EP3688206A1 - Dispositif d'électrolyse - Google Patents

Dispositif d'électrolyse

Info

Publication number
EP3688206A1
EP3688206A1 EP18786231.3A EP18786231A EP3688206A1 EP 3688206 A1 EP3688206 A1 EP 3688206A1 EP 18786231 A EP18786231 A EP 18786231A EP 3688206 A1 EP3688206 A1 EP 3688206A1
Authority
EP
European Patent Office
Prior art keywords
webs
ribs
holes
recesses
electrolysis
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
EP18786231.3A
Other languages
German (de)
English (en)
Other versions
EP3688206B1 (fr
Inventor
Dmitri Donst
Philipp Hofmann
Dirk Hoormann
Gregor Damian POLCYN
Peter Woltering
Alessandro FIORUCCI
Federico Fulvio
Michele Perego
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.)
ThyssenKrupp Nucera AG and Co KGaA
Original Assignee
ThyssenKrupp Uhde Chlorine Engineers 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 ThyssenKrupp Uhde Chlorine Engineers GmbH filed Critical ThyssenKrupp Uhde Chlorine Engineers GmbH
Publication of EP3688206A1 publication Critical patent/EP3688206A1/fr
Application granted granted Critical
Publication of EP3688206B1 publication Critical patent/EP3688206B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/34—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis
    • C25B1/46—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis in diaphragm cells
    • 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
    • C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
    • C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
    • C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
    • 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
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • 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
    • C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
    • C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with 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 present invention relates to an electrolysis apparatus for the electrolytic treatment of liquids with an anode chamber and a cathode chamber, which are separated by an ion exchange membrane, wherein the chambers with an inlet opening and a discharge port for the flowing electrolyte and each equipped with an electrode and wherein the interior the anode chamber and / or the cathode chamber is subdivided by webs or ribs extending transversely to the electrodes, wherein the webs or ribs are provided at least in regions with holes or recesses.
  • Anolytehunt occurs by the buoyancy effect of the chlorine gas a certain natural mixing in the vertical direction.
  • the average flow velocity in the anolyte chamber in the horizontal direction is low and therefore the natural mixing in the horizontal direction is very low.
  • the rising in the electrolyte gas bubbles have the tendency to unite in the upper part to a closed foam layer.
  • EP 0,220,659 B1 describes a bipolar type electrolyzer comprising a plurality of bipolar unit cells arranged in series, each cell being composed of an anode-side trough-shaped body and a cathode-side trough-shaped body, each having a hook-shaped flange, a frame wall and a Include partition, wherein the anode and cathode are each welded to the partition via electrically conductive ribs (webs).
  • Each of these conductive fins is provided with holes spaced along its entire height to allow passage of the electrolyte and the product of electrolysis through the fins.
  • the membrane In electrolysis devices of the aforementioned type, the membrane is usually very close to the electrodes.
  • the ribs or webs extending between the electrodes and transversely to them divide the interior of the electrolysis device into a plurality of compartments (also referred to as compartments). If one uses massive ribs or webs, it may come to an insufficient brine supply of the membrane, which leads to the formation of blister formation on the membrane when using planar anodes.
  • mammoth pump effect refers to the phenomenon described by Carl Immanuel Löscher that gas bubbles introduced into a liquid below the liquid level allow the liquid level to be increased to a certain extent, and this effect is used in the so-called mammoth pumps for conveying liquids.
  • an electrode assembly for an electrolyzer of the filter press type is known in which anode spacers and cathode spacers are used, which extend in the transverse direction to the flat electrodes.
  • a Z-shaped spacer is also referred to as an upper spacer, while below it there are U-shaped or C-shaped spacers.
  • these Z-shaped or U-shaped spacers are arranged horizontally in the electrolytic cell, that is, they extend transversely to the height direction of the electrolysis cell.
  • the spacers have different sized circular or oval perforations. These perforations are used for the vertical mixing of the electrolyte, which is to be improved by the larger perforations, the gas flow of the ascending gas in the electrolyte.
  • a subdivision of the electrolytic cell in the longitudinal direction that is, in the direction of the longitudinal extension of the spacers is not provided here.
  • DE 199 54 247 Al an electrolytic cell with gas diffusion electrode is described, in which the cell is divided by horizontally extending webs into a plurality of superimposed spaces, so that the gas flows meandering through the gas space from bottom to top and thereby in each room flows horizontally.
  • a further subdivision of the electrolytic cell by vertically extending in the height direction webs is not provided here.
  • US 5,693,202 A also describes an electrochemical cell having an ion exchange membrane in which a lower inlet opening and an upper outlet opening are provided.
  • the cell extending in the transverse direction of the electrodes extending in the horizontal direction connecting elements which divide the cell into a plurality of superposed chambers and in which a plurality of regularly arranged openings is provided, which serve to allow the passage of gas in the height direction of the electrolytic cell.
  • the object of the present invention is to provide an electrolysis device with the features of the aforementioned type, in which on the one hand there is sufficient mixing in the longitudinal direction, but at the same time the mammoth pump effect is maintained.
  • the electrolysis cell has an extension in three mutually orthogonal spatial directions.
  • a longitudinal direction that spatial direction is defined in which the electrolytic cell usually has its greatest extent.
  • the flat electrodes extend in this longitudinal direction and in the height direction.
  • the transverse direction is herein called the direction of the normal to the surface of the electrodes. Gas bubbles rise in the electrolytic cell against gravity from bottom to top. This bottom-up direction is referred to herein as the height direction.
  • the conventional thorough mixing of the electrolyte in the vertical direction which is also present in the prior art, is referred to in the present application as vertical mixing.
  • This is to be distinguished from the mixing of the electrolyte in the longitudinal direction of the electrolytic cell, for the purpose of which the inventively provided vertical webs have holes or recesses through which the electrolyte can flow.
  • These webs thus run in the height direction of the electrolysis cell according to the above definition or substantially in the vertical direction, wherein they also extend in the transverse direction of the electrolysis cell, that is transverse to the flat electrodes.
  • a subdivision of the electrolytic cell in its longitudinal direction is created in several compartments by these webs.
  • the flow of the electrolyte through holes or Recesses in these webs is thus essentially a flow in the longitudinal direction of the electrolysis cell and is also referred to herein as horizontal mixing.
  • bottom and top refer to the extent of the electrolytic cell in the height direction.
  • an “upper” region in the height direction of the electrolysis cell, viewed higher, is located higher than a “lower” region.
  • the webs or ribs extend in the height direction of the electrolysis device and, seen in the height direction, have at least one lower region in which they are free of holes or recesses, that is to say that no holes or recesses are provided there.
  • the webs or ribs are solid and have no holes or recesses, there is the unimpeded mammoth pump effect guaranteed.
  • the gas bubbles produced during the electrolysis can rise without hindrance in the compartment of the electrolysis cell separated by the web. It dominates in this lower range, the vertical flow and there is no significant longitudinal mixing of the electrolysis medium.
  • In the upper region of the webs or ribs are inventively holes or recesses.
  • a foam phase of the electrolysis medium is formed by the ascending gas bubbles and therefore a longitudinal mixing is desired here.
  • This longitudinal mixing is achieved through the holes or recesses in the webs or ribs, which allow a flow through the electrolysis medium in the adjacent compartment of the electrolysis cell.
  • the direction in which the electrodes extend is understood in the present application as the longitudinal direction of the electrolyzer.
  • the lands or ribs extend substantially transversely of the electrolyzer, and preferably at approximately a right angle to the electrodes.
  • the two electrolysis chambers each have an approximately cuboid interior, which accommodates the electrolyte.
  • the webs or ribs thus run in the sense of the above definitions in the electrolytic cell substantially in the vertical direction and in the transverse direction.
  • the vertical mixing provided also in conventional electrolysis cells corresponds to a flow of the electrolyte substantially parallel to the webs or ribs, that is to say a flow in the vertical direction of the electrolysis cell in the individual compartments between two webs or ribs.
  • a flow of the electrolyte through the holes of a web takes place in a substantially horizontal flow, so that the electrolyte flows through holes in a web from one compartment into an adjacent compartment.
  • the longitudinal mixing thus takes place in a substantially horizontal flow direction, the is oriented substantially orthogonal to the vertical mixing in the vertical direction, that is orthogonal or at least transversely to the gas bubbles rising in the electrolyte.
  • holes is not intended to be limited to a particular contour shape, for example, the holes may have a round, oval, oblong, or angular outline
  • rejections includes, for one thing, through holes of any shape that are generally contiguous to the shape Material of a web are surrounded, as well as breakthroughs of the material, which allow passage of the electrolysis medium, but not all sides are surrounded by the material of a web, that is, they may also be optionally open at one or more points of its circumference.
  • the inventive design of the webs or ribs thus combines two effects in an advantageous manner.
  • optimum brine transport to the anode across the cell width is achieved through the holes or recesses in the webs in the upper foam phase.
  • the formation of blisters on the membrane is favored, which can be observed in particular during operation with permanently high current densities.
  • the webs or ribs have at least one upper region with holes or recesses, seen in the height direction of the electrolysis cell. Through these holes or recesses in the upper region of the webs or ribs there is a longitudinal mixing possible. There, due to the ascending gas bubbles, a foam phase forms, in the region of which longitudinal mixing of the electrolyte is advantageous.
  • the lower region in which the webs or ribs have no holes or recesses, extends at least approximately over the lower half of the entire height of the webs or ribs, in particular at least over the lower half of the entire height of the webs or ribs.
  • the end of the lower range depends on the individual conditions in the respective electrolysis cell. It can be determined empirically, for example, up to what height of the webs the mammoth pump effect is desired and a longitudinal mixing is to be prevented and at what level in each case the foam phase begins. Experiments have shown that it is generally advantageous, at least about the lower half of the webs or ribs, in particular at least the lower half of the webs or ribs, solid, d .h.
  • the area in which the holes start can thus in individual cases, for example in Depending on the parameters of the electrolytic cell, the type of electrolyte used in each case and the conditions in which electrolyzed, such as temperature, pH, current density, etc. vary.
  • the lower region, in which the webs or ribs have no holes or recesses extends at least approximately over the lower two thirds, in particular over the lower two thirds, of the entire height of the webs or ribs.
  • the region in which the webs or ribs are solid extends beyond the middle of the webs or ribs to the top, while only approximately in the upper third, especially in the upper third, where the foam phase forms , Holes or recesses are provided.
  • the upper area, in which the webs or ribs have holes or recesses extends at least approximately over the upper quarter, in particular over the upper quarter, of the entire height of the webs or ribs.
  • the region in which the webs or ribs are of solid construction thus extends further upwards, whereas holes or recesses are provided at least approximately in the upper quarter, in particular in the upper quarter, where the foam phase is formed are .
  • the upper region in which the webs or ribs have holes or recesses extends at least approximately over the upper third of the total height of the webs or ribs, in particular at least over the upper third of the total height of the webs or ribs.
  • a preferred development of the invention provides that the webs or ribs in the at least one upper region have a plurality of holes or recesses spaced apart from one another by massive regions in the height direction of the webs or ribs.
  • a further preferred embodiment of the device according to the invention provides that the webs or ribs in the at least one upper region in the outline at least partially have approximately round holes.
  • the shape of a keyhole may be mentioned here.
  • any other outline shapes for the holes or recesses are conceivable. It may, for example, holes or recesses are provided with different outline shapes and in different sizes, for example, depending on how much the effect of longitudinal mixing is desired and how much volume of electrolyte per unit time to flow through the holes or recesses each in the adjacent compartment.
  • a further preferred development of the invention provides that the webs or ribs in the at least one upper region have a plurality of holes or recesses which, viewed in the direction of the height of the webs or ribs, have different distances from each other.
  • This offers a further possibility to vary the effect of mixing in the longitudinal direction, by using holes or recesses of approximately the same size, whose distances but varies with each other over the height of the webs or ribs, so that in densely arranged holes or recesses larger total areas are given to holes per unit area of the webs.
  • the holes or recesses in the ridges or ribs in a first lower portion of the upper portion may be spaced closer together than in a second portion of the upper portion adjoining thereupon.
  • the holes or recesses have a certain minimum size in order to achieve the desired effect of thorough mixing.
  • the free cross-section of at least one hole or recess is at least about 10 mm 2 , more preferably at least about 15 mm 2 .
  • the free cross-section of all holes or recesses total at least about 300 mm 2 and the individual holes have the aforementioned minimum cross-sections, and this also depends on how many holes or recesses are provided in total and which distance they each have with each other.
  • the present invention furthermore relates to a process for the electrolytic treatment of a flowable medium in an electrolysis apparatus having the features of one of claims 1 to 10.
  • the process according to the invention preferably comprises a chloralkali electrolysis. Electrolysers of the type described herein are particularly suitable for chloralkali electrolysis. However, the electrolysis devices according to the invention can also be used for other electrolysis processes.
  • Figure 1 is a schematically simplified view of a cross section through an exemplary electrolysis device according to the invention according to a first embodiment
  • FIG. 2 shows a view of an exemplary electrolysis device according to the invention
  • Figure 3 is a sectional view in the longitudinal direction of the electrolysis apparatus shown in Figure 2;
  • Figure 4 is a sectional view in the transverse direction of the electrolysis apparatus shown in Figure 2;
  • Figure 5 is a detailed view of a single ridge with the holes for the longitudinal mixing of the electrolyte.
  • an electrolytic cell 10 each comprises a housing with two half shells, namely a cathode half-shell 11 and an anode half-shell 12, which are respectively provided at the top and bottom with flange-like edges, between which by means of seals in each case a membrane 13 is clamped.
  • This membrane 13 forms a partition wall between the cathode half-shell 11 (corresponding to the cathode chamber or catholyte chamber) and the anode half-shell 12 (corresponding to the anode chamber or anolyte chamber).
  • cathode half-shell 11 and anode half-shell are connected to one another above and below via transversely oriented screws 14 to form an electrolytic cell 10.
  • an inlet manifold 15, 16 for electrolyte solution and spent electrolyte is discharged via an outlet pipe 17 from the electrolysis cell.
  • Anode and cathode each extend close to the membrane surface in the vertical direction in the respective half-shell.
  • an obliquely oriented guide plate 18 is provided in the upper region in the anode half-shell, so that gas-laden liquid rises in the direction of the arrows on the side of this guide plate facing the anode, and the less or not at all on the rear side of the guide plate gas-laden liquid sinks.
  • This circulation compensates for the difference in concentration of electrolyte (for example NaCl) between feed and liquid in the cell.
  • FIG. 2 shows the peripheral frame 19, in the region of which the flange-like edges of the two half-shells are connected to one another are bolted.
  • FIG 3 the electrolytic cell shown in Figure 2 is shown cut longitudinally.
  • the rear space of the two electrodes in both half-shells is subdivided into individual compartments by webs 20 running approximately in the vertical direction and in the transverse direction. These webs also serve to stiffen and support the cathode and anode.
  • the cross-sectional view of Figure 4 can be seen in the drawing left one of these webs 20 well. It can be seen that the web 20 is provided in the upper region with holes 24, via which there is a longitudinal mixing of the electrolyte. Further details regarding the design and function of these webs 20 will be explained in more detail with reference to the individual part drawing of FIG 5.
  • FIG. 5 shows a single web 20, which is cut obliquely in its lower end region 21 and extends continuously in width only at the end rejuvenated. Viewed in the direction of its height, this web 20 has, in principle, two differently formed regions, namely a lower region 22 and an upper region 23.
  • the lower region 22 is solid, no holes or recesses being provided therein. In the exemplary embodiment according to FIG. 5, this lower region 22 extends over slightly more than the lower two-thirds of the overall height of the web 20.
  • the upper region 23 of the web 20 adjoins the lower region 22 at the top, the web 20 in FIG this upper region 23 is provided with holes 24, through which electrolyte can pass in the longitudinal direction of the electrolytic cell, so that longitudinal mixing of the electrolyte takes place in this upper region 23.
  • a number of a plurality of spaced-apart holes 24 are provided.
  • five such holes 24 are shown by way of example. It can be seen further that the two lower holes 24 a seen at the level of the web 20 have a smaller distance from each other than the upper holes.
  • the number of holes 24 and their respective distances between them can be varied virtually as desired in the context of the present invention.

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

Abstract

La présente invention concerne un dispositif d'électrolyse destiné au traitement électrolytique de liquides, comprenant un compartiment anodique et un compartiment cathodique, qui sont séparés l'un de l'autre au moyen d'une membrane échangeuse d'ions, les compartiments étant dotés d'une ouverture d'entrée et d'une ouverture de sortie servant aux flux d'électrolytes et étant chacun doté d'une électrode, l'intérieur du compartiment anodique et/ou du compartiment cathodique étant divisé par des ponts (20) ou des nervures s'étendant transversalement aux électrodes, les ponts ou les nervures étant pourvus, au moins dans certaines zones, de trous (24) ou de cavités, les ponts (20) ou les nervures selon l'invention comportant au moins une zone inférieure (22) ne possédant aucun trou (24) ni cavité. Selon l'invention, le dispositif d'électrolyse est avantageux en ce que, d'une part, dans la phase de mousse supérieure, un mélange suffisant est présent dans la direction longitudinale, et en ce que, d'autre part, l'effet de pompe mammouth est maintenu dans la zone inférieure par les bulles de gaz ascendantes.
EP18786231.3A 2017-09-29 2018-09-27 Dispositif d'électrolyse Active EP3688206B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017217361.0A DE102017217361A1 (de) 2017-09-29 2017-09-29 Elektrolysevorrichtung
PCT/EP2018/076205 WO2019063659A1 (fr) 2017-09-29 2018-09-27 Dispositif d'électrolyse

Publications (2)

Publication Number Publication Date
EP3688206A1 true EP3688206A1 (fr) 2020-08-05
EP3688206B1 EP3688206B1 (fr) 2021-08-04

Family

ID=63857869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18786231.3A Active EP3688206B1 (fr) 2017-09-29 2018-09-27 Dispositif d'électrolyse

Country Status (10)

Country Link
US (2) US11608561B2 (fr)
EP (1) EP3688206B1 (fr)
JP (1) JP7055864B2 (fr)
KR (1) KR102376799B1 (fr)
CN (1) CN111279017B (fr)
CA (1) CA3074795C (fr)
DE (1) DE102017217361A1 (fr)
EA (1) EA038689B1 (fr)
TW (1) TWI686511B (fr)
WO (1) WO2019063659A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4234761A1 (fr) 2022-02-25 2023-08-30 thyssenkrupp nucera AG & Co. KGaA Cellule d'électrolyse
EP4375555A1 (fr) 2022-11-24 2024-05-29 thyssenkrupp nucera AG & Co. KGaA Tube de raccordement, système d'électrolyse et procédé de raccordement
EP4375556A1 (fr) 2022-11-28 2024-05-29 Fluor Tubing B.V. Tube pour cellule d'électrolyse ou d'hydrolyse

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Also Published As

Publication number Publication date
KR102376799B1 (ko) 2022-03-18
DE102017217361A1 (de) 2019-04-04
TWI686511B (zh) 2020-03-01
JP2020535314A (ja) 2020-12-03
EP3688206B1 (fr) 2021-08-04
US11608561B2 (en) 2023-03-21
WO2019063659A1 (fr) 2019-04-04
JP7055864B2 (ja) 2022-04-18
CA3074795A1 (fr) 2019-04-04
TW201920772A (zh) 2019-06-01
CN111279017B (zh) 2022-04-15
EA202090574A1 (ru) 2020-05-27
CA3074795C (fr) 2021-10-26
KR20200080230A (ko) 2020-07-06
US20230220563A1 (en) 2023-07-13
US20200283919A1 (en) 2020-09-10
CN111279017A (zh) 2020-06-12
EA038689B1 (ru) 2021-10-05

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