EP0095997A1 - Procédé pour la production de l'eau oxygénée et son utilisation - Google Patents

Procédé pour la production de l'eau oxygénée et son utilisation Download PDF

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Publication number
EP0095997A1
EP0095997A1 EP83710018A EP83710018A EP0095997A1 EP 0095997 A1 EP0095997 A1 EP 0095997A1 EP 83710018 A EP83710018 A EP 83710018A EP 83710018 A EP83710018 A EP 83710018A EP 0095997 A1 EP0095997 A1 EP 0095997A1
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EP
European Patent Office
Prior art keywords
oxygen
solid electrolyte
anode
water
gas
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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
EP83710018A
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German (de)
English (en)
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EP0095997B1 (fr
Inventor
Samuel Dr. Stucki
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BBC Brown Boveri AG Switzerland
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BBC Brown Boveri AG Switzerland
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Publication of EP0095997A1 publication Critical patent/EP0095997A1/fr
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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
    • 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
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/28—Per-compounds
    • C25B1/30—Peroxides

Definitions

  • the invention relates to a method for the electrolytic production of hydrogen peroxide according to the preamble of claim 1 and its use according to the preamble of claim 6.
  • Hydrogen peroxide is now produced either by the older peroxodisulfuric acid or the younger anthraquinone process.
  • the amount of electrical energy required in the first case is approx. 13000 kWh and in the second case (in the case of electrolytic hydrogen production) approx. 3000 kWh per ton of hydrogen peroxide.
  • hydrogen peroxide is produced also in electrolytic cells provided that oxygen is present on the cathode side and the cathode is made of carbon or some other material that promotes the electrochemical reduction of oxygen to H 2 0 2 .
  • the reaction equation is: This harmful reaction is a particular problem in fuel cells, where it is known that oxygen is reduced to water.
  • the invention has for its object to provide a production process for hydrogen peroxide H 2 0 2 , which provides a product with high economy while avoiding expensive separation and purification processes in a simple manner, which can be used as directly as possible in many fields.
  • the object is preferably achieved by the additional features specified in claim 5.
  • Fig. 1 is the basic structure of a cell suitable for H20 2 production in the sectional view and its work shown schematically.
  • 1 is the solid electrolyte based on H 3 0 + or OH ion conduction, which is preferably present as an ion exchange membrane in the form of a film.
  • a perfluorinated polymer with sulfonic acids is advantageously used as the ion-exchanging groups.
  • this film can be very thin . It may also be porous, ie gas permeable.
  • a product from Du Pont known under the trade name "Nafion" can be used as a suitable material.
  • the coating 2 acting as an anode is advantageously carried out as an electrocatalyst based on platinum metals, platinum metal oxides or mixtures thereof, preferably as an IrO 2 / RuO 2 layer. In the case of an OH-conducting electrolyte, this coating would preferably consist of NiO.
  • the coating 3, which acts as a cathode, on the other hand, must consist of a material which catalytically promotes the reduction of 0 2 to H 2 0 2 , which includes above all activated substances containing elemental carbon (for example carbon powder) and certain metal chelates. 4 represent the current leads (current collectors) arranged on the outside of the coatings 2 and 3, which can be designed as corrugated perforated metal sheets, metal grids or metal mesh.
  • FIG. 5 is a direct current source with the voltage U.
  • the directions of flow of the supplied H 2 0 and the discharged H 2 0 2 (as an aqueous solution) and symbolically of the additionally supplied 1/2 0 2 are correct drawn in stoichiometric ratios (indicated by arrows). For technical reasons, however, in practice 0 2 must be added in a stoichiometric amount.
  • the resulting 1/2 0 2 and on the negative side the used 1/2 0 2 + 1/2 0 2 and in the interior of the solid electrolyte 1 the 2H + migrating through the membrane are shown.
  • the electron currents 2e are also indicated by arrows both on the anode and on the cathode side.
  • Fig. 2 shows the functional diagram of an electrolytic cell for a first variant of the production process for H 2 0 2.
  • the reference numerals 1 to 4 correspond exactly to those of Fig. 1.
  • Both the externally supplied gas stream 1/2 0 2 as that on the A gas flow 1/2 0 2 which arises on the anode side and is passed around the solid electrolyte 1 and fed to the cathode side is shown by corresponding arrows.
  • the other symbols result analogously to FIG. 1.
  • FIG. 3 shows the functional diagram of an electrolytic cell for a second variant of the production process for H 202 .
  • the reference numerals 1 to 4 correspond exactly to those in FIG. 1.
  • the solid electrolyte 1 is designed here as a gas-permeable membrane.
  • the gas stream 1/2 0 2 fed in from the outside, as well as the gas stream 1/2 0 2 arising on the anode side or the two combined gas streams passing through the solid electrolyte 1 are in the stoichiometrically correct Ver Ratio drawn in the figure and provided with arrows. All other symbols result in the same sense as shown in Fig. 1.
  • FIG. 4 shows the functional diagram of an electrolytic cell for a variant of the production process for H 2 0 2 , in which an aqueous NaOH solution is assumed.
  • the reference numeral l to 4 correspond exactly to those of Fig. 1. Both which is externally supplied feed gas stream 1/2 0 2 as the resulting at the anode side and around led to the solid electrolyte 1 and the cathode side gas supplied current 1/2 0 2 by corresponding arrows drawn.
  • a 2-molar aqueous NaOH solution (marked by arrow 2NaOH and arrow H 2 0) was assumed.
  • the water and sodium ion currents passing through the solid electrolyte 1 are shown in the figure in the stoichiometrically correct ratio in this case and are provided with arrows.
  • the solution of H 2 0 2 and 2NaOH formed on the cathode side is also indicated by arrows.
  • FIG. 5 shows the functional diagram of an electrolytic cell for a variant of the production process for H 2 0 2 , in which an aqueous NaCl solution is assumed.
  • the reference numerals 1 to 4 correspond exactly to those in FIG. 1.
  • the solid electrolyte 1 is designed here as a gas-tight ion exchange membrane, which is continued in a partition 6.
  • the anode and cathode sides are thus completely separated from each other with regard to both liquids and gases.
  • the 1 molar aqueous solution supplied on the anode side is represented by the arrows 2NaCl and 2H 2 0.
  • the water and sodium ion currents passing through the solid electrolyte are also indicated by arrows. The same applies to the gas stream (0 2 ) + C1 2 that is created and to be discharged on the anode side and to the gas stream 02 to be supplied from the outside on the cathode side.
  • Fig. 6 shows the schematic structure of an electrolysis device for producing H 2 0 2 in section.
  • the components corresponding to reference numerals 1 to 4 are identical to those of FIG. 1.
  • 7 is a pressure vessel constructed on a base plate 8 in a water-tight and gas-tight manner for receiving the electrolytic cell in the narrower sense.
  • the latter has on the positive side a space closed on all sides, the anode chamber 9, which is provided on its upper side with an overflow nozzle 10 for H 2 0 and 0 2 .
  • the cathode chamber 11 which has an opening on its upper end face, the inflow connector 12 for 0 2 or the oxygen-containing gas, for example air (0 2 + N 2 ).
  • 13 is the water supply line (feed), 15 is a circulation pump for the water.
  • a level control 16 (indicated symbolically) is provided, which is controlled by a regulating valve 14.
  • 17 is the supply line for the oxygen or the oxygen-containing gas (for example air), indicated by the symbol (N 2 ) +0 2 .
  • 18 provides a valve for keeping the pressure constant (p o ) in the pressure vessel 7, 19 the H 2 0 2 - Derivation (removal), which also leads to the solvent H 2 0 and the excess oxygen-containing gas (N 2 ) +0 2 .
  • the flow directions are shown by arrows.
  • Anode water decomposition: Cathode: Reduction of oxygen:
  • 1/2 0 2 must therefore also be supplied to the outside of the cell, which is symbolically indicated in FIG. 1 by an arrow pointing obliquely downward and drawn on the cathode side.
  • the other half amount of oxygen corresponding to 1/2 0 2 comes from the electrolysis of the anode (arrow pointing vertically upwards) and must also be brought to the cathode side in some way.
  • the new process does not bind to any liquid electrolytes in any way and that it can work completely free of salt concentrations or additional base or acid components.
  • the Na compound does not primarily serve as an electrolyte, although the Na + ions contribute to the conductivity.
  • the example according to FIG. 5 basically represents a combination of an electrolytic cell for generating H 2 0 2 with a chlorine / alkali cell.
  • the electrolytic cell used to carry out the method had, as solid electrolyte 1, a membrane made of a perfluorinated polymer with sulfonic acids with the trade name "Nafion 120" from Du Pont.
  • This Nafion film was provided on the positive side with a gas-permeable coating 2 made of a noble metal mixed oxide acting as an anode, in this case according to the formula (Ru 0.5 Ir 0.5 ) O 2 .
  • the negative side carried the gas-permeable coating 3 acting as a cathode in the form of a graphite coating.
  • the current was supplied via the current collectors 4, a foil made of porous sintered titanium on the anode side and a mesh (wire mesh) made of nickel on the cathode side found.
  • the cell was closed and held together by a frame made of titanium, forming the anode chamber 9 and the cathode chamber 11.
  • an opening was provided in each frame on the lower and the upper end.
  • the upper part of the anode chamber 9 had an overflow connection 10 for H 2 0 and 0 2 and the cathode chamber 11 an inflow connection 12 for 0 2 or 0 2 + N 2 *.
  • the anode chamber 9 was connected via the water supply line 13 (feed) and the regulating valve 14 fed with deionized water at 80 ° C.
  • the cathode chamber 11 was supplied with a humidified 0 2 stream of approximately 1 l / h via the connector 12.
  • a cell designed according to Example I was installed in a gas-tight pressure vessel 7 closed at the bottom by a base plate 8.
  • the mounted on the lower end faces of the anode chamber 9 and the cathode chamber 11 openings were passed through the base plate 8 and to the water supply 13 or the H 2 0 2 19 Dissipation (Removal) connected.
  • the pressure vessel 7 was now filled by feeding water through the water supply line 13 and the regulating valve 14 up to the level control 16 mark.
  • the entire pressure vessel 7 was then placed under a pressure p of 10 MPa on both the gas and water side.
  • the valve 18 for keeping the pressure constant (p) ensured that this pressure was maintained. It goes without saying that the oxygen-containing gas supplied via the supply line 17 (in the present case compressed air N 2 + 0 2 ) and the water fed in via the supply line 13 must also be supplied to the device at least under this pressure. Then the device was put into operation by connecting a current source (see FIG. 5 in FIG. 1) to the current collectors 4 and switching on the circulation pump 15. With a DC voltage of 1.4 V and a regulated compressed air supply of 0.5 1 / h, a current density of 100 mA / cm 2 was achieved. The H 2 0 2 content of the aqueous solution removed was on average 3% by weight.
  • the invention is not restricted to the exemplary embodiments.
  • the method can also be carried out with starting materials other than pure water and oxygen or air. It is largely independent of the salt concentration of the starting solution.
  • the selection of the appropriate media, whether more or less pure water, aqueous salt solution or alkaline or otherwise basic solution, is determined solely by the end product to be aimed at or its suitability for use: e.g. Tap water to brackish water up to 5 g / 1 salinity.

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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)
EP83710018A 1982-05-28 1983-04-11 Procédé pour la production de l'eau oxygénée et son utilisation Expired EP0095997B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH329482 1982-05-28
CH3294/82 1982-05-28

Publications (2)

Publication Number Publication Date
EP0095997A1 true EP0095997A1 (fr) 1983-12-07
EP0095997B1 EP0095997B1 (fr) 1987-04-01

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EP83710018A Expired EP0095997B1 (fr) 1982-05-28 1983-04-11 Procédé pour la production de l'eau oxygénée et son utilisation

Country Status (4)

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US (1) US4455203A (fr)
EP (1) EP0095997B1 (fr)
JP (1) JPS58213885A (fr)
DE (1) DE3370657D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4317349C1 (de) * 1993-05-25 1994-10-13 Metallgesellschaft Ag Verfahren zur Herstellung von Alkaliperoxid/Percarbonat-Lösungen
WO1997013006A1 (fr) * 1995-10-06 1997-04-10 The Dow Chemical Company Membrane composite et son utilisation dans les syntheses chimiques
CN113774409A (zh) * 2021-09-24 2021-12-10 浙江清越科技有限公司 一种静置式平板过氧化氢电化学发生器

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758317A (en) * 1986-11-20 1988-07-19 Fmc Corporation Process and cell for producing hydrogen peroxide
JP2574678B2 (ja) * 1987-08-07 1997-01-22 工業技術院長 過酸化物を含有する水溶液の製造装置
JP2558042B2 (ja) * 1992-09-03 1996-11-27 本州製紙株式会社 過酸化水素の製造方法
US5645700A (en) * 1994-12-28 1997-07-08 Eltron Research, Inc. Polymer membrane based electrolytic cell and process for the direct generation of hydrogen peroxide in liquid streams
US6255009B1 (en) 1998-03-28 2001-07-03 The United States Of America As Represented By The Secretary Of The Navy Combined cycle power generation using controlled hydrogen peroxide decomposition
US6316653B1 (en) * 1998-07-06 2001-11-13 The Trustees Of Princeton University Mn4O4-cubane type catalysts
FR2784979B1 (fr) * 1998-10-26 2001-09-28 Cie Ind Pour Le Traitement De Procede electrochimique de desinfection des eaux par electroperoxydation et dispositif pour la mise en oeuvre d'un tel procede
WO2001010215A1 (fr) 1999-08-05 2001-02-15 Steris Inc. Synthese electrolytique de l'acide peracetique
EP1170259A1 (fr) * 2000-07-05 2002-01-09 Sony International (Europe) GmbH Dispositif électrochimique et procödé de purification de fluids
DE10054082A1 (de) * 2000-10-31 2002-05-16 Forschungszentrum Juelich Gmbh Verfahren zur enzymatischen Oxidation von Substraten mit H2O2
ITMI20061799A1 (it) * 2006-09-21 2008-03-22 Industrie De Nora Spa Cella di elettrolisi per la produzione di acqua ossigenata e metodo di utilizzazione
US7754064B2 (en) * 2006-09-29 2010-07-13 Eltron Research & Development Methods and apparatus for the on-site production of hydrogen peroxide
WO2011036633A2 (fr) 2009-09-23 2011-03-31 Ecolab Usa Inc. Système de nettoyage in situ
US8937037B2 (en) 2011-03-02 2015-01-20 Ecolab Usa Inc. Electrochemical enhancement of detergent alkalinity
EA036528B1 (ru) 2014-08-15 2020-11-19 Глоубал Ойл Эор Системз, Лтд. Генератор пара пероксида водорода для нефтепромысловых применений
US20170058500A1 (en) 2015-08-24 2017-03-02 Kohler Co. Clean toilet and accessories
CN106939427B (zh) * 2017-02-23 2018-08-28 清华大学 一种利用自供氧双阴极装置同时产生双氧水和氢气的方法
CN107317051B (zh) * 2017-06-05 2020-03-20 南京大学 一种以过氧化氢为添加剂的锂-氧气电池电解液的制备方法
CN108545804A (zh) * 2018-05-08 2018-09-18 凡邸（天津）环保科技有限公司 一种基于生物电化学、高级氧化耦合体系杀灭细菌的方法
JP7126654B2 (ja) * 2018-09-05 2022-08-29 富士電機株式会社 電気分解ユニット

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3856640A (en) * 1971-06-02 1974-12-24 Wright H D Production of hydrogen peroxide
US4118305A (en) * 1975-01-13 1978-10-03 Canadian Patents And Development Limited Apparatus for electrochemical reactions
EP0002423A1 (fr) * 1977-12-06 1979-06-13 Battelle Memorial Institute Procédé et machine pour le lavage et le blanchiment de matières textiles
GB2071157A (en) * 1977-12-09 1981-09-16 Gen Electric Catalytic electrode and combined catalytic electrode and electrolytic structure
FR2493878A1 (fr) * 1980-11-13 1982-05-14 Ardennes Cellulose Procede pour la production de l'eau oxygenee en milieu alcalin et cellule electrolytique pour la mise en oeuvre dudit procede
EP0031660B1 (fr) * 1979-12-27 1985-03-27 Permelec Electrode Ltd Dispositif d'électrolyse à diaphragme en électrolyte polymère solide et procédé pour la production de ce dispositif

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1473527A (en) * 1973-10-24 1977-05-11 Kernforschungsanlage Juelich Electrode suitable for the generation of hydrogen peroxide
US4384931A (en) * 1981-09-04 1983-05-24 Occidental Research Corporation Method for the electrolytic production of hydrogen peroxide

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3856640A (en) * 1971-06-02 1974-12-24 Wright H D Production of hydrogen peroxide
US4118305A (en) * 1975-01-13 1978-10-03 Canadian Patents And Development Limited Apparatus for electrochemical reactions
EP0002423A1 (fr) * 1977-12-06 1979-06-13 Battelle Memorial Institute Procédé et machine pour le lavage et le blanchiment de matières textiles
GB2071157A (en) * 1977-12-09 1981-09-16 Gen Electric Catalytic electrode and combined catalytic electrode and electrolytic structure
EP0031660B1 (fr) * 1979-12-27 1985-03-27 Permelec Electrode Ltd Dispositif d'électrolyse à diaphragme en électrolyte polymère solide et procédé pour la production de ce dispositif
FR2493878A1 (fr) * 1980-11-13 1982-05-14 Ardennes Cellulose Procede pour la production de l'eau oxygenee en milieu alcalin et cellule electrolytique pour la mise en oeuvre dudit procede

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4317349C1 (de) * 1993-05-25 1994-10-13 Metallgesellschaft Ag Verfahren zur Herstellung von Alkaliperoxid/Percarbonat-Lösungen
WO1997013006A1 (fr) * 1995-10-06 1997-04-10 The Dow Chemical Company Membrane composite et son utilisation dans les syntheses chimiques
AU712295B2 (en) * 1995-10-06 1999-11-04 Dow Chemical Company, The Composite membrane and use thereof for chemical synthesis
CN113774409A (zh) * 2021-09-24 2021-12-10 浙江清越科技有限公司 一种静置式平板过氧化氢电化学发生器
CN113774409B (zh) * 2021-09-24 2023-12-19 浙江清越科技有限公司 一种静置式平板过氧化氢电化学发生器

Also Published As

Publication number Publication date
US4455203A (en) 1984-06-19
DE3370657D1 (en) 1987-05-07
JPS58213885A (ja) 1983-12-12
EP0095997B1 (fr) 1987-04-01

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