Electra
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Does anyone have any experience working with Persulfate compounds?
Persulfate, alongside Oxone/Monopersulfate are both strong oxidzers. Persulfate has a stronger oxidation potential, but is known to be more stable in
solution.
I had read bits, but haven't been able to find many reliable sources, stating that Persulfate is stable until it is heated. It allegedly decomposes
into the active oxidizing sulfate radicals above 50 degrees. Meaning, once activated by temperature it becomes extremely reactive. So for uses in
swimming pools and other applications, below the activation temperature it is extremely unreactive as an oxidant, but once activated, it becomes
extremely active?
Does anyone have any experience or information with this. Persulfate compounds, such as Ammonium Persulfate, are much more affordable and have much
higher solubility than Oxone.
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kristofvagyok
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I worked with potassium persulfate and ammonium persulfate. The potassium persulfate, since it's limited solubility, did not react under the reaction
conditions what I needed, the ammonium persulfate turned the whole reaction into a black gunk.
The title reaction in my case was an oxidation where I tried to turn furan into diacetoxy-dihydrofuran. At the end, potassium bromate was found to be
the optimal oxidant for the reaction.
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Electra
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My main interest is in the oxidation of halide ions, bromide, chloride, iodide, fluoride, etc. Oxone can oxidize these relatively easy and very
cleanly, with a mere water wash yielding a clean product.
Though, your black gunk comment concerns me. Do you know if this was caused by some cross-reaction reaction, or directly because of the ammonium
persulfate? Ammonium Persulfate after oxidation just yields Ammonium Sulfate, so I am not sure how that would directly cause black gunk.
Do you have any information with regard to speed of activation and heat needed for the activation of this persulfate?
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Magpie
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I used sodium persufate to oxidize benzyl alcohol to benzaldehyde:
http://www.sciencemadness.org/talk/viewthread.php?tid=26075
garage chemist used it to make SO3. See the Prepublication forum for his procedure.
[Edited on 1-6-2014 by Magpie]
The single most important condition for a successful synthesis is good mixing - Nicodem
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Electra
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Thanks for the link!
The main thing that concerns me is how exothermic the reaction is in comparison to oxone. I suppose it differs depending on the compound being
oxidized. I am hoping to oxidize bromide. Suppose I will just have to try to really know. The biggest thing about oxone is the horrible solubility. It
requires nearly 10x more water than ammonium persulfate.
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