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ÀWỌN OHUN WÍWỌ̀
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.
Àárín
One to several days
Ìlànà
1
1
Make a strong, cold solution
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Potassiọ̀mù bisulfate400 g
Omi Àyọ́1 lítàÀwọn irinṣẹ́ tí a nílò:
Agbada electrolysis
Òṣùwọ̀n Díjítà Ilé Ìdáná
Ẹ̀rọ Ìwọ̀n Ooru
Ìbọ̀wọ́ Tí Ń Kojú Kẹ́míkà
Gíláàsì ààbò2
2
Electrolyse at high current density
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.
Àwọn irinṣẹ́ tí a nílò:
Waya platinum
Elektrode graphite
Orísun iná DCAgbada electrolysisẸ̀rọ Ìwọ̀n Ooru3
3
Collect the crystals
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).
Àwọn irinṣẹ́ tí a nílò:
Funnel Büchner (porcelain)
Bébà Ìsẹ́
Àwo ìgbẹ̀ tí ó ṣíÌbọ̀wọ́ Tí Ń Kojú Kẹ́míkà4
4
Use as initiator
Use as initiator
For emulsion polymerisation, about 0.1–0.5 % is used, usually at 75–95 °C. Store it apart from organic materials.
Àwọn irinṣẹ́ tí a nílò:
Òṣùwọ̀n Díjítà Ilé Ìdáná5
5
Charge and time
Charge and time
Ń ṣí ìwé Jupyter…
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