-shaped spacer component replaced, which in contrast to the known seal a multiple of their maximum thickness or their maximum diameter of the sealing cord is removed. This results in the assembled state of the Seal two spaced, linear sealing lines, one of which however, only the internal sealing cord has an effective sealing effect.

Replacing the spacer structure with a string offers several Benefits. On the one hand, this reduces the amount of material processed, which means Procurement and storage costs can be reduced. On the other hand, one Cord much easier to process, especially with less mechanical Effort as a large spacer structure. By spacing the spacer cord from the sealing cord is still reached, that when the seal is clamped, the two halves of the housing tilt can be reduced to an insignificant degree.

In contrast to the prior art, the sealing cord can be inside the seal spacing function to the same extent as the spacer cord. Because the seal is typically for use with a certain compression pressure is provided, the two cords should this compression pressure have approximately the same compressed thickness. Ideally, this can be achieved by having both cords from the same Material exist or at least the same or approximately the same compressibility have, so that they are in the uncompressed pre-assembly state the foils, between which they are arranged, at approximately the same distance hold. In particular, the two can be arranged between the foils Lines also in the co-extrusion process with one connecting the two lines Bridge are made. However, since the sealing cord in addition to the spacing function in particular sealing function and the Sealing cord consists of comparatively high quality and expensive material, becomes a completely different, essential for the spacer cord cheaper material selected than for the sealing cord.

For example, the cord replacing the spacer structure can be also act as a wire. The cross section of the cord is from of minor importance and can also be oval, for example. He should but not be flat over a large area, just as possible as with the sealing cord to achieve a narrow sealing line, thus a high surface pressure with low Screw forces can be achieved.

It is also possible to coextrude the two cords into one film to integrate. Then the two cords lie between two foil surfaces the extruded film. Separate foils can then be omitted. Under suitable The two cords may even be sufficient in the extrusion process with a web connecting them as a solid material without produce additional outer foils and use them as seals. Because that Danger of relative displacement of the two cords, which then rather than cord-shaped sealing components are due to the connecting bridge locked out.

The screw holes preferably lie over which the two housing halves be clamped together between this spacer cord and the Sealing cord. This allows an even load distribution on both cords can be achieved. The screw holes can easily be removed from the seal to be punched out.

According to a second aspect of the invention, the two foils are between which the cords are picked up by a heat stable up to 100 ° C Adhesive bonded together. Surprisingly, this can make hiking the sealing cord in the sealing gap between the foils can be avoided. It it is believed that this wandering observed in the prior art Sealing cord on the lack of heat resistance of the used there Glue is due. After all, the working temperatures are from Electrolysis cells for chlorine production at up to 90 ° C. Through a warm stable The cords are now glued between the foils fixed securely. Sewing the cords to prevent theirs Hiking is not necessary. This also means there are no seam holes, through which corrosion from the cathode compartment to the anode compartment or vice versa.

To the two foils in a simple manner in a thermal joining process To be able to connect to one another, the adhesive can preferably be activated thermally. For example, it can be a thermally activated two-component glue or a thermoplastic glue, in particular Based on a fluoropolymer. Fluoropolymers are because of their chemical resistance particularly suitable. It is sufficient if one of the slides is included this adhesive is pre-coated. A coating from the thermoplastic Plastic ethylene-fluoroethylene propylene (EFEP) is particularly preferred. EFEP is a copolymer of ethylene, tetrafluoroethylene and hexafluoropropylene. Alternatively, the coating can be made of PVDF, ETFE, ECTFE, PFA or FEP exist.

The coating comes in addition to its function as a connection or Welding agents also have the importance of being a diffusion barrier. The diffusion corrosive substances through the ion exchange membrane and further through the two foils of the seal from the anode compartment to the cathode compartment (or vice versa) is made even more difficult.

According to a third aspect of the invention, the seal is at its the Side facing the electrolysis cell is equipped with a spacer material, which ensures that the seal, when assembled, the sealing gap fills out as completely as possible. The thickness of the spacer material corresponds to this approximately the thickness of the seal if it is a predetermined in the assembled state Compression pressure is exposed, minus the total thickness of the two (uncompressed) slides. The spacer material can be made from a very soft chemically resistant material, especially one Fluoropolymer so that even in the event that it is in the compressed state the seal is also compressed, none or at least essentially absorbs no compression forces.

The purpose of the spacer material is to seal the Area between the electrolytic cell spaces and the inner sealing cord close contact with the sealing flanges of the electrolytic cell halves; to prevent dead spaces in which electrolysis products such as lye. This measure too has proven to be important for corrosion prevention. It it is assumed that such dead spaces exist in the known seal formed. In the absence of a constant flushing of such dead spaces, it happened probably to a moisture removal of the ion exchange membrane and thereby on their embrittlement in the area of the sealing gap. It is also believed that Sodium hydroxide solution from the cathode compartment through the embrittled membrane areas and further through the foils of the seal to the housing wall of the could reach the electrolytic cell half defining the cathode space and there led to corrosion of the titanium-coated housing plate. By Filling the dead spaces with the spacer material will dry out the ion exchange membrane and the associated corrosion due to it effectively prevents substances passing through the membrane.

The spacer material can be between the two foils or on one side on one of the two foils. It can in turn be a film material and in particular be identical to the material of the two foils, e.g. from ePTFE.

The advantages achieved by means of the aforementioned three aspects according to the invention compared to the seal known from EP 1 029 118 B1 each independently, but can be combined reinforce each other.

The seal is advantageously flat on one side and on the other side through the cords between the foils and the spacing material profiled. The ion exchange membrane is then between the flat Side of the seal and a sealing flange of an electrolytic cell half trapped. This arrangement is particularly gentle on the mechanical sensitive ion exchange membrane when the electrolytic cell halves are used Formation of an electrolytic cell can be clamped together. On the other hand, must the seal is not necessarily flat on one side, but can also be profiled on both sides by the cords between the foils be, either both cords for profiling both sealing surfaces or each cord only for profiling one sealing surface can contribute.

The seal is thus in one piece and therefore easy to handle and assemble. The seal is fixed between the electrolytic cell halves in simple way via screw holes. The seal is flexible and therefore easy to transport by folding. You must during assembly not fixed to the sealing flange of the electrolytic cell halves with an adhesive so that cleaning of adhesive residues during remembraning is not necessary. Especially through the use of heat stable Glue eliminates the risk of leaking and later cleaning Avoid glue. The adhesive also acts as a diffusion barrier, thus preventing it corrosion due to substances passing through the membrane. The Corrosion is additionally reduced by using a spacer material Closed dead spaces and thus avoiding embrittlement of the membrane becomes.

Figur 1 eine Elektrolysezelle zur Chlorerzeugung;

Figur 2 eine Dichtungsanordnung gemäß dem Stand der Technik;

Figur 3 eine erfindungsgemäße Dichtungsanordnung im unverpressten Zustand;

Figur 4 eine erfindungsgemäße Dichtung gemäß einer ersten Ausführungsform;

Figur 5 eine erfindungsgemäße Dichtung gemäß einer zweiten Ausführungsform;

Figur 6 eine Doppelbandpresse zum Verschweißen von zwei Folien unter Einschluss einer Schnur;

Figur 7a, 7b das Ergebnis aus dem Schweißverfahren nach Figur 6 in Aufsicht und im Querschnitt; und

Figur 8 eine aus dem Schweißergebnis nach Figur 7a gebildete rahmenartige Anordnung zur Herstellung einer erfindungsgemäßen Dichtung unter Einsatz einer Ringschnur.

The invention is described below by way of example with reference to the accompanying drawings. In it show:

Figure 1 shows an electrolysis cell for chlorine production;

Figure 2 shows a sealing arrangement according to the prior art;

FIG. 3 shows a sealing arrangement according to the invention in the unpressed state;

Figure 4 shows a seal according to the invention according to a first embodiment;

Figure 5 shows a seal according to the invention according to a second embodiment;

FIG. 6 shows a double belt press for welding two foils together with a cord;

Figure 7a, 7b the result of the welding process according to Figure 6 in supervision and in cross section; and

8 shows a frame-like arrangement formed from the welding result according to FIG. 7a for the production of a seal according to the invention using an annular cord.

Figure 1 shows an electrolytic cell arrangement using the example of chlorine production from sodium chloride (NaCl). The electrolytic cell arrangement essentially consists of two housing halves 1, 2, between which an ion exchange membrane 5 is stretched. This creates a first space between the membrane 5 and the first housing half 1, in which a cathode 3 is arranged near the membrane 5, and a second space between the membrane 5 and the second housing half 2, in which an anode 4 is located near the membrane 5 is arranged. Water (H ₂ O) is flushed through the cathode compartment. There is a salt solution in the anode compartment, which is kept at a constant concentration level by adding NaCl. By applying a voltage between the cathode 3 and the anode 4, Na + ions diffuse through the ion exchange membrane 5 from the anode space into the cathode space. At the same time, molecular gaseous chlorine Cl ₂ is formed in the anode compartment. The Na + ions diffused into the cathode space lead to the formation of NaOH in water (sodium hydroxide solution) and to molecular, gaseous hydrogen H ₂ . The cathode compartment is constantly rinsed with fresh water H ₂ O.

The electrolytic cell formed by the housings 1 and 2 is through a seal 6 liquid-tight and gas-tight sealed from the outside to the environment.

FIG. 3 shows a seal 6 in the pre-assembled state according to a first embodiment between the flanges 1a, 2a of the cathode housing half 1 and the anode housing half 2, i.e. in an arrangement before the two housing halves 1, 2 are clamped together. The housing half 1 of the cathode 3 consists of a nickel sheet and the housing half 2 of the anode 4 consists made of a coated titanium sheet. Between the housing flange 1 a The cathode housing half 1 and the seal 6 becomes the ion exchange membrane 5 clamped. For this purpose, the seal 6 is on the ion exchange membrane 5 facing side. The seal 6 extends to the inner edge of the housing flanges 1a, 2a to make contact with the anode housing half 2 with the ion exchange membrane 5 and above a short circuit to exclude with the cathode housing 1. The seal consists in essentially of two spaced cords, the inner one Sealing cord 9 and the outer spacer cord 10 with a Diameter of, for example, 1.9 mm between two foils.

Screw the two housing halves 1 and 2 tight bores 7 and corresponding ones arranged around the electrolytic cell Tension bars led through and tightened. The seal 6 has therefore through holes 13 arranged congruently with the bores 7 between the two cords 9, 10. The distance between the housing flanges 1a and 2a is in the pre-assembly state shown in FIG. 3, for example at 2.6 mm. This corresponds to the thickness of the seal in the uncompressed Status. This distance is achieved by tightening the two halves of the housing 1 and 2 reduced to, for example, 1.1 mm (not shown). Consequently the thickness of the seal is reduced both in the area closer to the electrolytic cell space lying sealing cord 9 as well as in the area of the outside Spacer cord 10 accordingly by about 1.5 mm. The two thin foils, between which the two cords 9, 10 are received, contribute significantly to the overall compression of the seal of approx. 33%, since it compresses from 0.35 mm to 0.1 mm become.

Between the sealing cord 9 and the inner edge of the seal 6, the seal 6 is equipped with a spacer material 14. The spacer material 14 preferably covers this area over the entire surface. The thickness of the spacer material 14 is selected such that the ion exchange membrane 5, when the two housing halves 1 and 2 are in the tensioned state, preferably lies just against the housing flange 1a or is optionally pressed on with low pressure. This means that the distance between the spacer material 14 and the housing flange 2a is, in deviation from the pre-assembly state shown in FIG. 3, preferably approximately 1.5 mm. This corresponds to the path by which the two housing halves are displaced relative to one another when braced. The same material is preferably used as the spacer material 14 as for the foils, that is to say a foil material with a thickness of 0.35 mm.
When the two housing halves 1 and 2 are clamped, the spacer material 14 can, if necessary, also be compressed if it is namely thicker than 0.4 mm, as in the variant shown in FIG. 3. However, since the spacer material 14 essentially only has a stabilizing function for the ion exchange membrane 5 and not a sealing function, the spacer material 14 should in this case consist of a material that is substantially softer than the sealing cord 9.

With the spacer material 14 it is thus achieved that it is compressed State of the seal 6 a gap between the seal 6 and the electrolytic cell arrangement completely or at least essentially in the distance range fills in, without compressive force or in any case only an insignificant Share of the compression force.

In Figure 4, the seal 6 is again shown separately. Are easy to see on it the two-layer film structure consisting of the two films 8a and 8b, between which the sealing cord 9 and the spacer cord 10 are stored are. The seal 6 is flat on one side and has openings 13 through which tensioning screws can be passed through it. One of the two Films 8a, 8b are provided with a thermoplastic fluoropolymer layer 11, via which the two layers 8a, 8b together in the thermal welding process are firmly connected. The width of the seal 6 is e.g. 54 mm and is preferred adapted to the housing flange width 1a, 2a.

In the exemplary embodiment according to FIG. 4, the spacer material 14 rests the profiled outside of the seal 6 between the sealing cord 9 and the closest outer edge of the seal 6. The spacer material 14 can from a thermoplastic that can be welded to the adjacent film 8b Material exist or be coated with such a material to a Thermal welding connection between the spacer material 14 and the film 8b to be able to produce. A connection by means of a is also conceivable other thermally stable adhesive.

FIG. 5 shows an alternative embodiment in which the spacer material 14 lies between the two foils 8a, 8b. This can be cheaper from a procedural point of view his. If the sealing cord 9 only in a separate operation between the two foils 8a, 8b that are already in other areas of the seal can be brought pre-welded, then the spacer material 14 in the same operation together with the sealing cord 9 between bring the two foils 8a, 8b.

In particular, it is also conceivable that the seal in the area of the spacer material has only one film layer, film 8a or film 8b.

In FIGS. 4 and 5, the foils 8a, 8b of the seal 6 are two separate ones Slides shown. You can also use a single, double folded film can be formed. According to a particular embodiment of the Invention, the two films 8a, 8b can also be used in the co-extrusion process a single film with cords 9 and 10 enclosed between them become. The cords 9 and 10 are then not between two foils, but between two film surfaces. The spacer material 14 can Cross-sectional profile of the extruded film must already be taken into account. Finally it is even conceivable that instead of the two integrated in the extrudate Lines 9 and 10 the extrudate consists of a solid material, the Cords 9 and 10 only by appropriate thickening of the extrudate cross section are realized as cord-shaped sealing components.

The sealing cord 9 can consist of a wide variety of materials, for example also made of wire-like material such as a PVDF wire or a Welding wire.

However, the sealing cord 9 is preferably essentially one cord-like structure made of at least one spiral-rolled expanded polytetrafluoroethylene (ePTFE) film-like material. Such a seal is, for example, in DE 197 23 907 A1 by the applicant described. As explained therein, this seal can be placed over their Cord cross-section have a density gradient, which from the outside the second sealing component starting towards them Cross-sectional center increases. In particular, in the aforementioned Patent application described as a self-contained ring seal a cylindrical film rolled on itself can be produced. at Such a self-contained ring seal means fewer leakage problems because it has no inhomogeneous sealing joints. The ePT-FE material the ring seal 9 can also have a filler, such as glass, ceramic and / or polymer resin.

The material for the spacer cord 10 which - since it has no sealing function possesses in the narrower sense - does not have to be self-contained comparatively uncritical. It is particularly important that the sealing cord 9 and the spacer cord 10 in the operating state, that is, after any Set within the initial uptime, roughly the same compressed Own thickness. Otherwise, the housing flanges 1a, 2a could Bracing a wedge-shaped arrangement to each other and thereby cause the cords to wander. In extreme cases, this can lead to a leak lead the electrolytic cell arrangement. Therefore, it is preferred that the Sealing cord 9 and the spacer cord 10 in the unloaded state approximately have the same diameter and also preferably in have approximately the same modulus of elasticity, even if the two cords 9, 10 not necessarily consist of the same material for cost reasons need.

The two films 8a, 8b are preferably fluoropolymer films, especially films made of polytetrafluoroethylene, such as multidirectionally expanded polytetrafluoroethylene (ePTFE), at least one of the foils on one side with ethylene-fluoroethylene propylene (EFEP) or one other fluoropolymer is coated as a welding agent.

The following is a method for manufacturing the electrolytic cell seal described above explained. First, a frame-like arrangement for Provided, the two films 8a, 8b and the one in between Cord 10 with spacing function includes. This frame-shaped in the case of large series, arranged material can be processed in a single operation, for example in an autoclave. It should be noted, that an inner area of the two foils is not yet together is welded so that in a subsequent step the sealing cord 9 and possibly also the spacer material 14 between the two Layers 8a, 8b can be inserted, whereupon the cracks of the two foils 8a, 8b takes place in this area. It is also conceivable to seal all sealing components together in one operation weld.

However, if the frame-like arrangement is made by hand, this is done this is preferably done using a heated double belt press, as in FIG 6 shown. Two films 8a, 8b made of multidirectionally stretched polytetrafluoroethylene are made of supply rolls with a supply length of, for example Deducted 180 m and through a connecting station 15 in the form of a double belt press with heating elements arranged on both sides of the transport route 16 out. The spacer cord 10 is between the two foils 8a, 8b fed. Because of the thermoplastic coating at least one of the two foils 8a, 8b with ethylene-fluoroethylene propylene (EFEP) and the supply of heat through the heating elements 16, the two foils 8a, 8b weld together Area of the double belt press 15 including the spacer cord 10 with each other.

Figure 7a, 7b show the resulting product once in supervision and once in Cross-section. The foils 8a, 8b are in the connection station respectively Double belt press 15 not over the entire width but only over part of the width welded together by the EFEP coating 11. An EFEP coating is also in the rest of the area at least one of the two foils 8a, 8b is present. However, this area is next to of the connecting station 15. At the same time, the two Edges of the superimposed foils 8a, 8b are trimmed so that each two edges lie exactly on top of each other.

In order to ensure that the film composite is flat on one side (FIG. 7B), either divided the upper belt or the lower belt of the double belt press 15 in such a way that the spacer cord 10 along this division gap in one Is deepened.

Figure 8 now shows the frame-like arrangement consisting of four sections of the foil webs welded together. In the non-welded areas the film 8b lying at the top is folded up so that between the foils 8a, 8b are inserted a self-contained ring seal 9 can. The folded up sections of the foils 8b are then opened the ring seal 9 folded down. In the corner areas of the frame-like The films 8a, 8b are each arranged by a corner connecting film 18 underlaid to firmly adjoin adjacent film sections connect. A corresponding corner connection film 18 is on each corner of the frame-like arrangement also placed from above (not shown). The corner areas are then first, for example, by pulse welding welded together. Then the films 8a, 8b of the four foil webs in the previously unwelded areas Inclusion of the ring seal 9 welded together. For example by re-passing through a double belt press or a stationary heating press are carried out, with a profile for the sealing cord 9 is to be provided so that the resulting seal is flat on one side.

The spacer material 14, not shown in Figure 8, can either before Folding down the film 8b between the films 8a and 8b are inserted or then placed on the film 8b. In addition, supplementary pieces the spacer cord 10 are placed on the film 8b so the spacer cord 10 forms a closed ring. The spacer material 14 and the supplementary pieces of the spacer cord 10 are then integrated into the seal during the welding step described above. Finally there are holes (not shown) for the implementation punched into the seal by screws.

Claims (28)

Seal (6) for an electrolytic cell arrangement, comprising a first Foil surface and a second foil surface, and essentially one Spacer function, cord-shaped first sealing component (10) and essentially performing a sealing function, cord-shaped second sealing component (9) between the first film surface and the second film surface are spaced apart, the distance between the two sealing elements (9, 10) Is a multiple of its maximum thickness. The seal of claim 1, wherein the seal is for a particular Compression pressure is provided and the two sealing elements (9, 10) if they are each subjected to such compression pressure, have the same compressed thickness. Seal according to claim 1 or 2, wherein the two sealing elements (9, 10) have the same or at least approximately the same compressibility. Seal according to one of claims 1 to 3, wherein it is one in itself closed frame-shaped seal. Seal according to one of claims 1 to 4, wherein the first sealing component (10) a first cord and the second sealing component (9) one second cord is. Seal according to claim 5, wherein that of the two cords (9) which in use the seal (6) is closer to the electrolytic cell, from a spirally wound film. A seal according to claim 6, wherein the spiral wound film existing cord (9) is a self-contained ring cord, which is made of a cylindrical film rolled on itself is produced. Seal according to one of claims 1 to 7, wherein the first film surface from a first film (8a) and the second film surface from a second Foil (8b) is formed. Sealing for an electrolytic cell arrangement, in particular according to claim 8, comprising a first sealing component (10) taking over essentially a spacer function and a second sealing component (9) taking over essentially a sealing function, which side by side between a first film (8a) and a second film (8b) The circumferential direction of the seal (6) extends, characterized in that the two foils (8a, 8b) are connected to one another by an adhesive (11) which is stable up to 100 ° C. Seal according to claim 9, wherein the adhesive (11) is thermally activated. A seal according to claim 10, wherein the adhesive (11) is a thermoplastic Is glue. Seal according to one of claims 9 to 11, wherein the adhesive (11) on a fluoropolymer based adhesive. A seal as claimed in claim 12, wherein the adhesive (11) is ethylene-fluoroethylene propylene (EFEP). Seal according to one of claims 1 to 6, wherein the two film surfaces by one containing the cord-shaped sealing components (9, 10) extruded film are formed. Seal according to claim 14, wherein the sealing components (9, 10) between the film surfaces are included. Seal according to claim 14, wherein the extruded film extrudes as a solid material and the sealing components (9, 10) as thickening of the cross section the extruded film are realized. Gasket for an electrolytic cell arrangement, in particular according to one of claims 1 to 16, comprising a first sealing component (10) taking over essentially a spacer function and a second sealing component (9) taking over essentially a sealing function, which side by side in the circumferential direction between a first film surface and a second film surface Seal (6) extend, with at least one of the two film surfaces extending a bit beyond that of the two seal components (9), which in the case of use of the seal is closer to the electrolysis cell space, characterized in that a spacer material ( 14) is provided which, in the compressed state of the seal, completely or at least substantially fills a gap between the seal and the electrolytic cell arrangement in the extension area, without compression force or in any case only insignificantly ch absorb compression force. The seal of claim 17, wherein the spacer material (14) between the Foils (8a, 8b) lies. The seal of claim 17, wherein the spacer material (14) is on a The outside of the two foils (8a, 8b) of the seal (6) is present. Seal according to one of claims 1 to 19, wherein the film material in each case is multidirectionally expanded polytetrafluoroethylene (ePTFE). Seal according to one of claims 1 to 20, wherein the seal on one side flat and one-sided due to the running between the two foils (8a, 8b) Sealing components (9, 10) is profiled. Including electrolytic cell arrangement a cathode compartment with a first housing part (1) and a cathode (3), an anode compartment with a second housing part (2) and an anode (4), a separator (5) arranged between the first housing part (1) and the second housing part (2) and separating the anode space and the cathode space, and a seal (6) between the first housing part (1) or the second housing part (2) and the separator (5), wherein the seal (6) is a seal according to any one of claims 1 to 21. Method for producing a seal (6) for an electrolytic cell arrangement, comprising the steps: providing an at least two-layer material in a frame-like arrangement with a first cord (10) received between the material layers (8a, 8b), Arranging a second cord (9) circumferentially between the material layers (8a, 8b) of the frame-shaped material such that the distance between the first cord (10) and the second cord (9) is a multiple of its maximum diameter and the second cord (9) is closer to the center of the frame-shaped arrangement than the first cord (10), and Connecting the material layers (8a, 8b) including the cords (9,10) in such a way that a one-piece frame-shaped seal is created. The method of claim 23, comprising producing the at least two-layer frame-shaped material provided using the following steps: Inserting the first cord (10) between a first material layer (8a) and a second material layer (8b), Feeding the first material layer (8a) and the second material layer (8b) to a connection station (15), Connecting the first material layer (8a) to the second material layer (8b) including the first cord (10) in the connecting station (15), and Form a frame-shaped arrangement from the interconnected material layers (8a, 8b). The method of claim 24, wherein the at least two-layer is made Material is done in a continuous process. The method of claim 25, wherein the connection station (15) is a double belt press is. The method of claim 26, wherein the double belt press is heated in this way the first material layer (8a) with the second material layer (8b) welded. The method of claim 25 or 26, wherein the first cord (10) in the Connection station (15) is guided on one side in a recess, so that manufactured two-layer material is flat on one side and profiled on one side.

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