US2281090A - Electrolytic manufacture of potassium persulphate - Google Patents

Electrolytic manufacture of potassium persulphate Download PDF

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Publication number
US2281090A
US2281090A US199294A US19929438A US2281090A US 2281090 A US2281090 A US 2281090A US 199294 A US199294 A US 199294A US 19929438 A US19929438 A US 19929438A US 2281090 A US2281090 A US 2281090A
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United States
Prior art keywords
potassium
cell
persulphate
electrolyte
potassium persulphate
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Expired - Lifetime
Application number
US199294A
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English (en)
Inventor
Salleras Modesto
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.)
BUFFALO ELECTRO CHEM CO
BUFFALO ELECTRO-CHEMICAL COMPANY Inc
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BUFFALO ELECTRO CHEM CO
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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
    • C25B1/29—Persulfates

Definitions

  • This invention relates to a process and to an electrolytic cell without ⁇ a diaphragm by means of whichpotassium persulphate may be obtained directly from potassium sans with ⁇ an energy eiliciency greater than that of the known processes.
  • Thisimproved electrolyte has a strong concentration of KS04 ion and H804 ion and a correspondingly good conductivity.
  • Thegenergy consumption may be only 1.3 kilowatt-hours per kilo of potassium persulphate, the anodic current density being ⁇ 0.5 amp. per square cin.4 'I'he use of this electrolyte results therefore in "a very good current and energy efilciency.
  • Examples of the y electrolyte of the present invention in which the potassium ⁇ persulphate is substantially insoluble are 3 moles-of potassium bisulphate (KI-1804) and one mole of sulphuric acid (H2804) with sufilcient water to give the following' composition: ⁇
  • the electrolyte may also be ⁇ prepared from 1 other combinations of salts ofthe potassium and sulphate radicals, for example. by preparing a saturated aqueoussolution of potassium tetra- Asulphate KzSiOnBHzO and potassium bisulphate KHSO4 in the proportion of one mole of the former and two moles of the latter.
  • the ⁇ above examples relate to a temperature of 15 C. but the composition of the electrolyte is varied slightly with variation of temperature, but so that the potassium persuiphate is sub. stantially insoluble in the electrolyte.'
  • the ⁇ electrolytic cell ⁇ comprises a substantially horizontal cathode of graphite in the form of a rectangular frame made upv of two long side plates and two short end plates or distance pieces.
  • the anode is formed by a row of vertical wires generally of platinum or indium-platinum, placed in the middle longitudinall line of the cathode frame.
  • the Wires are soldered or weldedto an iron frame covered by ebonite and fixedto the cathode to form a block which is supported as a.
  • aconstant supplyl of e1eotro1yte is maintained at the iower part of the-cell and a constant discharge is provided at its upper part. 'I'he speed of upward flow of the ⁇ electrolyte and the compressed air forced into the electrolyte avoid the deposition of potassium persulphateat the bottom of the cell. y
  • Fig. 1 is a diagram of the cyclic process
  • n uFig. 2 is a vertical cross section through the ce
  • Fig. 3 is a horizontal longitudinal section 'on 'line III-III 0f Fig. 2.
  • the electrolyte flows by pipe Il to the lower part of the electrolysis cell l2, from the upper part'of which it passes through pipe I3 to a refrigerator Il andthence through pipe I5 to a lllter I6.
  • the liquid leaving the iilter Itlpasses through pipe i1 finto the saturator IB where it receives any,
  • Pump 20 draws the regenerated elec- ⁇ trolyte throughl pipe i9 and delivers it through pipe 2l to the tank III.
  • the cell I 2 ⁇ is pref- 60 erably constructed of stoneware and 'is shaped internally to form a support 22 for the cathode composed of four thick plates 23, 24, 25, ⁇ 26 fastened together to form a rectangle commensurate in length and ⁇ Width with the internal length and width of the cell.
  • the means of assembling the plates (for instance screws)Y should be incapable of attack by the electrolyte.
  • the current is conducted to the cathode by a graphite rod 21.
  • the anode consists of wires 28, preferably of iridium-platinum, held vertically in a metal frame composed of longitudinalV members 29 and 30 and vertical members 3l, 32 encased in ebonite or other suitable insulation.
  • the lead for the current supply to the anode is shown at 34.
  • the pipe Il shown in Fig. 1 is extended as pipe 35 through the length of the lower part of the cell and is closed at its free end, the exit for the liquor being through perforations 36 along the topmost part of the pipe; thus the electrolyte'is fed uniformly throughout the length-of the cell.
  • a outflow pipe I3 is at about ⁇ the level of the upper member 29 of the anodic frame.
  • a porous diaphragm which comprises electro- ⁇ lyzing a substantially saturated aqueous solution of potassium bisulphate and sulphuric acid in substantially the mole relation of three molesof potassium bisulphate to one mole of sulphuric acid while maintaining such a temperature and continuing the electrolysis that a precipitate of potassium persulphate is produced, the solution subjected to electrolysis being continuously moved upwardly lbetween the electrolyzing electrodes and continuously removed fromI the cell at such a rate as to carry out the precipitated potassium persulphate and prevent deposition of the same in the cell or on the anode, compressed air being discharged into the solution passing between the electrodes to aid additionally in preventing deposition of solid potassium persulphate on the anode.
  • the continuousmethodof producingpotassium persulphate electrolytically without the'use of a porous diaphragmwhich comprises electrolyzing a substantially saturated aqueous solution of three .moles of potassium bisulphate and ilve moles of sulphuric acid whileg maintaining such a temperature and continuing the electrolysis that a precipitate of potassium persulphate is produced, the solution subjected to electrolysis being continuously moved upwardly between the electrolyzing electrodes and continuously removed from the cell at such a rate as to carry out the precipitated potassium persulphate and prevent deposition of the same in the cell or on the anode, compressed air being discharged into the solu-v tion passing between the electrodes to aid addi- 0 tionally inpreventing deposition of solid potassium persulphateon the anode.

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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)
US199294A 1937-03-31 1938-03-31 Electrolytic manufacture of potassium persulphate Expired - Lifetime US2281090A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR831012T 1937-03-31

Publications (1)

Publication Number Publication Date
US2281090A true US2281090A (en) 1942-04-28

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US199294A Expired - Lifetime US2281090A (en) 1937-03-31 1938-03-31 Electrolytic manufacture of potassium persulphate

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US (1) US2281090A (en)van)
FR (1) FR831012A (en)van)
NL (1) NL49236C (en)van)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2589982A (en) * 1947-05-12 1952-03-18 Porte Chemicals Ltd Electrolytic production of ammonium persulfate solutions
US3915816A (en) * 1973-09-18 1975-10-28 Peroxid Chemie Gmbh Process for the electrolytic production of sodium peroxodisulfate
FR2489129A1 (fr) * 1980-08-28 1982-03-05 Gen Electric Machine a cafe automatique perfectionnee
CN1049256C (zh) * 1993-04-08 2000-02-09 金属股份公司 碱金属过氧化物溶液的制备方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2589982A (en) * 1947-05-12 1952-03-18 Porte Chemicals Ltd Electrolytic production of ammonium persulfate solutions
US3915816A (en) * 1973-09-18 1975-10-28 Peroxid Chemie Gmbh Process for the electrolytic production of sodium peroxodisulfate
FR2489129A1 (fr) * 1980-08-28 1982-03-05 Gen Electric Machine a cafe automatique perfectionnee
CN1049256C (zh) * 1993-04-08 2000-02-09 金属股份公司 碱金属过氧化物溶液的制备方法

Also Published As

Publication number Publication date
NL49236C (en)van)
FR831012A (fr) 1938-08-18

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