Microtek
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P2O5 solvent
Just a quick question:
I'm looking for a nice inert solvent for P2O5 to eliminate some of the problems arising when working with this material. Specifically, the
solvent must be inert with respect to fuming HNO3 ( and preferably miscible with it ) as the P2O5 is needed for demanding nitrations such as
RRN-Ac --> RRN-NO2
Any help would be appreciated.
Edit: Corrections to the reaction.
[Edited on 20-2-2003 by Microtek]
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Polverone
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Hmm, I see that H2SO4 is listed as a solvent for it in Lange's Handbook, and it would certainly be inert to nitric acid too. But do you need a
sulfuric acid free mixture?
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rikkitikkitavi
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Oh, but P2O5 will react with H2SO4 and create SO3 and phosphoric acid. But I m sure this will be a equlibrium reaction, hard to tell actual equlibrium
composition though.
Perhaps a non-oxygen contaning solvent like MeCl2?
/rickard
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Polverone
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Ah, drat. But wouldn't MeCl2 be vulnerable to oxidation? Maybe CCl4 would do the trick.
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Microtek
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In that patent Xoo posted, they used chloroform as their preferred embodiment. I'm pretty sure CH2Cl2 would work as well ( at least it
doesn't react with the nitric; there's a method for extracting 100% HNO3 from H2SO4/HNO3 mixes. )
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DDTea
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A bit off topic- Could I ask you where you got P2O5? It's a very useful chemical, and I would really like to have some.
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Microtek
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From a lab supply. I function as a freelance researcher for a small business so I can get most chemicals except those labeled as poisonous, as they
require permits. It's very expensive though, so I try to make do with OTC chems.
BTW, I have tested nitromethane, and it seems to form a colloidal suspension of P2O5 without reacting with it. It also seems quite inert to HNO3.
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roamingnome
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super phosphate fertilizer says P2O5 on the back
white granuals
for some reason this isnt the stuff i think its is?
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Mr. Wizard
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| Quote: | Originally posted by roamingnome
super phosphate fertilizer says P2O5 on the back
white granuals
for some reason this isnt the stuff i think its is? |
You are right to doubt. It lists what the fertilizer's equivalent is for P2O5, so you can compare it's strength to another brand or compound. I doubt
it would EVER contain free P2O5.
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