EP2765221A1 - Procédé électrolytique de production d'agent de blanchiment - Google Patents

Procédé électrolytique de production d'agent de blanchiment Download PDF

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Publication number
EP2765221A1
EP2765221A1 EP13154764.8A EP13154764A EP2765221A1 EP 2765221 A1 EP2765221 A1 EP 2765221A1 EP 13154764 A EP13154764 A EP 13154764A EP 2765221 A1 EP2765221 A1 EP 2765221A1
Authority
EP
European Patent Office
Prior art keywords
electrodes
sodium chloride
sodium hypochlorite
current efficiency
cell
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.)
Ceased
Application number
EP13154764.8A
Other languages
German (de)
English (en)
Inventor
designation of the inventor has not yet been filed The
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.)
Unilever NV
Original Assignee
Unilever NV
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 Unilever NV filed Critical Unilever NV
Priority to EP13154764.8A priority Critical patent/EP2765221A1/fr
Publication of EP2765221A1 publication Critical patent/EP2765221A1/fr
Ceased legal-status Critical Current

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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

Definitions

  • the present invention relates to a method for production of sodium hypochlorite.
  • the concentration of sodium chloride increases, the quantity of sodium hypochlorite increases. Further preferably, as the concentration of sodium chloride increases, it is preferred to increase the time interval between two cycles.
  • the concentration of sodium chloride in particularly, chloride ions
  • the current efficiency increases, however, over a period of time, the platinum electrode gets oxidised by water oxidation.
  • the water oxidation reaction competes with the desired reaction of oxidation of chloride ions to chlorine. A part of the current gets utilised in the side reaction of water oxidation, therefore the current efficiency gradually decreases beyond the upper limit of the most preferred range, that is, beyond 3.5 M.
  • the method is carried out at temperature below 35°C, more preferably 25 to 30°C. With an increase in the temperature the hypochlorite ions tend to get converted into chloride ions. Therefore, when the method is conducted below 35°C, the probability and extent of the competing side reaction can be minimised.
  • the disclosed invention is applicable to in-situ production of sodium hypochlorite which has various applications such as treatment of drinking water/swimming pool water/industrial waste water, washing of textiles/stained or soil fabrics; sterilization of food processing equipments, sterilization of packages.
  • Example 1 Schematic diagram of an electrolytic cell for carrying out a preferred method
  • c(t) represents concentration of sodium hypochlorite in the reservoir at time t and Q ( t ) is the quantity of electric charge passed through the cell up to t.
  • V, A and F respectively represent the volume of the reservoir, the (geometric) surface area of the electrode and Faraday constant.
  • Table 1 Time/seconds Cumulative production of sodium hypochlorite Current efficiency/% Direct current Switching Direct current Switching 1800 0.9 4.0 76.0 95.2 3600 1.1 8.0 72.1 95.2 5400 1.3 10.4 63.0 91.6 7200 1.5 13.5 59.0 85.8 9000 1.6 15.5 55.0 82.0 10800 1.8 18.0 52.0 80.0
  • the aim of this experiment was to find out the effect of time taken to switch the polarity of electrodes on the cumulative production of sodium hypochlorite. Another aim of this experiment was to find out the effect of time taken to switch the polarity of electrodes on the current efficiency.
  • the cell potential was maintained at 2.65 V, the flow rate of sodium chloride solution was maintained at 100 ml/minute, the concentration of sodium chloride was fixed at 0.5 M. The volume of sodium chloride was 100 ml. The experiment was conducted for 15 minutes.
  • the aim of this experiment was to find out the effect of concentration of sodium chloride on the cumulative production of sodium hypochlorite.
  • Another aim of this experiment was to find out the effect of concentration of sodium chloride on the current efficiency.
  • the data in table 3 indicates that as the concentration of sodium chloride increases, the current efficiency and cumulative production of sodium hypochlorite increases.
  • the data in table 4 indicates that as the electrode potential increases the production of sodium hypochlorite increases but the current efficiency decreases.
  • the current efficiency is very high at low cell potential as compared to higher cell potential.
  • the illustrated examples indicate that not only do the electrodes last longer but also they remain highly current efficient during most of their life time.
  • the illustrated examples also make it possible to achieve high rate of production and high current efficiency compared to the conventional cells which use DSA.

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)
EP13154764.8A 2013-02-11 2013-02-11 Procédé électrolytique de production d'agent de blanchiment Ceased EP2765221A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13154764.8A EP2765221A1 (fr) 2013-02-11 2013-02-11 Procédé électrolytique de production d'agent de blanchiment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13154764.8A EP2765221A1 (fr) 2013-02-11 2013-02-11 Procédé électrolytique de production d'agent de blanchiment

Publications (1)

Publication Number Publication Date
EP2765221A1 true EP2765221A1 (fr) 2014-08-13

Family

ID=47739089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13154764.8A Ceased EP2765221A1 (fr) 2013-02-11 2013-02-11 Procédé électrolytique de production d'agent de blanchiment

Country Status (1)

Country Link
EP (1) EP2765221A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105417646A (zh) * 2015-12-31 2016-03-23 成都飞创科技有限公司 一种电化杀菌水处理器

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234110A (en) 1959-02-06 1966-02-08 Amalgamated Curacao Patents Co Electrode and method of making same
US3436320A (en) * 1965-05-20 1969-04-01 Union Oil Co Method and apparatus for determination of redox current in redox solutions
US4908109A (en) * 1985-10-24 1990-03-13 Mercer International, Inc. Electrolytic purification system utilizing rapid reverse current plating electrodes
FR2644155A1 (fr) * 1989-03-07 1990-09-14 Levart Michel Appareil de sterilisation electrolytique des eaux
US5314589A (en) * 1992-10-15 1994-05-24 Hawley Macdonald Ion generator and method of generating ions
US20030042134A1 (en) * 2001-06-22 2003-03-06 The Procter & Gamble Company High efficiency electrolysis cell for generating oxidants in solutions
US20030121798A1 (en) * 2001-11-30 2003-07-03 Masahiro Iseki Water treating method, water treating apparatus, and hydroponics system using the apparatus
US20030213704A1 (en) * 2002-05-17 2003-11-20 The Procter & Gamble Company Self-contained, self-powered electrolytic devices for improved performance in automatic dishwashing
WO2007032577A1 (fr) * 2005-09-14 2007-03-22 Korea Ocean Research And Development Institute Appareil de stérilisation électrolytique pour eau de ballast de bateau

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234110A (en) 1959-02-06 1966-02-08 Amalgamated Curacao Patents Co Electrode and method of making same
US3436320A (en) * 1965-05-20 1969-04-01 Union Oil Co Method and apparatus for determination of redox current in redox solutions
US4908109A (en) * 1985-10-24 1990-03-13 Mercer International, Inc. Electrolytic purification system utilizing rapid reverse current plating electrodes
FR2644155A1 (fr) * 1989-03-07 1990-09-14 Levart Michel Appareil de sterilisation electrolytique des eaux
US5314589A (en) * 1992-10-15 1994-05-24 Hawley Macdonald Ion generator and method of generating ions
US20030042134A1 (en) * 2001-06-22 2003-03-06 The Procter & Gamble Company High efficiency electrolysis cell for generating oxidants in solutions
US20030121798A1 (en) * 2001-11-30 2003-07-03 Masahiro Iseki Water treating method, water treating apparatus, and hydroponics system using the apparatus
US20030213704A1 (en) * 2002-05-17 2003-11-20 The Procter & Gamble Company Self-contained, self-powered electrolytic devices for improved performance in automatic dishwashing
WO2007032577A1 (fr) * 2005-09-14 2007-03-22 Korea Ocean Research And Development Institute Appareil de stérilisation électrolytique pour eau de ballast de bateau

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105417646A (zh) * 2015-12-31 2016-03-23 成都飞创科技有限公司 一种电化杀菌水处理器

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