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Potassium Persulfate by Electrolysis of Potassium Bisulfate
Charlie

Yenziwe ngu-

Charlie

17. uMfumfu 2026DE
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Potassium Persulfate by Electrolysis of Potassium Bisulfate

Potassium persulfate, the initiator that starts emulsion polymerisation (PVA glue), is made by electrolysing a cold, concentrated potassium bisulfate solution at about 1 A/dm² on a platinum anode with a graphite cathode. Sulfate is oxidised to persulfate at the anode, and the sparingly soluble salt crystallises out. It is a strong oxidant: keep it away from organic matter. The picture: our diagram of the cell.
Ophakathi
One to several days

Imiyalelo

1

Make a strong, cold solution

Dissolve the potassium bisulfate in distilled water to a concentrated solution and keep it cold. A dilute solution gives oxygen instead of persulfate.

Izinto zokwakha zalesi sinyathelo:

I-potassium bisulfateI-potassium bisulfate400 g
Amanzi AcwengisisiweAmanzi Acwengisisiwe1 ilitha

Amathuluzi adingekayo:

Ithangi le-electrolysisIthangi le-electrolysis
Isikali Sedijithali SasekhishiniIsikali Sedijithali Sasekhishini
IthemomithaIthemomitha
Amagilavu Amelana NamakhemikhaliAmagilavu Amelana Namakhemikhali
Izibuko zokuphephaIzibuko zokuphepha
2

Electrolyse at high current density

Use a platinum anode and a graphite cathode. Run about 1 A per dm² of anode; hydrogen comes off at the cathode.

Amathuluzi adingekayo:

Ucingo lwe-platinumUcingo lwe-platinum
I-electrode ye-graphiteI-electrode ye-graphite
Umthombo kagesi we-DCUmthombo kagesi we-DC
Ithangi le-electrolysisIthangi le-electrolysis
IthemomithaIthemomitha
3

Collect the crystals

Potassium persulfate crystallises out as it forms. Filter it off, rinse with a little cold distilled water and dry it (our method).

Amathuluzi adingekayo:

I-funnel ye-Büchner (i-porcelain)I-funnel ye-Büchner (i-porcelain)
Iphepha LokuhluzaIphepha Lokuhluza
Ithileyi evulekile yokomisaIthileyi evulekile yokomisa
Amagilavu Amelana NamakhemikhaliAmagilavu Amelana Namakhemikhali
4

Use as initiator

For emulsion polymerisation, about 0.1–0.5 % is used, usually at 75–95 °C. Store it apart from organic materials.

Amathuluzi adingekayo:

Isikali Sedijithali SasekhishiniIsikali Sedijithali Sasekhishini
5

Charge and time

Ilayisha incwadi ye-Jupyter…

Izinto

2

Amathuluzi Adingekayo

11

Le blueprint yenza

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Isibambeli

I-initiator ye-persulfate

Free

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Ama-blueprint ahlobene

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Nitric Acid (Aquafortis) from Saltpetre and Oil of Vitriol, Ure 1839
Yingozi

Nitric Acid (Aquafortis) from Saltpetre and Oil of Vitriol, Ure 1839

ngu-CharlieDE

Inorganic

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Nickel Sheet by Electrowinning from Nickel Sulfate

Nickel Sheet by Electrowinning from Nickel Sulfate

ngu-CharlieDE

Inorganic

3
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