EP3662096A1 - Dispositif électrochimique pourvu d'une chambre de stagnation - Google Patents

Dispositif électrochimique pourvu d'une chambre de stagnation

Info

Publication number
EP3662096A1
EP3662096A1 EP18738319.5A EP18738319A EP3662096A1 EP 3662096 A1 EP3662096 A1 EP 3662096A1 EP 18738319 A EP18738319 A EP 18738319A EP 3662096 A1 EP3662096 A1 EP 3662096A1
Authority
EP
European Patent Office
Prior art keywords
electrode
chamber
anode
cathode
cathode 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.)
Granted
Application number
EP18738319.5A
Other languages
German (de)
English (en)
Other versions
EP3662096B1 (fr
Inventor
Daniele MONTI
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.)
Nuova Control Systems Srl
Original Assignee
Nuova Control Systems Srl
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 Nuova Control Systems Srl filed Critical Nuova Control Systems Srl
Publication of EP3662096A1 publication Critical patent/EP3662096A1/fr
Application granted granted Critical
Publication of EP3662096B1 publication Critical patent/EP3662096B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • C25B1/24—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

  • Electrochemical device provided with stagnation chamber
  • 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 German patent application Nr. DE201011053142 describes an electrolytic cell to produce hydrogen and oxygen from the electrolytic decomposition of water which comprises a housing, electrodes, connected at the poles to a current source, and separated from one another by a membrane which divides into two the electrolytic cell, above the electrolytic cell there is a gas separation chamber, which is useful to separate oxygen and hydrogen from the gas-liquid mixture, and another chamber including a drop separator above the gas separation chamber for the additional purification of water or oxygen.
  • the different chambers are arranged vertically and separated by horizontal partition walls having pores allowing the passage of the liquid-gas mixture and the liquid dropping.
  • 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 European patent application Nr. EP0922788 describes an electrochemical device for the gas production from aqueous solutions, constituted by two vertical and coaxial cylindrical electrodes arranged between the two bushings characterized by a structure and an arrangement which allows a helical-like motion of the electrolytes inside the electrolytic chambers. This is determined by the presence of tilted channels and helical-like guiding elements in the bushings. In particular the starting solution enters on the lower side and through the helical-like guiding elements moves in the electrolytical chambers towards the upper portion wherein the products outgo through the tilted channels of the upper bushing. In this way the ejection of the liquid and gaseous products is facilitated and it is avoided that a gas stopping area in the electrolytic chambers is formed.
  • 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.
  • Figure 1 shows a longitudinal section of the device.
  • Figure 2 shows a longitudinal section of the detail of the stagnation chamber.
  • Figure 3 shows a three-dimensional representation of the device.
  • the electrochemical device 1 of the present invention comprising: two electrodes, a first electrode with tubular shape and circular section (cathode) 2 and a second electrode with tubular shape and circular section (anode) 3, arranged inside the first electrode 2 and coaxial thereto, to form a space between the two electrodes being divided in two chambers by a membrane wall 4 concentric to the first electrode, wherein a cathode chamber 5 is arranged between the first electrode 2 and the membrane wall 4 and an anode chamber 6 is arranged between the second electrode 3 and the membrane wall 4 and two sealing bushings, an upper bushing 7 and a lower bushing 8 arranged at the ends of the two electrodes 2 and 3, wherein the lower bushing 8 has an inlet channel of the electrolytes to the cathode chamber 9 and an inlet channel of the electrolytes to the anode chamber 10 and the upper bushing 7 has an outlet channel of the electrolytes from the anode chamber 11 and an outlet channel of the electroly
  • Db being the internal diameter measurement of the second electrode with tubular shape and circular section (anode), Db being from 0.1 Ds to 0.7 Ds,
  • Ds being the internal diameter measurement of the first electrode with a tubular shape with circular section (cathode)
  • Dd being the internal diameter measurement of the membrane wall, Dd being from 0.15 Ds to 0.8 Ds;
  • L being the measurement of the distance between the inlet and outlet channels of the electrodes
  • Ss being the measurement of the area of the cross section of the cathode chamber
  • Sb being the measurement of the area of the cross section of the anode chamber
  • the present invention relates to, the electrolytes from the inlet channel in the lower bushing enter the lower portion of the (outer) cathode chamber delimited by the wall of the electrode with cylindrical shape and by the ion exchange membrane; from this point they move through the cathode chamber towards the upper bushing wherein they direct towards the outlet channel of the electrolysis products, crossing the stagnation area which characterizes the present invention.
  • the device is used for the preparation of hypochlorous acid (HOC1) from water and chloride salts.
  • the gas for example H 2 , which forms in the stagnation chamber 13 is removed from the cathode chamber 5, by the connector pipe 14.
  • 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 lower and upper bushings are sealed by means of seals made of rubber positioned under the ion exchange membrane and the cylinder-shaped electrode, apart from the sealing ring existing around the bar-shaped electrode .
  • 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 electrochemica device of the present invention is used for the preparation o hypochlorous acid (HOC1) from water and sodium chloride (NaCl) .
  • HOC1 hypochlorous acid
  • NaCl sodium chloride

Landscapes

  • 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)

Abstract

L'invention concerne un dispositif électrochimique comportant deux électrodes verticales coaxiales et une membrane interposée entre les deux électrodes fermées par deux bagues disposées aux extrémités des deux électrodes, se caractérisant par la présence d'une chambre de stagnation de forme sphéroïdale.
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 true EP3662096A1 (fr) 2020-06-10
EP3662096B1 EP3662096B1 (fr) 2021-06-02

Family

ID=60451009

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18738319.5A Active EP3662096B1 (fr) 2017-07-21 2018-07-10 Dispositif électrochimique pourvu d'une chambre de stagnation

Country Status (5)

Country Link
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

Also Published As

Publication number Publication date
EP3662096B1 (fr) 2021-06-02
IT201700083520A1 (it) 2019-01-21
ES2880528T3 (es) 2021-11-24
MA49738A (fr) 2020-06-10
WO2019016028A1 (fr) 2019-01-24

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