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Author: Subject: Preparation of elemental phosphorus
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[*] posted on 4-9-2014 at 11:30


@nux vomica
What temperature are you heating the phosphorus mixture at in your forge? Also, how easy is it for you to reuse one of your retorts?
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[*] posted on 4-9-2014 at 23:15


Gdfp going by eye and looking at a temp chart it looks to be between 950 and 1000 C i have a 1200w element in it but i have a variable temp controller and its only putting out 1000w when running the forge, there seems to be no probs reusing the retorts just buff of any scale where you are welding, a tig can weld some pretty shitty covered steel if you have to but a cleaned up retort welds like new. cheers Scott
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[*] posted on 13-9-2014 at 02:43


Right the results are in but not sure how accurate they are, for the retort with lime i got 1.35 gms of phosphorus, and for no lime 1.75 grms, the no lime retort seemed to also be really reacting well as there was a lot of phosphorus being wasted and burning up in the air after passing through the water:mad: used a new element and think temp was to high measured at 945 deg c with probe, you get the same effect if you heat the outlet with a gas torch the phos seems to volatile and wont condense and just passes through the system, will play with settings when i get a chance cheers nuxy
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[*] posted on 25-9-2014 at 21:54


Had three more goes for the return of 2, 2.3, 2.65 grm phosphorus used a glass tube leading into the water and found the phosphorus condensed on the glass and will run down the tube if you heated gently with a gas torch occasionally much better way to do it.

Took a pic of map and coke mix didnt crush them up but mix and seal in retort, arc welded tube at home useing 2.5 m/s rods.

Cleaned all the phosphorus up in chromic sulfuric acid mix total is 15.48 grm dont even really need that much so might see if i can turn it into red phos seems a bit more usefull and stable than the white version cheers nuxy.

2014-09-19 14.05.21.jpg - 1.1MB 2014-09-19 14.09.10.jpg - 1.1MB 2014-09-19 14.21.35.jpg - 1.4MB 2014-09-19 15.21.20.jpg - 1.3MB 2014-09-19 18.02.17.jpg - 1MB 2014-09-20 14.41.04.jpg - 1MB

[Edited on 26-9-2014 by nux vomica]

[Edited on 26-9-2014 by nux vomica]
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[*] posted on 5-10-2014 at 20:44


Quote: Originally posted by j_sum1  
I'm late to the discussion and haven't read the whole thread so forgive me if this has been covered before.

If the purpose is to obtain a small sample for element collection (ie, volume created is not critical) then there is a straightforward method.

Red Phos can be gotten by scraping matchboxes after first loosening the glue with acetone. Tedious, impure, but possible.
Purifying and converting to white Phos is easy.
Place a small sample of red phos in a glass tube with sealed end or a small test tube.
Bung the other end with cotton wool or similar.
Heat the red phosphorus in a flame until it sublimes. It will deposit on the cotton wool. Removing the bung should demonstrate self ignition in air.
If you want to keep your sample then you need to use a longer glass tube. Place a cooling collar around the tube to force the phos to deposit in the location you desire. Then ampoule your sample by melting the tube on either side of the sample.

You won't get more than a few milligrams this way, but if that's all you need then this method is a cinch.


I'm pretty sure this is for larger amounts, like the ones nux vomica keeps producing above. It sounds as though this problem was cracked a couple of years ago; now all that remains is improving the syntheses that others have posted, and making them ever more accessible to the amateur chemist.




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[*] posted on 14-10-2014 at 18:42


Perhaps phosphorus trichloride could be reacted with a metal phosphide...?

AlP + PCl3 --> 1/2P4 + AlCl3

Let me know if this is a terrible idea.
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[*] posted on 24-10-2014 at 09:05


Quote: Originally posted by Azane  
Perhaps phosphorus trichloride could be reacted with a metal phosphide...?

AlP + PCl3 --> 1/2P4 + AlCl3


This raises the problem of trying to obtain PCl3. It can't be made by the standard industrial route because that uses phosphorous as a precursor, and it's controlled as a schedule 3 under the chemical weapons convention so I'm almost certain nobody will sell it to a non-corprate and non-government buyer.




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[*] posted on 25-10-2014 at 04:19
this worked


Hi...I thought i would like to share this after just finding this site..Ive just joined up now !

I have been fascinated by phosphorus for years and tried a few things that didnt work..however this did...
I got some phosphoric acid from a chemical company (Also easy to make,which i have, by digesting bone ash (used in pottery and available from pottery supplies) in H2SO4) heated it in a glass beaker over a gas burner (with mesh) until it smoked meaning it was dehydrated to pyro,or is it meta? let it cool...added about 10 times the amount of finely ground activated carbon (thats all I had on hand.I originally intended to use charcoal) then stuffed some of the really thick paste a third of the way into a quartz domestic heater element that i had taken the coil out of and rewound on the outside (I used a variac but other elements in series would give the possibly needed control) and heated it for about 2 hours.
When it was cold i took it into the dark and there it was...a faint glow of green...It glowed a lot more brightly when I blew into it displacing the phosgene and other gasses protecting it from the air...I was stoked !!!....Ive been meaning to do it on a big scale but been to busy.. From what i learned one needs to slope tube slightly upwards as goo melts before reducing and tries to run out..Block end in which you put reaction mixture with some sealer and start winding wire 2 inches from said end so you can keep a damp rag around sealer to prevent it burning..(I used urethane but fireclay would be way better and no wet live rag either !!..Hope someone likes this...I did !!
Im very happy to join your great site...thanks (-: Tim New Zealand
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[*] posted on 5-11-2014 at 08:06


Im not sure if preparation of black phosphorus crystals has been discussed but I'm very curious as to how it its created. I know extremely high pressure is applied or gas phase transport.
Please share some info or refer to one of the 48 pages of this thread

Photo from smart-elements

[Edited on 5-11-2014 by nhindori]

PBlack28196401.jpeg - 134kB
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[*] posted on 6-11-2014 at 15:48


There is already a thread about black P: http://www.sciencemadness.org/talk/viewthread.php?tid=12196
This doesn't belong to "preparation of elemental P" because it's a transformation of an allotrope from another one which already is elemental P.
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[*] posted on 11-2-2015 at 03:47
Monopotassium way?


Hello. I have read about the last twenty pages, but I couldn't found an answer. Is possible to obtain phosphorus from Monopotassium Phosphate KH2PO4 or from Trisodium Phosphate Na3PO4 using similar way to Ammonium Phosphate and coal method? I have only these two chemicals available.

[Edited on 11-2-2015 by Zarynga]
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[*] posted on 11-2-2015 at 13:43


Add hydrogen chloride during the reduction.



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[*] posted on 4-3-2015 at 10:57


If u heated red phosphorus in a sealed test tube to convert it to white phosphorus then opened the test tube under water the white phosphorus would sink to the bottom.if u repeated this lots of times wouldent you get a nice amount of white phosphorus???

I dont know if this works or not.its just an idea

Do u think it would work???
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[*] posted on 4-3-2015 at 11:22


Pyro did basically that except the test tube was bent but open, with the open end in the water. It seemed to work decently.
http://www.sciencemadness.org/talk/viewthread.php?tid=25653




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[*] posted on 7-5-2015 at 06:37


You supply phosphates but think they were made from phosphorous? Common man, nobody makes phosphates from elemental phosphorous.



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[*] posted on 7-5-2015 at 08:17


Quote: Originally posted by Molecular Manipulations  
You supply phosphates but think they were made from phosphorous? Common man, nobody makes phosphates from elemental phosphorous.


Certainly not for phosphate fertilizer. But IIRC elemental P is used by the carbonated beverage industry for making phosphoric acid. This is likely a way to obtain the purity they require.







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[*] posted on 7-5-2015 at 08:26


Quote: Originally posted by Magpie  
But IIRC elemental P is used by the carbonated beverage industry for making phosphoric acid. This is likely a way to obtain the purity they require.


I'm not sure it is made by the carbonated beverage industry but high purity (incl. food grade) H3PO4 is indeed manufactured from burning phosphorus.




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[*] posted on 6-6-2015 at 02:51


Maybe this has already been covered in the multiple pages of this thread (not all of which I have read). If so, I apologise.
I came across this video which results in what looks like a yield in the tens of grams range.
Source of phosphorus is a food additive or water softener.
http://www.melbournefooddepot.com/buy/sodium-hexametaphospha...
http://www.alibaba.com/showroom/sodium-hexametaphosphate.htm...

I am still not extremely clear on the process: in particular the reason for the NaCl and SiO2 in the reaction vessel. I think the receiving vessel has water in it, but again I am not sure. Anyway, the whole process looks reasonably accessible. I'd love some more insight if anyone has any. (Or refer me back to the sections of this thread that I have missed.)
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[*] posted on 6-6-2015 at 06:21


j_sum1, this is a know reaction
Quote: Originally posted by blogfast25  
2 NaPO3 + SiO2 + 10/3 Al ---> Na2SiO3 + 5/3 Al2O3 + 2 P

and also
Quote: Originally posted by Rogeryermaw  

6(NaPO3) + 10Al + 3SiO2 = 3Na2SiO3 + 5Al2O3 + 6P

Quote: Originally posted by Rogeryermaw  
i have done it!!!!!!!! i will post pics soon as i clean and solidify it all. they will be up tonight!!!

However, I have no idea why he needed NaCl.
Quote:
6NaPO3 + 10 Al + 3 SiO2 = 6P + 5Al2O3 + 3Na2SiO3
Reduction is performed by heating in a heat resistant tube 25 cm long and 1-1.5 cm in diameter, connected from one side to a source of clean hydrogen (gas cylinder or kipp's apparatus), and from the other side to a tube, which passes gaseous products into a crystallization vessel filled with water.
The heat resistant tube is filled with a mixture made from 1 weight part of NaPO3, 3 pars of SiO2 and 0.5 parts of aluminium turnings. With a help of asbestos corks the tube is connected from one side throught a washing bottle, filled with concentrated H2SO4, to a source of hydrogen, and from another to an outlet tube.
After removal of air from the apparatus using a strong flow of hydrogen and making sure that exiting hydrogen is pure, the heat resistant tube is heated using a burner with wide nozzle. Phosphorus being formed by the mentioned reaction is distilled and condensed into small balls within crystallization vessel with water. In dark you can notice a slight glowing of the phosphorus in the tube.
After the experiment is finished, the apparatus is dissasembled only after it has been completely cooled down in a flow of hydrogen.
Obtained phosphorus is put in a bottle filled with cold water.
Sodium metaphoshpate can be prepared by ammonium sodium phosphate hydrate calcination by reaction:
NaNH4HPO4*4H2O => NaPO4 + NH3 + 5H2O
Ripan, R. and Chetyanu, I. (1972) Inorganic Chemistry
PS: although I have no idea why these very conditions are needed. Also I can point at the book which says NaPO3 + NaCl leads to HCl, Cl2 and small amounts of POCl3 at 800°C; and Lerner mentiones P2O5 + NaCl => POCl3 at 300-420°C with perfect yield.

[Edited on 6-6-2015 by byko3y]
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[*] posted on 6-6-2015 at 08:30


Quote: Originally posted by j_sum1  

I am still not extremely clear on the process: in particular the reason for the NaCl and SiO2 in the reaction vessel. I think the receiving vessel has water in it, but again I am not sure. Anyway, the whole process looks reasonably accessible. I'd love some more insight if anyone has any. (Or refer me back to the sections of this thread that I have missed.)


This video is by rogeryermaw, who posted his stuff higher up in the thread.

The NaCl is present as a 'flux', promoting contact and mass transfer between the reagents. The SiO2 is a bit of a 'relic' from the old Ca phosphate + C + silica method.

I'm not sure why he doesn't just use a large open pile of BBQ coal and lots of air (leaf blower, for instance).




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[*] posted on 20-9-2015 at 20:49


Does anyone know the exact temperature range at which this reaction takes place

2NaH2PO4 --> Na2H2P2O7 + H2O

And also the following

3Na2H2P2O7 --> (NaPO3)6 + 3H2O

I would guess its up around 700°C but the wiki doesn't specify nor can i find anywhere that does tell me.
I also realize that it would be a hell of a lot easier to just buy sodium hexametaphosphate but for the sake of science it would be good to know the temp range required to undergo hydrolysis of monosodium phosphate to disodium pyrophosphate and so forth just in case sodium hexametaphosphate cannot be aquired.
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[*] posted on 16-1-2016 at 18:06


Quote: Originally posted by Assured Fish  
Does anyone know the exact temperature range at which this reaction takes place

2NaH2PO4 --> Na2H2P2O7 + H2O

And also the following

3Na2H2P2O7 --> (NaPO3)6 + 3H2O

I would guess its up around 700°C but the wiki doesn't specify nor can i find anywhere that does tell me.
I also realize that it would be a hell of a lot easier to just buy sodium hexametaphosphate but for the sake of science it would be good to know the temp range required to undergo hydrolysis of monosodium phosphate to disodium pyrophosphate and so forth just in case sodium hexametaphosphate cannot be aquired.


Ok so this thread is old and dead but ill post here.
169C
2NaH2PO4 -------> Na2H2P2O7

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[*] posted on 16-1-2016 at 18:15


Quote: Originally posted by Assured Fish  


Ok so this thread is old and dead but ill post here.
169C
2NaH2PO4 -------> Na2H2P2O7



Any evidence for your assertion?




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[*] posted on 17-1-2016 at 09:25


Quote: Originally posted by Assured Fish  
Quote: Originally posted by Assured Fish  
Does anyone know the exact temperature range at which this reaction takes place

2NaH2PO4 --> Na2H2P2O7 + H2O

And also the following

3Na2H2P2O7 --> (NaPO3)6 + 3H2O

I would guess its up around 700°C but the wiki doesn't specify nor can i find anywhere that does tell me.
I also realize that it would be a hell of a lot easier to just buy sodium hexametaphosphate but for the sake of science it would be good to know the temp range required to undergo hydrolysis of monosodium phosphate to disodium pyrophosphate and so forth just in case sodium hexametaphosphate cannot be aquired.


Ok so this thread is old and dead but ill post here.
169C
2NaH2PO4 -------> Na2H2P2O7



Why are you talking to yourself?

[Edited on 17-1-2016 by Bert]




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[*] posted on 8-2-2016 at 21:32


Hello all! I'm a new member and if it's ok with the forum I'd like to try a few different approaches to making white P4. I have a new camera coming in a few days for doing HD 1080P videos as my current one sucks. My plan is to tape the experiments then upload them to a proxied YT account. This way I can stay anonymous but also show people VIDEOS of this reaction going with many different tweaks to it.

There are mainly 4 different things I'll be doing here:

1) Using HHO (oxyhydro gas) + MAP coolant + AIR propane to test and run experiments at any temperature up to 2500C - 5000F. My HHO torch is 3 cells at 4-5 LPM (each cell) with 3, 12V-75A chargers. I finally fried a breaker a couple days ago so right now the torch is only running on 1 cell. What you see in the pic is a baby flame around 4-5LPM. Which on its own can boil & cut steel. But when everything is connected I get a surge of roughly 12-15LPM HHO on top of the MAP gas which is extraordinarily hot and cuts through 1/4" steel like butter. It really is powerful. When I change the tip to .035 the flame is at least 14+ inches. Which you'll see when I get my breaker fixed & get some advice from the electrician.

The main benefit of HHO is that the water (fuel) really does last forever. So there's no need to refill any gas tanks. The torches aren't really "cheap", but you can set up a powerful hobby torch for $150-$300 (or cheaper if you build the cells yourself). I should mention too, my goal is to use HHO just for testing. I want my final method to rely on simple air-MAP gas accessible by anyone.

2) Instead of using pure AL powder (500 mesh) I want to test a mixture of 50% AL, 20% MG, 30% C. I have a theory I'll talk about in #4.

3) When my camera gets here I'll be replacing all text & pics with video.

4) I'm going to start with a few "normal" reactions first. Then I'm going to set up a "rocket distiller". I believe one of the big problems with this reaction is the RELEASE of heat energy in the form of >>>pressure. I believe for every unit of energy that escapes in the form of pressure, that's 1 less unit the AL has to not only keep the sodium silicate and aluminum oxide molten and finishing their reactions.... but to CONTINUE & COMPLETE the process of reducing P4O10 to WP.

I believe this is a serious problem! Why? Because I've set this reaction of many times on a small scale by igniting it with either HHO or air-MAP. I notice the reaction will fire off (then I pull the heat away on purpose to see how far it goes on its own). Then when I add air-MAP the reaction starts up again. However, there is this weird threshold where the slag stops releasing WP with the air-MAP (at 1100C). I noticed when I add HHO at this point the reaction goes almost double the time. Like under it's own energy it goes for 3-5 seconds. MAP makes it go another 3-5 seconds as you see more WP liberate. But when you just keep the MAP there the reaction dies and the WP stops being liberated. When HHO is added the reaction goes off again vigorously for nearly double the length of time. Around 12-15 seconds.

My hypothesis is this:

AL - will burn up and get the reaction going as normal.
MG - will make the mix more reactive, will burn faster, hotter and create more pressure.
C - As the AL & MG are doing their thing, the C will be displaced as gas OUT of the vessel. This will conserve energy by lowering the weight of the slag and also add pressure that can be "recycled". Plus C produces cleaner WP.

I believe if this is done right, and I get the right %'s we may see some interesting things. For instance, if this goes off like a rocket there will be a very HOT & efficient afterburn. That should be capable of driving the reaction COMPLETELY to the right under it's OWN thermal energy.

My goal is to also make this reaction easier for people who don't have access to a lot of resources. For all we know, 1 tweak to the reducing powder or the way the reaction burns (making it burn like a rocket) may produce higher yields in much less time. This can also CONTROL the release of gas coming out of the distiller. And another issue is short distillers which is why I *may add a spiral distiller on my final model.

So far I've successfully ran this reaction many times but all on small scales under 5gms. Using a small retort with thin walls which I accidentally melted. I've also used tricalcium phosphate (mixed damp rid with TSP) + C + SiO2. Just to prove it works which it does but the available P4 is low, the reaction conserves no energy, my current retort can't handle the heat.... which is why I use NAPO4 now like everyone else.

Let me show some pics of things....


This is 1 cell of HHO (4+LPM) with a drip of MAP to color it blue.
bPe69Gr.jpg - 30kB

This is a thick steel reducer that I cut in half. Then I realized the camera was just a big white screen so I had to let it cool (you can see the back where it snapped off)
rx9msFl.jpg - 24kB

This is my HHO torch which is semi-dismantled at the moment.
yJxn9Ck.jpg - 55kB

THIS is what I need feedback on. I built 2 retorts. 1 big that's not done yet and 1 small. This is my smaller one that I want to begin doing larger chargers in (25+gms).
yopDzh2.jpg - 39kB

It's crude but I'm gonna hit the back cap with MAP gas and the middle with a cooled burst of HHO. I did NOT weld the copper distiller to the steel because the threads on that adapter connect to my bigger retort (it can be reversed for larger hundred gm charges).

What I did to connect the copper pipe is put it in the reducer with a small gap around the pipe (like 2mm). Then I used a small flat screwdriver and quite a bit of AL foil to pack it in tight all around the pipe down to the bottom. After that I poured SiO2 dust all around the pipe. Then I hammered the dust down hard ass possible going in circles packing it down. Then I put another layer of foil up top and hammered that down to sandwich the SiO2 dust between 2 layers of very tightly packed foil. So basically it's like a rock of SiO2 powder crammed between the pipes that effectively seals out air. This way down the line when I'm ready to scale I just hammer/wrench out the pipe and connect it to my bigger retort then use the small retort as the distilling side.

The thing is... I'm a bit worried as to whether a "seal" like this will hold up.

I've seen the amount of smoke just a few gms produces. The first time I tried AL I did it open air in my home with no ventilation... my whole house filled up with smoke. I immediately opened all the windows and threw fans in. Then I started testing the same volume in my bathroom in a small retort. With a respirator on my face and small fan vent on the ceiling.

My "ventilation" now is a fan in the window (bathroom fan isn't powerful enough for large charges). I can't do this outside. It's too cold. Nosey neighbords, etc. So it has to be done inside. I've already heated the pipe with MAP and HHO to see how it holds up and as long as I keep enough coolant in the line the pipe stays bright orange-yellow and doesn't melt. You can also bang on it and it doesn't deform unless you turn down the MAP gas. My concern though is at higher weight the reaction itself could melt the AL. Then I'm left with just SiO2 and I'm hoping worse-case-scenario that will stop any breach of O2.

Finally, I've thought about flooding the retort with CO2 gas. As I saw someone else in this thread do that and that will allow me to test the retort with smaller amounts first. The problem is he did that around 750C in a testube. I'll be slightly under the melting point of steel (1300C?). From what I understand, CO2 gas is no longer "inert" at these temperatures. As in, the AL with burn in CO2 like oxygen inside the retort? They say not to put out MG fires with CO2 so this has to apply to AL as well, right?

Sheesh, so many things that could go wrong I think I'll just start small maybe 15gms and see how that holds up.

My end goal is to build a "quick fire rocket distiller" so safety & engineering are huge concerns here. When I switch to the rocket model I'll test very small amounts first on video. I know many on here will be concerned with clogging. But I think good engineering will stop that.

If people have thoughts or comments feel free to LMK. :)

Thank you!

ps. I realize this thread is extremely old. But this is the ONLY THREAD on the internet that sufficiently covers this topic. And the 1 thing this thread really lacks is videos. So even if my hypotheses are wrong at least others will get to see this done on video in detail. With me tweaking as many variables as possible till I'm hitting 80% yields both consistently & efficiently as possible... in a way that is accessible to most people (my end goal is to make this work with only air-MAP and no HHO). Wish me luck. :-)

pss. I will continue with pics only until my cam arrives.





[Edited on 9-2-2016 by BluePlanet1]
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