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Author: Subject: Hydrogen Peroxide purification
APO
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[*] posted on 29-12-2012 at 13:40
Hydrogen Peroxide purification


Well, you can purify it buy fractional crystallation(freezing the water away) which will give 62% concentration, fractional distallation is highly dangerous with H2O2 so that's out of question. But is there a way of seperating the H2O2 into two layers?

[Edited on 29-12-2012 by APO]

[Edited on 30-12-2012 by APO]
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neptunium
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[*] posted on 29-12-2012 at 15:05


in short no. they are both missible in one another in all proportion



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APO
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[*] posted on 29-12-2012 at 17:24


What are the most efficient methods of purification?
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Ephesian
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[*] posted on 29-12-2012 at 17:35


I have 500 mL of 30% H2O2 fisher scientific if you need some, ill put it up on ebay for you at a reasonable price.
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plante1999
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[*] posted on 29-12-2012 at 18:09


I think the best way is passing air trough 3% hydrogen peroxide at a temperature of 60-70 degree Celsius. Water evaporate before the hydrogen peroxide, effectively concentrating the peroxide. I already concentrated it too much at 50%, so I think it could go all the way to 90%. Do not concentrate it more than 30% for safety!

http://hclo3chem.weebly.com/concentrate-hydrogen-peroxide.ht...




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elementcollector1
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[*] posted on 29-12-2012 at 19:14


I agree with plante, but freezing only gives somewhere around 15-30% before it stops working.



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APO
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[*] posted on 29-12-2012 at 19:24


Thanks plante1999! Sounds like a pretty good method, I'll have to try it sometime.
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shannon dove
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[*] posted on 30-12-2012 at 10:06


Wow, plante, I didn't know concentrating hydrogen peroxide was that simple.
How much is lost along with the water? (How efficient is it?)
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plante1999
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[*] posted on 30-12-2012 at 10:20


The efficiency is very high, I had made a test with 1 L of 3% H2O2 and got 100ml of about 88.5-90 volume hydrogen peroxide, or about 29-30% more than 95% yield is obtained if one troughly clean the labware and equipment.



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kristofvagyok
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[*] posted on 30-12-2012 at 10:29


Quote: Originally posted by plante1999  
The efficiency is very high, I had made a test with 1 L of 3% H2O2 and got 100ml of about 88.5-90 volume hydrogen peroxide, or about 29-30% more than 95% yield is obtained if one troughly clean the labware and equipment.

Khm, 1l of 3% solution contains 30g of pure H2O2, so if you've got 100cm3 at the end and we're saying that you had a 100% yield than your end product is circa 26% pure.




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plante1999
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[*] posted on 30-12-2012 at 10:36


If one ml of 3% produce 10 volume of O2 when decomposed, and 6% is 20 volumes, Wouldn't 90 volume be 30%?

I'm sure one ml of the peroxide produced 90 ml of gas. As for the volume of the starting peroxide and finishing volume my glassware are +-10% (Beaker) since I don't have a large enough measuring cylinder.




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shannon dove
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[*] posted on 30-12-2012 at 10:47


Why was fractional distillation and freezing methods developed if it is that easy to concentrate? Am I missing something here? It's not April fools day.
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plante1999
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[*] posted on 30-12-2012 at 10:51


I don't know why air evaporation method is not used, I decided to use it because the low temperature protect peroxide from decomposing, the process is also easy. But a fish air pump is probably obligatory as fish pump troughly filtrate the air (at least mine do).




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kristofvagyok
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[*] posted on 30-12-2012 at 10:59


Quote: Originally posted by plante1999  
If one ml of 3% produce 10 volume of O2 when decomposed, and 6% is 20 volumes, Wouldn't 90 volume be 30%?
Gas volumetric titrations are not the best, they have a high percent failure rate. Titrate it with KMnO4.

You've said that you can go up with this method to 50-90% H2O2 content, you also wrote that you have started from 3% H2O2 and got 100cm3 of +90% H2O2 what is everything but not true.
So what did you get from what? If you have ended up with 30% H2O2, than it's aint special, anyone can buy it and also everyone can make it.




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shannon dove
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[*] posted on 30-12-2012 at 10:59


I have a dream that one day I will go to the nitric acid thread and there will be a just as easy method of of concentrateing nitric acid, then I will go to the elemental phosphorus thread .......
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plante1999
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[*] posted on 30-12-2012 at 11:05


Quote: Originally posted by kristofvagyok  
Quote: Originally posted by plante1999  
If one ml of 3% produce 10 volume of O2 when decomposed, and 6% is 20 volumes, Wouldn't 90 volume be 30%?
Gas volumetric titrations are not the best, they have a high percent failure rate. Titrate it with KMnO4.

You've said that you can go up with this method to 50-90% H2O2 content, you also wrote that you have started from 3% H2O2 and got 100cm3 of +90% H2O2 what is everything but not true.
So what did you get from what? If you have ended up with 30% H2O2, than it's aint special, anyone can buy it and also everyone can make it.


I will try to do something for titration, as permanganate is regulated here, and as you may know, not everybody here have the mean and the resource of a commercial lab as you do.

I NEVER SAID that I got 90% peroxide. I said that I already concentrated too much accidentally to 50% and as such I do think that 90% concentration is possible. I would greatly want a quote for this affirmation.
I never said that I made 90%, if I did it was by a typo or a misunderstanding..

@shannon dove
If you don't believe in my procedure then you are not obligated to try it. It is not the first time I publish procedure never one saw/used. You can look in the mercury from cinnabar, as I told a process for neptunium.

Not everyone is obligated to trust a 16 year old guy tough.

[Edited on 30-12-2012 by plante1999]




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shannon dove
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[*] posted on 30-12-2012 at 11:13


I do believe you plante, and I very much appreciate your research.
I would buy you a beer if I could.
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[*] posted on 30-12-2012 at 13:04


Would the evaporation method work better in a descicant chamber?
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platedish29
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[*] posted on 31-12-2012 at 08:48


Quote: Originally posted by APO  
Would the evaporation method work better in a descicant chamber?

Guess it works significantly for V > 30% by putting anhydrous silica in it thus easily reaching 70% concentration considering how big silica gel grows
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[*] posted on 31-12-2012 at 09:39


How about merging both air evaporation and chemical dessication?
H2O2 + 7 H2O + CaCl2 -> H2O2 + CaCl2.7H2O dessicates
wherein H2O stands for removable water
H2O2 + 3CaCl2 + 2K3PO4 --> H2O2 + 3/2Ca2PO43(ppt) + 6KCl(some ppt)
wherein additional salts were dissolved in the own peroxide but in a different vessel
H2O2 + 2KCl + Fe(ClO3)3--> H2O2 + KClO3(ppt) + FeCl3
H2O2 + FeCl3 + 3NH3 --> H2O2 + Fe(OH)3 + 3NH4Cl Extra dessication occurs by the formation of hydroxides and ammonium ion
H2O2 + 2NH4Cl + PbCO3 --> H2O2 + PbCl2 + CO2 + 2NH3 + H2O
virtually removing ions from the solution

Might that go for 90%?
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[*] posted on 31-12-2012 at 10:04


It is almost inevitable that your dessicants will contain traces of metal ions like copper that will be concentrated in your peroxide.
This is extremely dangerous as highly concentrated hydrogen peroxide is explosively unstable in the presence of dust, some metal ions, finely divided metals, etc.
Even 35% hdrogen peroxide will cause rapid and painful burns if the cold solution touches the skin.
I use it on a routine scale in litre quantities for cleaning and sterilising brewing equipment and I treat it with respect.
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[*] posted on 31-12-2012 at 14:06


On account for the need for a centrifuge this route could also be used to prepare the loudest bang after pulling the whole machine into tears!!
Honestly, I don't think there will be any contaminants after the process is done am I wrong?
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[*] posted on 31-12-2012 at 22:33


This is slightly off-topic, but does anyone know what the concentration of hydrogen peroxide is in glow sticks? If it's anywhere higher than 12 or so, this could be a useful and viable source (esp. from camping stores, Halloween season, etc.).



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[*] posted on 31-12-2012 at 23:01


Happy new year!!!
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[*] posted on 1-1-2013 at 05:14


Quote: Originally posted by Poppy  
On account for the need for a centrifuge this route could also be used to prepare the loudest bang after pulling the whole machine into tears!!
Honestly, I don't think there will be any contaminants after the process is done am I wrong?


You do not want any contaminants at all in hdrogen peroxide as it becomes very concentrated.
Hydrogen peroxide of over 70% concentration should be treated as a strongly corrosive, oxidisng agent and sensitive explosive.
Above this concentration contact with a suitable catalyst will cause instantaneous decomposition into oxygen and steam.
http://en.wikipedia.org/wiki/High-test_peroxide
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