GB1518846A - Treatment of electrolysis cell membrane - Google Patents

Treatment of electrolysis cell membrane

Info

Publication number
GB1518846A
GB1518846A GB40153/75A GB4015375A GB1518846A GB 1518846 A GB1518846 A GB 1518846A GB 40153/75 A GB40153/75 A GB 40153/75A GB 4015375 A GB4015375 A GB 4015375A GB 1518846 A GB1518846 A GB 1518846A
Authority
GB
United Kingdom
Prior art keywords
treatment
membrane
deposits
electrolysis
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.)
Expired
Application number
GB40153/75A
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.)
Occidental Chemical Corp
Original Assignee
Hooker Chemicals and Plastics Corp
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 Hooker Chemicals and Plastics Corp filed Critical Hooker Chemicals and Plastics Corp
Publication of GB1518846A publication Critical patent/GB1518846A/en
Expired 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
    • C25B13/00—Diaphragms; Spacing elements
    • 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
    • C25B1/34—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis
    • C25B1/46—Simultaneous production of alkali metal hydroxides and chlorine, oxyacids or salts of chlorine, e.g. by chlor-alkali electrolysis in diaphragm cells
    • 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
    • C25B15/00—Operating or servicing cells

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)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

1518846 Rejuvenation of electrolysis membranes HOOKER CHEMICALS & PLASTICS CORP 1 Oct 1975 [29 Oct 1974] 40153/75 Heading C7B An ion-exchange membrane which has been used to define part of the anode compartment of an NaCl electrolysis cell is rejuvenated by treatment with acid at pH 0À2 to 2À5 and below the working electrolyte pH to remove deposits from its anodic side. The membrane may be a cation selective fluoropolymer e.g. a laminated membrane with different cation-selective activity on each side, or having an SO 3 H gradient across its thickness. Treatment may be in situ in which case normal electrolysis is modified by acidifying the anolyte, reducing the current density, and diluting the NaOH on the cathodic side. If the membrane is removed from the cell it may first be treated in a glycerol/brine solution to prevent shrinkage. The deposits removed are Ca, Mg and possibly Fe oxides, hydroxides, chlorides and complexes and should also be removed from the cell base by flushing. Entrained deposits are either filtered out or, if dissolved, chemically precipitated. Treatment acids include HCI, H 2 SO 4 , H 3 PO 4 , citric, gluconic and mixtures.
GB40153/75A 1974-10-29 1975-10-01 Treatment of electrolysis cell membrane Expired GB1518846A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US51890374A 1974-10-29 1974-10-29

Publications (1)

Publication Number Publication Date
GB1518846A true GB1518846A (en) 1978-07-26

Family

ID=24065966

Family Applications (1)

Application Number Title Priority Date Filing Date
GB40153/75A Expired GB1518846A (en) 1974-10-29 1975-10-01 Treatment of electrolysis cell membrane

Country Status (11)

Country Link
JP (1) JPS5167292A (en)
BE (1) BE834908A (en)
CA (1) CA1105876A (en)
DE (1) DE2548456A1 (en)
FI (1) FI60577C (en)
FR (1) FR2333058A1 (en)
GB (1) GB1518846A (en)
IT (1) IT1043667B (en)
NL (1) NL7512519A (en)
NO (1) NO753618L (en)
SE (1) SE425323B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52149295A (en) * 1976-06-08 1977-12-12 Tokuyama Soda Co Ltd Protecting method for electrolytic bath
JPS5312798A (en) * 1976-07-22 1978-02-04 Tokuyama Soda Co Ltd Electrolyzing eqiupment for aqueous solution of alkali metal salt

Also Published As

Publication number Publication date
SE7512049L (en) 1976-04-30
FI752923A (en) 1976-04-30
BE834908A (en) 1976-04-27
CA1105876A (en) 1981-07-28
FI60577C (en) 1982-02-10
IT1043667B (en) 1980-02-29
JPS5167292A (en) 1976-06-10
NO753618L (en) 1976-04-30
NL7512519A (en) 1976-05-04
DE2548456A1 (en) 1976-05-13
FR2333058A1 (en) 1977-06-24
FI60577B (en) 1981-10-30
SE425323B (en) 1982-09-20

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee