DFliyerz
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Recycling Phosphorus Pentoxide
Phosphorus pentoxide is a very useful dehydrating agent, but also fairly hard to get. When it's used, it turns into phosphoric acid, which is sort of
useless. Is there any way to recycle the phosphoric acid back into phosphorus pentoxide or a lower oxide of phosphorus?
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Boffis
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No. At least not home-chemist friendly routes.
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DFliyerz
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Out of purely scientific interest, what are the non home-chemist friendly routes?
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BromicAcid
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If you heat the snot out of it you can work your way back to metaphosphoric acid which is a good dehydrating agent in its own right:
http://www.sciencemadness.org/talk/viewthread.php?tid=4409
Otherwise you have to reduce it back to phosphorus and then oxidize it again.
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zed
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Seems to me, you can dehydrate phosphoric acid to PPA via microwave oven and vacuum. I don't know if you can achieve Phosphorus Pentoxide status
however.
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