EP3662096B1 - Dispositif électrochimique pourvu d'une chambre de stagnation - Google Patents

Dispositif électrochimique pourvu d'une chambre de stagnation Download PDF

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Publication number
EP3662096B1
EP3662096B1 EP18738319.5A EP18738319A EP3662096B1 EP 3662096 B1 EP3662096 B1 EP 3662096B1 EP 18738319 A EP18738319 A EP 18738319A EP 3662096 B1 EP3662096 B1 EP 3662096B1
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Prior art keywords
electrode
chamber
anode
cathode
cathode chamber
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EP18738319.5A
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German (de)
English (en)
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EP3662096A1 (fr
Inventor
Daniele MONTI
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Nuova Control Systems Srl
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Nuova Control Systems Srl
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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
    • C25B1/24—Halogens or compounds thereof
    • C25B1/26—Chlorine; Compounds thereof
    • 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

Definitions

  • the present invention relates to the field of the chemical technology and more in particular to the field of the electrochemical processes as it relates to a particular membrane electrolytic cell characterized by the presence of a stagnation chamber.
  • the device is used in preparing, starting from aqueous solutions with low concentrations of dissolved salts, metastable, oxidizing or reducing substances, to be used in technological processes as replacement of chemically stable reagents.
  • JPS57194273 describes an electrode for producing hydrogen, with low voltage, by means of arranging cation exchange membrane between the anode and the cathode of an electrolytic cell also including porous septa without electrolytic activity not in direct contact with the electrodes.
  • the outlet routes of the produced pure hydrogen and oxygen gases lie on the upper cover, on the contrary the inlet and outlet routes for water and electrolysis liquid lie on the lower wall of the cell.
  • an additional drop separator could be present, containing catalytic material for an additional purification of water or oxygen, flowing vertically.
  • the membrane is arranged at a height so as to obtain a defined distance between the upper portion of the electrolysis chambers and the electrode, and even the electrolysis chambers are separated by membrane walls.
  • the drop separator can include as catalytic material fibres or nickel wires or other catalysing supports such as fibres or ceramic porous bodies.
  • a perforated plate with openings is placed on one side of the anode and/or of the cathode, which has a locking cursor, perforated too and mobile with respect to the perforated plate.
  • An insulating layer and/or a surface heating element is applied to the electrode at the level of the through holes.
  • a membrane filter is placed in the inlet holes of the liquid-gas mixture and the membrane allows the passage of the produced gaseous oxygen and hydrogen and keeps the liquid portion of the mixture.
  • the herein described devices known in the art are devised with the purpose of purifying and collecting the gaseous products, hydrogen and/or oxygen, obtained by means of the electrochemical devices starting from liquid-gas mixtures.
  • an electrolytical device for preparing metastable, oxidizing or reducing substance, starting from aqueous solutions with low concentrations of dissolved salts, which avoids gaseous stagnations so as to determine good yields of the process and a high energy saving.
  • the electrochemical device of the present invention comprising two electrodes, a first electrode with tubular shape and circular section, which is the cathode, and a second electrode with tubular shape and circular section too, acting as anode, the latter is arranged inside the cathode and it is coaxial thereto.
  • the two electrodes limit a space divided into two chambers by a membrane wall concentric to the first electrode, the two chambers are the cathode chamber, between the first electrode and the membrane, and the anode chamber, between the second electrode and the membrane wall.
  • the device then has two sealing bushings, arranged at the ends of the two electrodes, wherein the lower bushing has inlet channels of the electrolytes both to the cathode chamber and to the anode chamber, whereas the upper bushing has the outlet channels of the electrolytes from these chambers.
  • Said device at the intersection between the cathode chamber and the outlet channel of the electrolytes from the cathode chamber has a stagnation chamber with spheroidal shape opened to the cathode chamber and connected to the outlet channel of the electrolytes from the cathode chamber by a connector pipe.
  • the elements constituting the device have particular geometrical sizes.
  • electrochemical device 1 of the present invention comprising:
  • the device is used for the preparation of hypochlorous acid (HOCl) from water and chloride salts.
  • hypochlorous acid HOCl
  • the proposed solution does not determine a simple removal of the gaseous area which has formed, but it allows even to keep partially dissolved the gas which has formed in the gaseous area so as to reduce the friction between the electrolytical solution and the material constituting the device, since the contact between the solid phase and the gaseous phase determines a lower friction with respect to the liquid phase-solid phase combination.
  • the reduction in friction between phases determines a reduction in load losses of the electrolytical solution and therefore a wear reduction of the device itself.
  • the membrane wall is an ion exchange membrane.
  • the section of the bar-shaped electrode is uniform to the upper and lower thread of the bushing, which is provided with a coaxial opening for the bar-shaped electrode, with two cables with cylindrical shape to place the ion exchange membrane and the cylindrical electrode.
  • the electrochemical device of the present invention is used for the preparation of hypochlorous acid (HOCl) from water and sodium chloride (NaCl).
  • HOCl hypochlorous acid
  • NaCl sodium chloride

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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)

Claims (4)

  1. Dispositif électrochimique (1) comprenant
    deux électrodes, une première électrode de forme tubulaire et de section circulaire (cathode) (2) et une seconde électrode de forme tubulaire et de section circulaire (anode) (3) placée à l'intérieur de la première électrode (2) et coaxiale à celle-ci, pour former un espace entre les deux électrodes divisé en deux chambres par une paroi de membrane (4) concentrique à la première électrode, dans lequel une chambre de cathode (5) est agencée entre la première électrode (2) et la paroi de membrane (4) et une chambre d'anode (6) est agencée entre la seconde électrode (3) et la paroi de membrane (4) et deux bagues d'étanchéité, une bague supérieure (7) et une bague inférieure (8) agencées aux extrémités des deux électrodes (2) et (3), dans lequel la bague inférieure (8) présente un canal d'entrée des électrolytes vers la chambre de cathode (9) et un canal d'entrée des électrolytes vers la chambre d'anode (10) et la bague supérieure (7) présente un canal de sortie des électrolytes à partir de la chambre d'anode (11) et un canal de sortie des électrolytes à partir de la chambre de cathode (12), dans lequel 65 Dd / Ds ≤ K / ln L ≤ 25 Db / Ds 0,6 ≤ Ss / Sb ≤ 1,9
    Figure imgb0007
     Db étant la mesure du diamètre interne de la seconde électrode de forme tubulaire et de section circulaire (anode), Db allant de 0,1 Ds à 0,7 Ds, Ds étant la mesure du diamètre interne de la première électrode de forme tubulaire et de section circulaire (cathode), Dd étant la mesure du diamètre interne de la paroi de membrane, Dd allant de 0,15 Ds à 0,8 Ds, K la mesure de la distance entre les électrodes, L étant la mesure de la distance entre les canaux d'entrée et de sortie des électrodes, Ss étant la mesure de l'aire de la section transversale de la chambre de cathode, Sb étant la mesure de l'aire de la section transversale de la chambre d'anode ;
    une chambre de stagnation (13) de forme sphéroïdale ouverte sur la chambre de cathode (5) et positionnée à l'intersection entre la chambre de cathode (5) et le canal de sortie des électrolytes à partir de la chambre de cathode (12),
    et raccordée au canal de sortie des électrolytes à partir de la chambre cathodique (12) par un tuyau de raccordement (14) dans lequel r < D < 3r et d < r < 3d, D étant la mesure du diamètre du collecteur de sortie de la chambre de cathode, r étant la mesure du rayon de la chambre de stagnation, d étant la mesure du diamètre du tuyau de raccordement.
  2. Dispositif électrochimique selon la revendication 1, dans lequel la paroi de membrane (4) est une membrane échangeuse d'ions.
  3. Dispositif électrochimique selon la revendication 1, dans lequel la section de la seconde électrode de forme tubulaire et de section circulaire (anode) est uniforme par rapport aux filetages supérieur et inférieur de la bague, qui est pourvue d'une ouverture coaxiale pour la seconde électrode de forme tubulaire et section circulaire (anode), deux câbles de forme cylindrique pour placer la paroi de membrane et la première électrode de forme tubulaire et de section circulaire (cathode).
  4. Utilisation du dispositif selon l'une quelconque des revendications précédentes pour la préparation d'acide hypochloreux (HOCl) à partir d'eau et de sels de chlorure.
EP18738319.5A 2017-07-21 2018-07-10 Dispositif électrochimique pourvu d'une chambre de stagnation Active EP3662096B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000083520A IT201700083520A1 (it) 2017-07-21 2017-07-21 Dispositivo elettrochimico dotato di camera di ristagno
PCT/EP2018/068637 WO2019016028A1 (fr) 2017-07-21 2018-07-10 Dispositif électrochimique pourvu d'une chambre de stagnation

Publications (2)

Publication Number Publication Date
EP3662096A1 EP3662096A1 (fr) 2020-06-10
EP3662096B1 true EP3662096B1 (fr) 2021-06-02

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Country Status (5)

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EP (1) EP3662096B1 (fr)
ES (1) ES2880528T3 (fr)
IT (1) IT201700083520A1 (fr)
MA (1) MA49738A (fr)
WO (1) WO2019016028A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3390065A (en) * 1964-04-03 1968-06-25 Hal B.H. Cooper Process and cell for the manufacture of either sodium hypochlorite or chlorine
JPS57194273A (en) 1981-05-26 1982-11-29 Asahi Glass Co Ltd Production of hydrogen
RU2104961C1 (ru) 1997-03-11 1998-02-20 Харрисон Инвестментс Лтд. Электрохимическая установка
EE05447B1 (et) * 2007-04-30 2011-08-15 Ilt�enko Valeri Kahekambrilise koaksiaalse elektrolseri protsessiseadis
EE05608B1 (et) * 2010-12-30 2012-12-17 Ilt�enko Valeri Meetod ja seade desinfektsioonivahendi saamiseks
DE102011053142B4 (de) 2011-08-31 2015-12-24 Kumatec Sondermaschinenbau & Kunststoffverarbeitung Gmbh Elektrolyseur und Elektrolyseur-Anordnung

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ES2880528T3 (es) 2021-11-24
WO2019016028A1 (fr) 2019-01-24
EP3662096A1 (fr) 2020-06-10
IT201700083520A1 (it) 2019-01-21
MA49738A (fr) 2020-06-10

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