Phosphorous Pentoxide

[10fingers]

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[This message has been edited by 10fingers (edited October 26, 2001).]

[deezs]

I'm sorry, but I must say, that your fertilizer contains no P2O5! It is Ca(H2PO4) and Ca3(PO4)2. 100 g contains as much phosphorous, as 18g P2O5.

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[CodeMason]

Correct, just as the % N rating doesn't mean the actual content of gaseous elemental nitrogen floating around in the bag. http://theforum.virtualave.net/ubb/smilies/smile.gif

[10fingers]

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[This message has been edited by 10fingers (edited October 26, 2001).]

[CodeMason]

The red strikers on safety match boxes contain around 50% red phosphorus and 50% coarse inert materials to arouse friction (such as glass and sand). Seeing as the material is inert, and shouldn't inhibit burning too much, if burning is all that's required to make phosphorus pentoxide from the element, this would be a good source.

[10fingers]

Thanx for the idea. I think it would take a lot of boxes though to get much. What about those strike anywhere type matches? I wonder if there isn't phosphorous on the tip of these.

[Anthony]

There's only chlorate in the match heads, it reacts with the phosphorus on the striker to ignite the head.

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[nbk2000]

Plain ammonium phosphate is best. Being a volatile salt (ammonium) it breaks down into phousphorus and ammonia under strong heating. Regular fire should be hot enough.

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[a_bab]

It'll decompose in some sort of phosphorus oxide and NH3, I would say. So no chance to make P in this way...The bones/C/SiO2 method is a better one http://theforum.virtualave.net/ubb/smilies/smile.gif

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http://move.to/pyromania

[10fingers]

Phosphorous pentoxide is the desired end result.
Isn't ammonium phosphate a common fertilizer? I'll see if I can find some and give it a try.

[CodeMason]

I beg to differ, for if there was only chlorate, the substance would fail to ignite when stripped off the match and set off in the open. Antimony (tri)sulfide is the fuel of choice.

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[nbk2000]

EXCUSE ME a_bab! http://theforum.virtualave.net/ubb/smilies/mad.gif

I'm assuming anyone with two nuerons in their skull isn't going to take just a sentence or two and try running with it. It's just a hint to get a person headed in the right direction.

With ammonium phosphate, you can use just plain carbon, and don't need the silica for flux.

And yes, it is a common fertilizer chem.
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[This message has been edited by nbk2000 (edited October 14, 2001).]

[Anthony]

Sorry, when I said "only chlorate" in a match head, I meant there's no phosphorus in it. IIRC an antimony compound is among a few other chems in match heads.

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[a_bab]

Yes NBK2000, you are right. I was wondering yesterday when I posted the message "will NBK2000 respond or not ?". My presumes comes true. Man, you have a strong character...

And you are right also with the carbon used as a reducer in order to abtain phosphorus without using SiO2.
Sorry...

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Damn, I got a nitro-headache again...

http://move.to/pyromania