EP4053307A1 - Electrolysis cell, electrolysis device for chlor-alkali electrolysis and use of an electrolysis cell for chlor-alkali electrolysis - Google Patents

Electrolysis cell, electrolysis device for chlor-alkali electrolysis and use of an electrolysis cell for chlor-alkali electrolysis Download PDF

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Publication number
EP4053307A1
EP4053307A1 EP21159816.4A EP21159816A EP4053307A1 EP 4053307 A1 EP4053307 A1 EP 4053307A1 EP 21159816 A EP21159816 A EP 21159816A EP 4053307 A1 EP4053307 A1 EP 4053307A1
Authority
EP
European Patent Office
Prior art keywords
electrolysis
electrolytic solution
anode
electrolysis cell
anode chamber
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.)
Withdrawn
Application number
EP21159816.4A
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German (de)
English (en)
French (fr)
Inventor
Koji KAWANASHI
Takehiro Oiwa
Masaki Watanabe
Peter Toros
Fulvio Federico
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 Nucera AG and Co KGaA
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 Nucera AG and Co KGaA filed Critical ThyssenKrupp Nucera AG and Co KGaA
Priority to EP21159816.4A priority Critical patent/EP4053307A1/en
Priority to JP2023549076A priority patent/JP2024507353A/ja
Priority to PCT/EP2022/054033 priority patent/WO2022184467A1/en
Priority to BR112023017493A priority patent/BR112023017493A2/pt
Priority to US18/279,830 priority patent/US20240133055A1/en
Priority to EP22706810.3A priority patent/EP4301902A1/en
Priority to CA3196773A priority patent/CA3196773A1/en
Priority to CN202280008339.9A priority patent/CN116635574A/zh
Priority to KR1020237019937A priority patent/KR20230104964A/ko
Publication of EP4053307A1 publication Critical patent/EP4053307A1/en
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • 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
    • C25B9/60—Constructional parts of 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
    • C25B9/70—Assemblies comprising two or more 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
    • C25B9/70—Assemblies comprising two or more cells
    • C25B9/73—Assemblies comprising two or more cells of the filter-press type
    • C25B9/75—Assemblies comprising two or more cells of the filter-press type having bipolar electrodes
    • 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

Definitions

  • the present invention relates to an electrolysis cell and an electrolysis device for chlor-alkali electrolysis as well as the use thereof for chlor-alkali electrolysis.
  • the chlor-alkali electrolysis is a process for producing chlorine gas, hydrogen and hydroxide gas from aqueous alkali chloride solution using electrical energy and an electrolysis cell.
  • sodium or potassium chloride is used as alkali chloride.
  • the reaction equation for the electrolysis of aqueous sodium chloride is: 2 NaCl + 2 H 2 O ⁇ Cl 2 + H 2 + 2 NaOH
  • electrolytic solution is consumed on the electrode surface and gas is produced on the electrode surface.
  • the density, the temperature, and the composition of the electrolytic solution changes on the surface of the electrodes and air bubbles are generated on the electrodes' surfaces. Air bubbles or an inhomogeneous distribution of electrolyte, density, and temperature in the electrolytic solution are detrimental to a stable and efficient electrolysis process.
  • US 6,503,377 B1 also aims at removing gas bubbles from the electrodes at a higher rate.
  • the electrodes have been specifically shaped in order to accumulate and drive away the produced gas bubbles. This effects a circulation around the surface of the electrodes.
  • the present invention has been made in the light of this problem and aims at improving homogeneity of the electrolytic solution in order to improve stability and efficiency of the electrolysis process.
  • an electrolysis cell for chlor-alkali electrolysis comprising an anode chamber for accommodating an anode and for accommodating an electrolytic solution characterized in that the anode chamber comprises a circulation structure for improving circulation of the electrolytic solution and at least one baffle plate for improving homogeneity of the electrolytic solution, preferably for improving horizontal homogeneity of the electrolytic solution.
  • the circulation structure and the at least one baffle plate are different structures.
  • the inventors have found that the use of these structures improves the homogeneity of the electrolytic solution with regard to the concentration of chemical molecules within the electrolytic solution in an unexpected way.
  • the demonstrated effect can also be assumed for the homogeneity of the density and temperature within the electrolytic solution.
  • the electrolytic solution may be denoted as anolyte solution.
  • the electrolytic solution preferably comprises aqueous sodium chloride or aqueous potassium chloride.
  • the electrolytic solution preferably comprises water and 100 to 400 g/L, more preferably 150 to 300 g/L, even more preferably 180 to 280 g/L of sodium chloride or potassium chloride.
  • the anode chamber comprises the electrolytic solution.
  • homogeneity of the electrolytic solution means that density and/or temperature and/or the concentration of sodium chloride and/or potassium chloride in the electrolytic solution is even or similar at different locations within the anode chamber.
  • the term “improving homogeneity of the electrolytic solution” means that density and/or temperature and/or the concentration of sodium chloride and/or potassium chloride in the electrolytic solution is made more even or similar at different locations within the anode chamber.
  • the term “improving homogeneity of the electrolytic solution” means that density and/or temperature and/or the concentration of sodium chloride and/or potassium chloride in the electrolytic solution is approximated/aligned/brought into line/equaled at different locations within the anode chamber.
  • the term “improving horizontal homogeneity of the electrolytic solution” means that density and/or temperature and/or the concentration of sodium chloride and/or potassium chloride in the electrolytic solution is made more even or similar at different locations within the anode chamber, wherein the electrolytic solution is considered as a stack of horizontal layers, wherein the density and/or temperature and/or the concentration of sodium chloride and/or potassium chloride in the electrolytic solution is made more even or similar within at least one horizontal layer.
  • this at least one horizontal layer is at the bottom end (in the direction of the center of gravity) of the anode chamber and/or close to an inlet of the anode chamber.
  • similar density and/or temperature and/or concentration of sodium chloride and/or potassium chloride in the electrolytic solution means a maximal difference of 5, 10, 15, 20, 25, 30, or 35 % across different locations within the anode chamber and/or within the horizontal layer.
  • the anode chamber comprises an anode.
  • the anode is arranged essentially vertically within the anode chamber.
  • the anode chamber has the longest dimension/expansiveness in the vertical direction.
  • the anode may be one single structural element or comprise several structural elements.
  • the anode may have the form of a mesh.
  • the electrolysis cell for chlor-alkali electrolysis may comprise further elements, which are known to the person skilled in the art and which are helpful for conducting chlor-alkali electrolysis.
  • Such an element is for example a cathode chamber for accommodating a cathode and for accommodating catholyte solution.
  • the electrolysis cell comprises a cathode chamber for accommodating a cathode and for accommodating catholyte.
  • the cathode chamber comprises a cathode and catholyte.
  • the cathode may be one single structural element or comprise several structural elements.
  • the cathode may have the form of a mesh.
  • the anode chamber and cathode chamber are separated by an ion-exchange membrane.
  • the membrane is semi-permeable.
  • the membrane preferably allows exchange of sodium and/or potassium ions between anode chamber and cathode chamber.
  • the electrolysis cell preferably comprises an ion-exchange membrane.
  • circulation structure As a result of the circulation structure, circulation of the electrolytic solution is improved within the anode chamber. However, the improved circulation is also helpful for a cathode reaction, since flux of alkali across an ion-exchange membrane is increased.
  • the electrolysis cell may further comprise elements known to the person skilled in the art such as a gas and liquid separator, a current distributor, inlets, product outlets etc.
  • the anode chamber may have at least one inlet for a stream comprising water and 150 to 450 g/L, preferably 200 to 400 g/L, more preferably 250 to 350 g/L, most preferably about 300 g/L, of sodium chloride and/or potassium chloride.
  • the anode chamber may have one product outlet for chlorine gas, preferably at the top end of the anode chamber (away from the center of gravity). Further, the anode chamber may have one outlet for a stream comprising aqueous sodium chloride and/or potassium chloride.
  • the anode chamber has a top end (away from the center of gravity) and a bottom end (in the direction of the center of gravity).
  • the electrolysis cell may be a zero-gap cell.
  • the circulation structure is a structure for effecting circulation of the electrolytic solution around the circulation structure.
  • the circulation of the electrolytic solution around the circulation structure is in the form of a loop. This allows increasing homogeneity in the entire anode chamber, if the circulation structure is correspondingly designed.
  • the circulation structure is a structure for effecting essentially vertical circulation of the electrolytic solution.
  • the anode in the anode chamber generates chlorine gas bubbles from the electrolytic solution. These gas bubbles have a lower density than the surrounding electrolytic solution and stream to the top end of the anode chamber (away from the center of gravity). The rising gas bubbles drag further electrolytic solution from lower parts of the anode chamber.
  • This "gas lift effect" is made use of in the present invention. Arranging a circulation structure adjacent to a section of the anode results in that the gas lift effect creates a high degree of vertical circulation. A high degree of circulation allows mixing of the electrolytic solution and improves homogeneity of the electrolytic solution. Therefore, the circulation structure is preferably a structure for improving vertical homogeneity of the electrolytic solution.
  • the term "improving vertical homogeneity of the electrolytic solution” means that density and/or temperature and/or the concentration of sodium chloride and/or potassium chloride in the electrolytic solution is made more even or similar across different vertical locations within the anode chamber.
  • the circulation structure forms at least one downcomer within the anode chamber.
  • the term "downcomer” shall denote an at least partly delimited region of the anode chamber that extends in a vertical direction and is open at its top and at its bottom end. More preferably, the circulation structure forms a plurality of downcomers within the anode chamber. The shape of a downcomer allows a particularly good vertical circulation for improving vertical homogeneity.
  • the circulation structure and/or the at least one downcomer is arranged essentially in parallel to the anode.
  • the electrolysis cell does not comprise an anode (e.g. before assembly)
  • the circulation structure and/or the at least one downcomer is arranged essentially in parallel to the space intended for the anode.
  • the circulation structure and/or the at least one downcomer divides the anode chamber into an upflow section and a downflow section, each comprising electrolytic solution.
  • the upflow section is characterized by gas bubbles streaming from the anode to the top end of the anode chamber (away from the center of gravity).
  • the upflow section is arranged between the anode and the circulation structure and/or the at least one downcomer.
  • the upflow section is arranged between a surface of the circulation structure and/or the at least one downcomer facing the anode and the anode. Further, the downflow section is arranged on the side of the surface of the circulation structure and/or the downcomer facing away from the anode.
  • the ratio of the cross section of the upflow section to the cross section of the downflow section is 1 or less than 1, preferably 0.8 to 0.3, more preferably 0.6 to 0.4, most preferably about 0.43. This ratio allows a particular homogenous electrolytic solution.
  • the cross section of the upflow section plus the cross section of the downflow section is 5 to 100 cm 2 , more preferably 7 to 50 cm 2 .
  • the at least one downcomer has/forms a V-shape (from top view). In another embodiment, the at least one downcomer has/forms the shape of a trough (from top view). In another embodiment, the at least one downcomer has/forms the shape of one half of a regular hexagon (from top view).
  • the above shapes allow excellent circulation.
  • a/the peak of the V points towards the anode.
  • the trough is open towards the anode.
  • the anode and/or the circulation structure and/or the at least one downcomer extend along a height section of the anode chamber.
  • the circulation structure and/or the at least one downcomer has a height of 50 to 100 %, preferably of 60 to 98 %, more preferably of 70 to 96 %, of the height of the anode.
  • This height allows a particular homogenous electrolytic solution.
  • 92 to 99 % are preferred, and 93 to 98 % are even more preferred.
  • 60 to 85 % are preferred, and 65 to 80 % are even more preferred.
  • the circulation structure and/or the at least one downcomer extends along 50 to 100 %, preferably 60 to 98 %, more preferably 70 to 96 %, of the height of the anode.
  • This height allows a particular homogenous electrolytic solution.
  • 92 to 99 % are preferred, and 93 to 98 % are even more preferred.
  • 60 to 85 % are preferred, and 65 to 80 % are even more preferred.
  • the anode has a length of 100 to 160 cm, more preferably of 120 to 140 cm.
  • the circulation structure and/or the at least one downcomer has a length of 50 to 160 cm, more preferably of 60 to 140 cm.
  • the circulation structure and/or the at least one downcomer is a structure for (mechanically) supporting the anode.
  • the circulation structure and/or the at least one downcomer (mechanically) supports the anode, in particular against pressure from the cathode chamber.
  • one baffle plate is preferred.
  • the at least one baffle plate is arranged horizontally or essentially horizontally.
  • the term “essentially horizontally” means “horizontal” or “with a slope smaller than 45, 30, 20, 10, or 5 ° compared to a horizontal line”.
  • a horizontal baffle plate is particularly useful for improving homogeneity in combination with the vertical circulation effected by the circulation structure.
  • each baffle plate has a length of 10 to 235 cm, preferably of 26 to 235 cm, and/or a width of 5 to 20 cm, preferably of 7 to 15 cm.
  • the baffle plate is horizontal and/or plane.
  • the baffle plate may have perforations for causing perturbations, which improves homogeneity of the electrolytic solution in the anode chamber.
  • the at least one baffle plate is arranged such that a stream from at least one inlet of the anode chamber collides with the baffle plate.
  • a stream from at least one inlet of the anode chamber is directed to the baffle plate.
  • the at least one inlet of the anode chamber is at the bottom end (in the direction of the center of gravity) of the anode chamber.
  • the stream comprises water and 150 to 450 g/L, preferably 200 to 400 g/L, more preferably 250 to 350 g/L, most preferably about 300 g/L, of sodium chloride and/or potassium chloride.
  • the baffle plate causes perturbations, which improves mixing with the electrolytic solution in the anode chamber and improves homogeneity of the electrolytic solution in the anode chamber.
  • the at least one baffle plate is arranged such that a stream of electrolytic solution from the circulation structure and/or the at least one downcomer (i.e. from the downflow section) collides with the baffle plate.
  • a stream of electrolytic solution from the circulation structure and/or the at least one downcomer i.e. from the downflow section
  • This improves homogeneity of the electrolytic solution in the anode chamber.
  • the at least one baffle plate is arranged such that a stream from at least one inlet of the anode chamber collides with the baffle plate and a stream of electrolytic solution from the circulation structure and/or the at least one downcomer (i.e. from the downflow section) collides with the baffle plate.
  • This embodiment particularly improves mixing of the electrolytic solution in the anode chamber and improves homogeneity of the electrolytic solution in the anode chamber.
  • the stream from at least one inlet of the anode chamber collides with a bottom surface of the at least one baffle plate and a stream of electrolytic solution from a bottom end of the circulation structure and/or the at least one downcomer (i.e. from the downflow section) collides with a top surface of the baffle plate.
  • the at least one inlet of the anode chamber is at the bottom end (in the direction of the center of gravity) of the anode chamber.
  • the invention is directed to an electrolysis device for chlor-alkali electrolysis, comprising at least one electrolysis cell according to the invention.
  • electrolysis device Such an electrolysis device may be denoted as electrolyzer.
  • the electrolysis device comprises a plurality of electrolysis cells according to the invention.
  • the electrolysis device may be a filter press electrolyzer and/or a bipolar ion-exchange membrane process electrolyzer.
  • the electrolysis device for chlor-alkali electrolysis may comprise further elements, which are known to the person skilled in the art and which are helpful for conducting chlor-alkali electrolysis.
  • the invention is directed to the use of an electrolysis cell according to the invention or of an electrolysis device according to the invention for chlor-alkali electrolysis.
  • Embodiments described herein of each aspect of the invention may be combined in any manner. Further, the embodiments described for the three aspects of the invention may be combined in any manner.
  • FIG. 1 An electrolysis cell 1 according to the invention for chlor-alkali electrolysis is shown in Fig. 1 .
  • the electrolysis cell 1 comprises an anode chamber 2 and a cathode chamber 3.
  • the anode chamber 2 comprises anode 4, an electrolytic solution (not shown), a circulation structure 5, and one baffle plate 6.
  • the electrolytic solution comprises water and approximately 180 to 280 g/L of sodium chloride.
  • the anode 4 and the circulation structure 5 extend along a height section of the anode chamber 2.
  • the circulation structure 5 divides the anode chamber 2 into an upflow section 7 and a downflow section 8.
  • the ratio of the cross section of the upflow section 7 to the cross section of the downflow section 8 is below 1.
  • the circulation structure 5 effects a gas lift effect and creates a high degree of essentially vertical circulation of the electrolytic solution around the circulation structure 5:
  • the anode 4 generates chlorine gas bubbles from the electrolytic solution. These gas bubbles have a lower density than the surrounding electrolytic solution and stream to the top end of the anode chamber 2, which characterizes upflow section 7.
  • the rising gas bubbles drag electrolytic solution from lower parts of the anode chamber 2.
  • electrolytic solution is dragged and/or ousted by the gas bubbles from the top end of the anode chamber 2, which creates downflow section 8.
  • a stream of electrolytic solution from the downflow section 8 collides a top surface of the baffle plate 6. The high degree of vertical circulation allows mixing of the electrolytic solution and improves homogeneity of the electrolytic solution.
  • An electrolysis device comprises at least one electrolysis cell 1 according to the invention, preferably a plurality of electrolysis cells 1.
  • the baffle plate 6 and the inlets 9 are arranged at the bottom end (in the direction of the center of gravity) of the anode chamber 2.
  • the horizontal baffle plate 6 is shown in more detail in Fig. 2 .
  • the baffle plate 6 is arranged such that a stream from two inlets 9 of the anode chamber 2 collides with the baffle plate 6.
  • the stream comprises water and about 300 g/L of sodium chloride.
  • the baffle plate 6 causes perturbations, which enforces mixing of the stream with the electrolytic solution comprising water and approximately 180 to 280 g/L of sodium chloride. This improves homogeneity, in particular horizontal homogeneity, of the electrolytic solution in the anode chamber 2.
  • a stream of electrolytic solution from the downflow section 8 collides with the baffle plate 6 as well. This results in a particular homogenous electrolytic solution in the anode chamber 2.
  • Fig. 3A and 3B show preferred embodiments of the downcomers from top view.
  • the circulation structure 5 forms downcomers.
  • the downcomers mechanically support the anode 4 against an ion-exchange membrane, which may be pressed against the anode 4 by pressure from the cathode chamber.
  • the downcomers have the shape of a trough.
  • the troughs are open towards the anode 4.
  • the downcomers have the shape of one half of a regular hexagon.
  • the downcomers form a V-shape. The peak of the V points towards the anode 4.
  • the circulation structure 5 divided the anode chamber 2 into an upflow section 7 and a downflow section 8.
  • the ratio of the cross section of the upflow section 7 to the cross section of the downflow section 8 was 1.
  • Chlor-alkali electrolysis was started in the electrolysis cell.
  • Aqueous sodium chloride comprising 300 g/L sodium chloride was fed into the cell.
  • the concentration of sodium chloride in the electrolytic solution was measured at 18 different locations at six different heights of the electrolysis cell. The results are shown in Table 1.
  • Table 1 Concentration of sodium chloride in the electrolytic solution at 18 different locations of the electrolysis cell (values in g/L). 209 202 204 211 218 213 223 220 218 225 220 225 230 220 225 232 227 227
  • the highest detected concentration difference between the 18 locations was 30 g/L (232 g/L - 202 g/L).
  • the highest detected concentration difference between the 18 locations was 22 g/L (222 g/L - 200 g/L).
  • a ratio of the cross section of the upflow section 7 to the cross section of the downflow section 8 of below 1 is superior for having a homogenous electrolytic solution.
  • the height of the circulation structure 5 was 71 % of the height of the anode 4.
  • Chlor-alkali electrolysis was started in the electrolysis cell.
  • Aqueous sodium chloride comprising 300 g/L sodium chloride was fed into the cell.
  • the results are shown in Table 3.
  • Table 3 Concentration of sodium chloride in the electrolytic solution at six different locations at six different heights of the electrolysis cell in two different runs (values in g/L). 1 st run 2 nd run Height 1 205 203 Height 2 204 202 Height 3 204 206 Height 4 217 216 Height 5 215 216 Height 6 216 222 Max. value 217 222 Min. value 204 202 Average value of max. values 220 Average value of min. values 203 Difference 17
  • the highest average concentration difference was 17 g/L.
  • the highest average concentration difference was 21 g/L.
  • Chlor-alkali electrolysis was started in the electrolysis cell.
  • Aqueous sodium chloride comprising 300 g/L sodium chloride was fed into the cell.
  • Table 5 Concentration of sodium chloride in the electrolytic solution at five different locations at five different heights of the electrolysis cell in three different runs (values in g/L). 1 st run 2 nd run 3 rd run Height 1 197 194 193 Height 2 199 193 197 Height 3 199 195 199 Height 4 209 204 206 Height 5 211 204 210 Max. value 211 204 210 Min. value 197 193 193 Average value of max. values 208 Average value of min. values 194 Difference 14
  • the highest average concentration difference was 14 g/L.
  • An electrolysis cell 1 in line with the present invention and Fig. 1 , 2 was prepared.
  • the horizontal baffle plate 6 was arranged horizontally.
  • the baffle plate was arranged such that a stream from two inlets 9 of the anode chamber 2 collides with the baffle plate 6.
  • Chlor-alkali electrolysis was started in the electrolysis cell.
  • Aqueous sodium chloride comprising 300 g/L sodium chloride was fed into the cell.
  • the concentration of sodium chloride in the electrolytic solution was measured at three different locations at the same height at the bottom end of the electrolysis cell. The results are shown in Table 6.
  • Table 6 Concentration of sodium chloride in the electrolytic solution at three different locations at the same height at the bottom end of the electrolysis cell (values in g/L). 227 226 223
  • the highest detected concentration difference between the three locations was 4 g/L (227 g/L - 223 g/L).
  • the highest detected concentration difference between the three locations was 16 g/L (228 g/L - 212 g/L).

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  • 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)
EP21159816.4A 2021-03-01 2021-03-01 Electrolysis cell, electrolysis device for chlor-alkali electrolysis and use of an electrolysis cell for chlor-alkali electrolysis Withdrawn EP4053307A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP21159816.4A EP4053307A1 (en) 2021-03-01 2021-03-01 Electrolysis cell, electrolysis device for chlor-alkali electrolysis and use of an electrolysis cell for chlor-alkali electrolysis
JP2023549076A JP2024507353A (ja) 2021-03-01 2022-02-18 クロルアルカリ電解用の電解セル、電解装置及びクロルアルカリ電解用電解セルの使用
PCT/EP2022/054033 WO2022184467A1 (en) 2021-03-01 2022-02-18 Electrolysis cell, electrolysis device for chlor-alkali electrolysis and use of an electrolysis cell for chlor-alkali electrolysis
BR112023017493A BR112023017493A2 (pt) 2021-03-01 2022-02-18 Célula de eletrólise, dispositivo de eletrólise para eletrólise de cloro-álcali e uso de uma célula de eletrólise para eletrólise de cloro-álcali
US18/279,830 US20240133055A1 (en) 2021-03-01 2022-02-18 Electrolysis cell, electrolysis device for chlor-alkali electrolysis and use of an electrolysis cell for chlor-alkali electrolysis
EP22706810.3A EP4301902A1 (en) 2021-03-01 2022-02-18 Electrolysis cell, electrolysis device for chlor-alkali electrolysis and use of an electrolysis cell for chlor-alkali electrolysis
CA3196773A CA3196773A1 (en) 2021-03-01 2022-02-18 Electrolysis cell, electrolysis device for chlor-alkali electrolysis and use of an electrolysis cell for chlor-alkali electrolysis
CN202280008339.9A CN116635574A (zh) 2021-03-01 2022-02-18 电解池、用于氯碱电解的电解装置和电解池用于氯碱电解的用途
KR1020237019937A KR20230104964A (ko) 2021-03-01 2022-02-18 염소-알칼리 전기분해용 전기분해 셀, 전기분해 디바이스 및 염소-알칼리 전기분해용 전기분해 셀의 용도

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EP21159816.4A EP4053307A1 (en) 2021-03-01 2021-03-01 Electrolysis cell, electrolysis device for chlor-alkali electrolysis and use of an electrolysis cell for chlor-alkali electrolysis

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EP21159816.4A Withdrawn EP4053307A1 (en) 2021-03-01 2021-03-01 Electrolysis cell, electrolysis device for chlor-alkali electrolysis and use of an electrolysis cell for chlor-alkali electrolysis
EP22706810.3A Pending EP4301902A1 (en) 2021-03-01 2022-02-18 Electrolysis cell, electrolysis device for chlor-alkali electrolysis and use of an electrolysis cell for chlor-alkali electrolysis

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US (1) US20240133055A1 (zh)
EP (2) EP4053307A1 (zh)
JP (1) JP2024507353A (zh)
KR (1) KR20230104964A (zh)
CN (1) CN116635574A (zh)
BR (1) BR112023017493A2 (zh)
CA (1) CA3196773A1 (zh)
WO (1) WO2022184467A1 (zh)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4415146A1 (de) 1994-04-29 1995-11-02 Uhde Gmbh Elektrode für Elektrolysezellen mit Ionenaustauscher-Membran
US6200435B1 (en) * 1998-05-11 2001-03-13 Chlorine Engineers Corp., Ltd. Ion exchange membrane electrolyzer
US6282774B1 (en) 1996-10-05 2001-09-04 Krupp Uhde Gmbh Electrolysis apparatus and process for manufacturing same
US6503377B1 (en) 1998-04-11 2003-01-07 Krupp Uhde Gmbh Electrolysis apparatus for producing halogen gases
WO2004040040A1 (de) 2002-10-23 2004-05-13 Uhdenora Technologies S.R.L. Elektrolysezelle mit innenrinne
US6773561B1 (en) * 1999-08-27 2004-08-10 Asahi Kasei Kabushiki Kaisha Unit cell for alkali chloride metal aqueous solution electrolytic tank
US20060042935A1 (en) 2002-11-27 2006-03-02 Hiroyoshi Houda Bipolar zero-gap type electrolytic cell
WO2009007366A2 (en) 2007-07-10 2009-01-15 Uhdenora S.P.A. Elastic current collector for electrochemical cells
WO2010055152A1 (en) 2008-11-17 2010-05-20 Uhdenora S.P.A. Elementary cell and relevant modular electrolyser for electrolytic processes
US20170306513A1 (en) * 2014-12-03 2017-10-26 Bluestar (Beijing) Chemical Machinery Co., Ltd. Ion Exchange Membrane Electrolytic Cell

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4415146A1 (de) 1994-04-29 1995-11-02 Uhde Gmbh Elektrode für Elektrolysezellen mit Ionenaustauscher-Membran
US6282774B1 (en) 1996-10-05 2001-09-04 Krupp Uhde Gmbh Electrolysis apparatus and process for manufacturing same
US6503377B1 (en) 1998-04-11 2003-01-07 Krupp Uhde Gmbh Electrolysis apparatus for producing halogen gases
US6200435B1 (en) * 1998-05-11 2001-03-13 Chlorine Engineers Corp., Ltd. Ion exchange membrane electrolyzer
US6773561B1 (en) * 1999-08-27 2004-08-10 Asahi Kasei Kabushiki Kaisha Unit cell for alkali chloride metal aqueous solution electrolytic tank
WO2004040040A1 (de) 2002-10-23 2004-05-13 Uhdenora Technologies S.R.L. Elektrolysezelle mit innenrinne
US20060042935A1 (en) 2002-11-27 2006-03-02 Hiroyoshi Houda Bipolar zero-gap type electrolytic cell
WO2009007366A2 (en) 2007-07-10 2009-01-15 Uhdenora S.P.A. Elastic current collector for electrochemical cells
WO2010055152A1 (en) 2008-11-17 2010-05-20 Uhdenora S.P.A. Elementary cell and relevant modular electrolyser for electrolytic processes
US20170306513A1 (en) * 2014-12-03 2017-10-26 Bluestar (Beijing) Chemical Machinery Co., Ltd. Ion Exchange Membrane Electrolytic Cell

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EP4301902A1 (en) 2024-01-10
US20240133055A1 (en) 2024-04-25
BR112023017493A2 (pt) 2023-10-24
CN116635574A (zh) 2023-08-22
WO2022184467A1 (en) 2022-09-09
CA3196773A1 (en) 2022-09-09
JP2024507353A (ja) 2024-02-19
KR20230104964A (ko) 2023-07-11

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