EP0820536A1 - Procede de production de solutions de peroxyde/percarbonate alcalin - Google Patents

Procede de production de solutions de peroxyde/percarbonate alcalin

Info

Publication number
EP0820536A1
EP0820536A1 EP94917610A EP94917610A EP0820536A1 EP 0820536 A1 EP0820536 A1 EP 0820536A1 EP 94917610 A EP94917610 A EP 94917610A EP 94917610 A EP94917610 A EP 94917610A EP 0820536 A1 EP0820536 A1 EP 0820536A1
Authority
EP
European Patent Office
Prior art keywords
alkali
solution
anode
cell
oxygen
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Withdrawn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
EP94917610A
Other languages
German (de)
English (en)
Inventor
Eilhard Hillrichs
Ulrich Sander
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.)
MG Technologies AG
Original Assignee
Metallgesellschaft AG
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 Metallgesellschaft AG filed Critical Metallgesellschaft AG
Publication of EP0820536A1 publication Critical patent/EP0820536A1/fr
Withdrawn legal-status Critical Current

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
    • C25B1/28—Per-compounds
    • C25B1/30—Peroxides
    • 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

Definitions

  • the invention relates to a method for producing aqueous alkaline peroxide and / or percarbonate solution in an electrochemical cell, which consists of a porous oxygen diffusion cathode and an anode.
  • Peroxide solutions are becoming increasingly important as oxidation and bleaching chemicals because the reaction product water, which is produced from the oxidizing agent peroxide, does not pollute the environment.
  • sodium peroxide or sodium hydroperoxide is formed in an aqueous solution.
  • Sodium percarbonate-containing solutions which are prepared by mixing sodium carbonate-containing and hydrogen peroxide-containing solutions can also be used as bleaching agents. Since hydrogen peroxide is a relatively unstable compound and strict safety requirements must be observed for its transport, storage and handling, it is much easier and more advantageous to produce peroxide solutions directly at the point of use by electrochemical means.
  • E. Yeager Industrial Electrochemistry, Plenum Press, 1982, page 31 discloses an electrochemical cell which, according to a fuel cell concept, is used for the production of a peroxide solution without the application of an external voltage and which consists of a hydrogen diffusion Anode, a KOH electrolyte and an air operated oxygen diffusion cathode consists.
  • This electrochemical cell has the disadvantage of a low current density, which means that the temporal yield of peroxide is so low that it is not possible to produce peroxide economically using this process.
  • the aim of the invention is to provide a process for the production of aqueous alkaline peroxide and / or percarbonate solution in an electrochemical cell which is economical.
  • the cell is operated with a low external cell voltage and in that an alkali metal hydroxide-containing and / or alkali metal carbonate-containing electrolyte is passed through the cell chamber between the oxygen diffusion cathode and the anode and that by cathodic reduction of Oxygen alkali peroxide and / or alkali percarbonate is formed, the H ⁇ O- j / alkali molar ratio is less than 4.
  • the cell is operated with an external cell voltage of 0.5 to 2.0 V.
  • Alkali carbonate and the product solution contains 1 to 100 g / 1 H ⁇ O-.
  • NaOH is provided as the alkali hydroxide or KOH and Na-CO ⁇ or K-CC is used as alkali carbonate.
  • the alkali hydroxide solution contains 50 to 100 g / 1 alkali hydroxide or alkali carbonate and the product solution contains 10 to 70 g / 1 H-O-.
  • a chelating agent or at least one salt of a chelating agent is added to the electrolyte solution.
  • the chelating agent consists of
  • Ethylenediaminetetraacetic acid EDTA
  • the alkali metal salts are used as salts of the chelating agent.
  • the porous oxygen diffusion cathode consists of a carbon fabric or carbon fleece with a coating of a mixture of Teflon and carbon black.
  • air, oxygen-enriched air or oxygen is fed to the oxygen diffusion cathode.
  • a hydrogen diffusion anode is used as the anode, which consists of a carbon fabric or carbon fleece and a mixture of Teflon, carbon black and noble metal and is covered with a proton-permeable membrane.
  • the proton-permeable membrane consists of a non-porous cation exchange membrane or of a gas and electrolyte-impermeable microporous membrane.
  • a depolarized metal electrode coated with a noble metal and / or noble metal oxide catalyst and having a mesh or lattice structure is used as the anode, which has a cation-exchange membrane on the cathode side as "solid polymer electrolyte" is covered, a gas, a liquid or a substance dissolved in a liquid being used as the depolarizer.
  • the noble metals ruthenium, rhodium, palladium, rhenium, iridium or platinum or their oxides are used as catalysts.
  • Gas diffusion electrodes used a cation exchange membrane, and the aqueous alkali hydroxide and / or alkali carbonate solution is fed into the cathode chamber, and the alkaline peroxide and / or percarbonate solution formed therein is then passed through the anode chamber.
  • the aqueous solution of an alkali metal hydroxide and / or alkali metal carbonate which contains soda is used as the starting material, the soda solution being contaminated by polyvalent cations and other mineral components, a pH value from 8 to 13 and a salt concentration between 30 g / 1 and the solubility limit of the starting material and that the starting material is then filtered and the filtrate with a pH of 8 to 13 is passed through a selective cation exchanger for the absorption of divalent and multivalent cations and that the solution is fed to the electrochemical cell.
  • a soda-containing mineral or the soda-containing solid is used as the starting material for the production of the soda-containing solution, which, in the event of thermal decomposition of a peroxide used for bleaching paper or cellulose, Bleach is produced.
  • FIG. 1 shows the electrolysis cell with the associated lines, the cell consisting of an oxygen diffusion cathode and a hydrogen diffusion anode.
  • FIG. 2 shows the electrolysis cell with the associated lines, the cell consisting of an oxygen diffusion cathode and a product-permeable depolarized anode with “solid polymer electrolyte” (SPE).
  • SPE solid polymer electrolyte
  • FIG. 1 shows the electrolysis cell, which consists of an oxygen diffusion cathode (1) and a hydrogen diffusion anode (2).
  • the cathode is composed of two perforated nickel sheets, between which an approximately 0.4 mm thick, porous carbon fabric is pressed, which is coated with a Teflon / carbon black mixture.
  • On the back of this oxygen diffusion cathode (1) is passed oxygen or air through a line (3) at a pressure of 0.02 to 0.1 bar.
  • Oxygen diffusion cathode is vented via a line (4).
  • the hydrogen diffusion anode (2) consists of a carbon fabric which is coated with a Teflon / carbon black mixture and is additionally activated with a platinum catalyst.
  • the back of the carbon fabric of the hydrogen diffusion anode is pressed against a corrosion-resistant stainless steel sheet, and the front is covered with a proton-permeable cation exchange membrane (e.g. NAFION 117, DuPont, USA) to protect the hydrogen Separate the anode from the electrolyte.
  • the hydrogen is fed to the rear of the anode at a pressure of 0.02 to 0.1 bar on the carbon fabric via a line (5).
  • the hydrogen diffusion anode (2) is vented via a line (6).
  • the starting materials are introduced into the electrochemical cell via a line (7).
  • the product solution is removed from the electrochemical cell via a line (8).
  • FIG. 2 shows the electrolysis cell, which consists of an oxygen diffusion cathode (1) and a product-permeable depolarized anode (2) with "solid polymer electrolyte” (SPE) (3) as a cover to the cathode side.
  • the cathode is composed of two perforated nickel sheets, between which an approximately 0.4 mm thick, porous carbon fabric is pressed, which is coated with a Teflon / carbon black mixture. Oxygen or air is fed to the back of this oxygen diffusion cathode (1) via a line (4) at a pressure of 0.02 to 0.1 bar.
  • Oxygen diffusion cathode is vented via a line (5).
  • the anode consists of an expanded mesh or a mesh made of a corrosion-resistant metal or electrically conductive non-metal (eg graphite or carbon), the surface of which is coated with an electrochemically active metal or metal oxide catalyst.
  • the anode On the cathode side, the anode is covered with a proton-conducting cation exchange membrane as "solid polymer electrolyte" (SPE) (3).
  • SPE proton-conducting cation exchange membrane
  • the depolarizer is led as a gas, liquid or as a substance dissolved in a liquid to the surface of the metal anode via line (6).
  • the anodically formed oxidation products are removed via line (7).
  • Hydrogen or methanol (10% by weight) in aqueous sulfuric acid (10 to 20% by weight) can be used as the depolarizer.
  • the starting materials are introduced into the electrochemical cell via a line (8).
  • the product solution is removed from the electrochemical cell via a line (9).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (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)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)

Abstract

Il est décrit un procédé de production d'une solution aqueuse alcaline de peroxyde et/ou de percarbonate, dans une cellule électrochimique comprenant une cathode (1) poreuse de diffusion d'oxygène, ainsi qu'une anode (2). Le procédé selon l'invention est caractérisé en ce que la cellule est mise en fonctionnement au moyen d'une faible tension extérieure de cellule, et en ce qu'on envoie à travers l'enceinte de ladite cellule, entre la cathode de diffusion d'oxygène et l'anode, un électrolyte (7) renfermant un hydroxyde alcalin et/ou un carbonate alcalin, et en ce qu'il se forme, par réduction cathodique de l'oxygène, un peroxyde alcalin et/ou un percarbonate alcalin, le rapport molaire H2O2/produit alcalin étant inférieur à 4.
EP94917610A 1993-05-25 1994-05-10 Procede de production de solutions de peroxyde/percarbonate alcalin Withdrawn EP0820536A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4317349 1993-05-25
DE4317349A DE4317349C1 (de) 1993-05-25 1993-05-25 Verfahren zur Herstellung von Alkaliperoxid/Percarbonat-Lösungen
PCT/EP1994/001506 WO1994028198A1 (fr) 1993-05-25 1994-05-10 Procede de production de solutions de peroxyde/percarbonate alcalin

Publications (1)

Publication Number Publication Date
EP0820536A1 true EP0820536A1 (fr) 1998-01-28

Family

ID=6488852

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94917610A Withdrawn EP0820536A1 (fr) 1993-05-25 1994-05-10 Procede de production de solutions de peroxyde/percarbonate alcalin

Country Status (8)

Country Link
US (1) US5766443A (fr)
EP (1) EP0820536A1 (fr)
JP (1) JPH09504827A (fr)
CN (1) CN1060228C (fr)
BR (1) BR9406634A (fr)
CA (1) CA2163896A1 (fr)
DE (1) DE4317349C1 (fr)
WO (1) WO1994028198A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19516304C1 (de) * 1995-05-04 1996-07-25 Metallgesellschaft Ag Verfahren zur Herstellung von Alkaliperoxid-Hydrat
US6998155B2 (en) * 2001-05-23 2006-02-14 Traptek Llc Woven materials with incorporated solids and processes for the production thereof
EP1402105A2 (fr) * 2001-06-26 2004-03-31 Traptek LLC Fil traite et ses procedes de fabrication
MXPA04012543A (es) 2002-06-12 2005-04-19 Traptek Llc Particulas activadas encapsuladas y metodos para elaborar y utilizar las mismas.
EP2520611B1 (fr) * 2006-05-09 2017-06-21 Cocona, Inc. Procédé de fabrication d'une membrane imperméable à l'eau apte à la respiration
WO2008063557A2 (fr) * 2006-11-16 2008-05-29 Gregory Haggquist Articles à propriétés exothermiques améliorées et leurs procédés de fabrication
EP3272907B1 (fr) * 2016-07-20 2019-11-13 Fuelsave GmbH Procédé de fonctionnement d'un dispositif d'electrolyse et système d'entraînement comprenant un dispositif d'electrolyse

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969201A (en) * 1975-01-13 1976-07-13 Canadian Patents And Development Limited Electrolytic production of alkaline peroxide solutions
DE2501342C3 (de) * 1975-01-15 1979-05-17 Kernforschungsanlage Juelich Gmbh, 5170 Juelich Verfahren zur Herstellung von Wasserstoffperoxid
CS192037B1 (en) * 1975-06-19 1979-08-31 Jan Balej Gaseous porous electrode for preparing alkaline solutions of peroxicompounds and process for preparing this electrode
EP0066663A1 (fr) * 1981-06-10 1982-12-15 La Cellulose Des Ardennes Cellule électrolytique de production d'eau oxygénée en milieu alcalin
US4384931A (en) * 1981-09-04 1983-05-24 Occidental Research Corporation Method for the electrolytic production of hydrogen peroxide
US4430176A (en) * 1981-11-13 1984-02-07 Occidental Chemical Corporation Electrolytic process for producing hydrogen peroxide
EP0095997B1 (fr) * 1982-05-28 1987-04-01 BBC Brown Boveri AG Procédé pour la production de l'eau oxygénée et son utilisation
US4921587A (en) * 1985-09-19 1990-05-01 H-D Tech, Inc. Porous diaphragm for electrochemical cell
US4753718A (en) * 1986-11-20 1988-06-28 Fmc Corporation Hydrogen peroxide electrolytic cell
US4693794A (en) * 1986-11-20 1987-09-15 Fmc Corporation Process for manufacturing hydrogen peroxide electrolytically
BR8707943A (pt) * 1986-11-20 1990-02-13 Fmc Corp Celula eletrolitica para reduzir oxigenio a peroxido de hidrogenio,artigo de fabricacao utilizavel para sua construcao e processo para fabricar um catodo de difusao de gas
US4872957A (en) * 1988-07-20 1989-10-10 H-D Tech Inc. Electrochemical cell having dual purpose electrode
ES2110949T3 (es) * 1988-09-19 1998-03-01 H D Tech Inc Celulas y metodo de operacion de celulas electroquimicas de liquido-gas.
US5074975A (en) * 1990-08-08 1991-12-24 The University Of British Columbia Electrochemical cogeneration of alkali metal halate and alkaline peroxide solutions
US5316629A (en) * 1991-09-20 1994-05-31 H-D Tech Inc. Process for maintaining electrolyte flow rate through a microporous diaphragm during electrochemical production of hydrogen peroxide

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9428198A1 *

Also Published As

Publication number Publication date
US5766443A (en) 1998-06-16
WO1994028198A1 (fr) 1994-12-08
DE4317349C1 (de) 1994-10-13
CN1127535A (zh) 1996-07-24
CA2163896A1 (fr) 1994-12-08
JPH09504827A (ja) 1997-05-13
BR9406634A (pt) 1996-02-06
CN1060228C (zh) 2001-01-03

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