Na2S2O8 (and other persulfate salts) are produced by
electrolysis of almost saturated Na2SO4 + sulfuric acid at low
temperatures (~0°C) and very high anode current densities. The
Na2S2O8 produced at the anode is less soluble than Na2SO4 and
thus collected as a precipitate.
I doubt it would be worth your while regenerating spent
persulfate etchant on a small scale. There are other
regeneratable etching chemistries to play with.
Radek Zitek wrote:
> I have tried to use the natrium persulfate (Na2S2O8) for etching and
> remember reading somewhere that it can be regenerated. Any pointers
> where I could find more...
>
> Thanks, Radek
>
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