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
  • C25B9/17—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
  • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
  • C25B11/02—Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form
  • C25B11/03—Electrodes; Manufacture thereof not otherwise provided for characterised by shape or form perforated or foraminous

Definitions

• the invention relates to an electrochemical half element for the electrochemical production of chlorine from aqueous solutions of alkali metal chloride.
• the gas pockets are individually designed to be removable from the half-shell housing of the half cell. This has the disadvantage that when all components of a half cell are replaced, for example when converting, all components, in particular the gas pockets with their gas feeds and gas discharges, have to be individually dismantled and reassembled. This leads to unnecessarily long downtimes for the electrolyzer.
• the object of the invention is to produce an electrochemical half cell
• the electrochemical half cell has an electrode space for receiving an electrolyte. Furthermore, the electrochemical half cell has a plurality of gas pockets, the gas pockets being separated from the electrode space by at least one gas diffusion electrode. Possibly. can also have one for each gas bag
• Gas diffusion electrode may be provided.
• the at least two Gas pockets are carried by a common carrier element which is in full contact with the rear wall of the gas pockets and / or forms the rear wall of the gas pockets.
• the support element according to the invention separates the electrode space between the gas diffusion electrode and the ion exchange membrane from the rear space in the half cell, the electrode space and the rear space being connected to one another via one or more openings in the support element.
• the advantage of the invention is that the carrier element forms a module with the gas pockets, which is inserted into the half-shell housing of the half cell and connected to it, in particular by welding. Connecting the
• the carrier element is an electrically conductive plate, preferably made of nickel or a nickel alloy. It is also conceivable to use a frame-shaped carrier element, which, however, compared to a plattenfb 'shaped support member aufwiese a lower mechanical stability and thus would be less advantageous.
• the carrier element according to the invention preferably forms the rear wall of the
• gas pockets are completely independent of the carrier element and are detachably connected to the carrier element in such a way that individual gas pockets or a plurality of gas pockets can be separated from the carrier element or can be removed therefrom.
• the carrier element is designed like a trough, so that the carrier element completely receives the gas pockets.
• the side walls of the carrier element particularly preferably have an edge which lies loosely on the edge of the half-shell of the electrochemical half-cell.
• the carrier element is connected to a housing, in particular in an electrically conductive manner, via one or more support elements.
• Trapezoidal or Z-profiles which are attached to the rear wall of the half-shell, serve as supporting elements.
• 1 is a schematic longitudinal section of an electrochemical half cell
• FIG. 2 shows a schematic cross section of the half cell shown in FIG. 1,
• FIG. 3 shows a schematic detail from a first embodiment of a carrier element arranged in a housing
• FIG. 4 shows a schematic detail from a second embodiment of a carrier element arranged in a housing
• FIG. 5 shows a schematic detail from a third embodiment of a carrier element arranged in a housing
• Fig. 6 is a schematic detail in a perspective view of the in
• Fig. 5 illustrated embodiment
• FIG. 7 shows a schematic section from a fourth embodiment of a carrier element arranged in a housing.
• the gas space can be divided into two or more gas pockets 26, 27, 28, 29 lying one above the other in a cascade manner (FIGS. 1 and 2).
• the gas pockets 26, 27, 28, 29 are usually separated from one another and open towards the bottom of the electrolyte.
• the gas from the gas pockets 26, 27, 28, 29 passes through outlet openings 10 into the rear space of the half-element 18 located behind the gas pocket 26, 27, 28, 29.
• the pressure in the gas pocket 26, 27, 28, 29 is thus increased via the Outlet openings 10 to the electrolyte kept in equilibrium with the pressure of the liquid column of the electrolytes in the corresponding part of the electrode space 17 lying between the gas diffusion electrode 5 and the ion exchanger membrane 4.
• the gas supply or removal of the respective gas pocket 26, 27, 28, 29 takes place via the gas inlet openings 9 or outlet openings 10.
• the gas supply to the bottom gas pocket 26 can take place, for example, directly via a nozzle or an in
• the gas passes from the lowest gas pocket 26 via the outlet openings 10 into the
• the gas is extracted from a gas collecting device, e.g. from a gas bell 7, collected and passed through the gas inlet opening 9 into the gas pocket 27 above. From this, the gas also comes again out of gas outlet openings 10 and a gas bell 7 into the gas pocket 28 lying above it.
• the gas bells 7 are arranged on an outside of a trough-shaped support element 2 according to the invention.
• the electrolyte is e.g. introduced by means of a distributor pipe 11 in the half element on the floor and then flows upwards in the half element.
• the electrolyte also reaches the electrode space 17 through a compensating opening 13
• the gas diffusion electrodes 5 are electrically conductive, for example on webs 16, connected to the half-shell 1. As described in DE-A-196 22 744, for example, this should be done with low resistance.
• One of the possible design variants of this low-resistance connection is described in EP-A-1 041 176 and can be done, for example, using laser welding technology.
• FIG. 3 A first embodiment is shown in FIG. 3.
• a plate inserted into the half-shell and connected to the half-shell on the side walls of the half-shell, for example by welding, from the carrier element 2.
• the plate is connected to the half-shell 1 via support elements 21.
• FIG. 4 Another alternative is shown in FIG. 4.
• the trough-shaped support element 2 can, as shown in FIG. 4, be installed in the half-shell 1.
• the trough or the support element 2 is firmly connected to the half-shell 1 via trapezoidal or Z-profiles as a support element 21.
• the connection can be established using common types of contact, e.g. Welded or soldered connections are made.
• the tub 2 is also connected to the half-shell 1 on its side walls. On the outside 19 of the rear wall 20 of the tub 2, the gas measuring devices 7 as well as gas supply and gas outlet openings can be attached in the rear space.
• the trough can particularly preferably, as shown in FIGS. 5 and 6, be installed such that it lies loosely on an edge 23 of the half-shell 1 and is connected to the half-shell 1 via the support elements 21.
• the connection should be made with low resistance. This can e.g. B. done by welding, soldering or clamp connections.
• the gas pockets 26, 27, 28, 29 are sealed off from the rear space of the half-shell 1 by means of the seal 3, which seals the half-shell 1 with the ion exchange membrane 4.
• FIG. 7 Another embodiment variant is shown in FIG. 7.
• the space behind the tub 2 is surrounded by its own half-shell sheet metal construction 22, which serves as a support element, so that the gas collection devices and electrolyte supply and distribution and gas / electrolyte discharge from the half-shell are installed therein.
• the support element 22 is, for example, via a weld seam 25 and via webs 24 with the . serving as a support element 2 connected part.

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)
• Fuel Cell (AREA)
• Hybrid Cells (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7703440

Family Applications (1)

Country Status (11)

Family Cites Families (7)

• 2001
  • 2001-10-23 DE DE10152276A patent/DE10152276A1/de not_active Withdrawn
• 2002
  • 2002-10-11 PL PL02368716A patent/PL368716A1/xx not_active Application Discontinuation
  • 2002-10-11 HU HU0401581A patent/HUP0401581A3/hu unknown
  • 2002-10-11 AU AU2002340551A patent/AU2002340551A1/en not_active Abandoned
  • 2002-10-11 WO PCT/EP2002/011404 patent/WO2003035935A2/de active Application Filing
  • 2002-10-11 BR BR0213448-9A patent/BR0213448A/pt not_active IP Right Cessation
  • 2002-10-11 EP EP02774701A patent/EP1440184A2/de not_active Withdrawn
  • 2002-10-11 JP JP2003538429A patent/JP2005506453A/ja active Pending
  • 2002-10-11 US US10/493,440 patent/US20040251127A1/en not_active Abandoned
  • 2002-10-11 CN CNB028208706A patent/CN1327034C/zh not_active Expired - Fee Related
  • 2002-10-11 KR KR10-2004-7005928A patent/KR20040062576A/ko not_active Application Discontinuation

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events