US2297252A - Process for the purification of solutions that serve as generators for percompounds - Google Patents

Process for the purification of solutions that serve as generators for percompounds Download PDF

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Publication number
US2297252A
US2297252A US214245A US21424538A US2297252A US 2297252 A US2297252 A US 2297252A US 214245 A US214245 A US 214245A US 21424538 A US21424538 A US 21424538A US 2297252 A US2297252 A US 2297252A
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US
United States
Prior art keywords
solutions
cell
cathode
persulfate
solution
Prior art date
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Expired - Lifetime
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US214245A
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English (en)
Inventor
Schmidt Heinrich
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Individual
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Individual
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Filing date
Publication date
Priority to DESCH112060D priority Critical patent/DE753434C/de
Priority to CH204843D priority patent/CH204843A/de
Priority to GB10544/38A priority patent/GB509175A/en
Priority to FR836493D priority patent/FR836493A/fr
Priority to NL88182A priority patent/NL49589C/xx
Application filed by Individual filed Critical Individual
Priority to US214245A priority patent/US2297252A/en
Application granted granted Critical
Publication of US2297252A publication Critical patent/US2297252A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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

Definitions

  • More particularly it relates to a process for the purification and reoxidation of solutions used in a cyclic process for the production of hydrogen peroxide.
  • the residual liquor remaining after distillation contains valuable constituents and is, therefore, returned to electrolytic cells for reoxidation to persulfuric acid or persulfate as the case may be.
  • the residual liquor obtained after such distillation also contains impurities, such as Caros acid (H2805), hydrogen peroxide itself and metallic impurities which act as catalysts, it has not previously been possible to carry out this reoxidation in a simple diaphragmless cell in which both anode and cathode are in a common chamber.
  • a further object of this invention is to provide a. suitable cell in which this process may be carried out ly.
  • Another object is to provide a process for the consideration of the specification and the claims and persulfates for the purpose of obtaining hydrogen peroxide therefrom.
  • the residual solution obtained as a result of the distillation step after its usual dil'ution to the proper concentration, is first subjected to a cathodic reduction to free the solution from impurities such as Caros acid, hydrogen peroxide, metallic catalytic impurities and the like which detrimentally afiect reoxidation and thereafter reoxidized in one or more simple diaphragmless cells to obtain for redistillation a solution containing the desired amount of persulfuric acid orpersulfate.
  • impurities such as Caros acid, hydrogen peroxide, metallic catalytic impurities and the like which detrimentally afiect reoxidation and thereafter reoxidized in one or more simple diaphragmless cells to obtain for redistillation a solution containing the desired amount of persulfuric acid orpersulfate.
  • the cathodic potential most suitable for purification is obtained by a careful selection of cathode material, current density, cell resistance and speed of flow of the solution.
  • the most suitable potential is preferably such that the impurities are reduced without appreciable reduction of the persulfate.
  • the reduction itself is, therefore, carried out without any substantial change of concentration of persulfate with the result that the subsequent loss of oxygen during'distillation is minimized.
  • this reoxidation may be omitted if desired, in which case 'the purified' solution leaving the cathod chamber is directly passed into theldiapliragmless cells for oxidation therein.
  • the solution may be purified by passing it through th cathode chambers of a number of cells in series, and then if desired through the anode chambers of the cells.
  • the cathode chamber of the diaphragm cell in v which the purification takes place may be of any desired construction or design.
  • a diaphragm in the form of plates or the like may be built into the cell container to separate the two chambers.
  • a cell particularly adaptable for use is shown in cross section in the accompanying drawing wherein casing 'I made of any suitable material contains a separated concentric cylindrical diaphragm 2, the outlet pipe 3 of which passes through an opening in the container to v which it is sealed at point 4.
  • the cylindrical diaphragm 2 forms the enclosure for the cylinas theoperating time increases.
  • drical anode chamber a which is connected with annular cathode chamber b by a series of holes 5 near its bottom.
  • the cathode 5 surrounds the diaphragm 2 inside of which there is an anode I also of cylindrical shape.
  • the electrolyte is introduced into the cathode chamber b at point c As a direct result of the present invention, it
  • the diluted residue is uniformly passed through the cathode chambers of four cells in parallel and electrolyzed in each cell with a current of 2 amperes using a cathode current density of 0.01-0.02 ampere per square centimeter and an anode current density of 1.0 ampere per square centimeter at a temperature not above 20 (3'.
  • persulfate as used herein includes persulfuric acid as well asthe persulfates such as the ammonium, potassium and sodium salts.
  • the reoxidation in the diaphragmless cell may be defined as exposing the solution to simultaneous anodic oxidation and cathodic reduction to oxidize the solution to obtain the desired concentration of persulfate.”
  • a continuous cyclic process for electrolytically producing hydrogen peroxide by distillation from a persulfate solution comprising distilling off the hydrogen peroxide therefrom, diluting the residual liquid, purifying the diluted liquid by subjecting it to cathodic reduction in the cathode chamber of at least one diaphragm cell in which the cathode potential is maintained suflicient to reduce the impurities in the solution without appreciably reducing the persulfate present-and subsequently reoxidizing the'so purified liquid by passingit through at least one diaphragmless cell wherein it is exposed to current conditions efiective for auodic oxidation to persulfates of high concentration.

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  • 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)
US214245A 1937-02-13 1938-06-17 Process for the purification of solutions that serve as generators for percompounds Expired - Lifetime US2297252A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DESCH112060D DE753434C (de) 1937-02-13 1937-02-13 Verfahren zur Reinigung von Loesungen, die zur Erzeugung von Perverbindungen dienen
CH204843D CH204843A (de) 1937-02-13 1938-04-01 Verfahren und Vorrichtung zur Reinigung von Lösungen, die zur Erzeugung von Perverbindungen dienen.
GB10544/38A GB509175A (en) 1937-02-13 1938-04-06 Improvements in or relating to the purification of solutions in a circulation process for the electrolytic production of hydrogen peroxide
FR836493D FR836493A (fr) 1937-02-13 1938-04-11 Procédé et dispositif pour la purification de solutions qui servent à la production de percomposés
NL88182A NL49589C (enrdf_load_stackoverflow) 1937-02-13 1938-06-04
US214245A US2297252A (en) 1937-02-13 1938-06-17 Process for the purification of solutions that serve as generators for percompounds

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DESCH112060D DE753434C (de) 1937-02-13 1937-02-13 Verfahren zur Reinigung von Loesungen, die zur Erzeugung von Perverbindungen dienen
CH204843T 1938-04-01
GB10544/38A GB509175A (en) 1937-02-13 1938-04-06 Improvements in or relating to the purification of solutions in a circulation process for the electrolytic production of hydrogen peroxide
FR836493T 1938-04-11
NL88182A NL49589C (enrdf_load_stackoverflow) 1937-02-13 1938-06-04
US214245A US2297252A (en) 1937-02-13 1938-06-17 Process for the purification of solutions that serve as generators for percompounds

Publications (1)

Publication Number Publication Date
US2297252A true US2297252A (en) 1942-09-29

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ID=25993738

Family Applications (1)

Application Number Title Priority Date Filing Date
US214245A Expired - Lifetime US2297252A (en) 1937-02-13 1938-06-17 Process for the purification of solutions that serve as generators for percompounds

Country Status (6)

Country Link
US (1) US2297252A (enrdf_load_stackoverflow)
CH (1) CH204843A (enrdf_load_stackoverflow)
DE (1) DE753434C (enrdf_load_stackoverflow)
FR (1) FR836493A (enrdf_load_stackoverflow)
GB (1) GB509175A (enrdf_load_stackoverflow)
NL (1) NL49589C (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431948A (en) * 1943-11-01 1947-12-02 Gen Motors Corp Apparatus for electrodepositing metal on bearing shells and the like
US3462351A (en) * 1967-01-30 1969-08-19 Kimberly Clark Co Process for alkaline peroxide solution production including alkali concentration control
US3506560A (en) * 1967-01-30 1970-04-14 Kimberly Clark Co Electrolytic cell having novel electrolyte flow path means

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL30269C (enrdf_load_stackoverflow) * 1930-02-20
DE548366C (de) * 1930-08-18 1932-04-11 Oesterr Chem Werke Vorrichtung zur elektrolytischen Behandlung von Fluessigkeiten

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431948A (en) * 1943-11-01 1947-12-02 Gen Motors Corp Apparatus for electrodepositing metal on bearing shells and the like
US3462351A (en) * 1967-01-30 1969-08-19 Kimberly Clark Co Process for alkaline peroxide solution production including alkali concentration control
US3506560A (en) * 1967-01-30 1970-04-14 Kimberly Clark Co Electrolytic cell having novel electrolyte flow path means

Also Published As

Publication number Publication date
FR836493A (fr) 1939-01-18
NL49589C (enrdf_load_stackoverflow) 1940-11-15
GB509175A (en) 1939-07-12
CH204843A (de) 1939-05-31
DE753434C (de) 1951-10-31

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