TigerWoods
Harmless
Posts: 3
Registered: 24-2-2013
Member Is Offline
Mood: No Mood
|
|
Synthesis of Carbamide Peroxide?
I am looking to synthesize Carbamide/Urea Peroxide 35%, basically it's pretty simple from what I read on here and a couple of other places such as
wikipedia. All you would need is Urea and Peroxide, and thus it would result in Carbamide Peroxide. I am not a chemist by any means, nor do I know as
much as some of you may, maybe some of you could give me a few pointers.
|
|
|
Nicodem
|
Thread Moved
24-2-2013 at 03:18 |
Adas
National Hazard
Posts: 711
Registered: 21-9-2011
Location: Slovakia
Member Is Offline
Mood: Sensitive to shock and friction
|
|
Mix urea and hydrogen peroxide, evaporate excess water under vacuum.
Rest In Pieces!
|
|
|
Mercedesbenzene
Hazard to Self
Posts: 64
Registered: 4-9-2011
Location: BC
Member Is Offline
Mood: Sub Zero
|
|
Its a fairly straight forward procedure. You add 30% hydrogen peroxide and urea in a 2:3 molecular ratio, heat to 60C until the urea dissolves and let
cool slowly. The crystals can be collected by vacuum filtration. The MP of around 85C can be used to determine if you actually got the adduct or if
you have urea. I have done this procedure following this paper.
Lu, Hughes, and Giguere (J. Amer. Chem. Soc. 63(1):1507-1513 (1941))
|
|
|
Organikum
resurrected
Posts: 2339
Registered: 12-10-2002
Location: Europe
Member Is Offline
Mood: frustrated
|
|
Quote: Originally posted by Mercedesbenzene  | Its a fairly straight forward procedure. You add 30% hydrogen peroxide and urea in a 2:3 molecular ratio, heat to 60C until the urea dissolves and let
cool slowly. The crystals can be collected by vacuum filtration. The MP of around 85C can be used to determine if you actually got the adduct or if
you have urea. I have done this procedure following this paper.
Lu, Hughes, and Giguere (J. Amer. Chem. Soc. 63(1):1507-1513 (1941)) |
So you have the paper in electronic form I would appreciate when you make it here available, yes?
And does it work with 12% H2O2? In my country authorities restricted OTC sales to this max. H2O2 content (and will outlaw it basically completely next
year).
Say Vacuum and CaCl2 in a suitable container, vacuum replentished from time to time? Wouldn't matter if it takes a week when it has not to be tended
permanently.
regards
/ORG
|
|
|
no_dream
Harmless
Posts: 14
Registered: 15-8-2011
Member Is Offline
Mood: No Mood
|
|
The Crystal Structure of the Urea—Hydrogen Peroxide Addition Compound CO(NH2)2·H2O2
Chia-Si Lu , E. W. Hughes , Paul A. Giguère
J. Am. Chem. Soc., 1941, 63 (6), pp 1507–1513
DOI: 10.1021/ja01851a007
Attachment: ja01851a007.pdf (200kB)
This file has been downloaded 2312 times
|
|
|
TigerWoods
Harmless
Posts: 3
Registered: 24-2-2013
Member Is Offline
Mood: No Mood
|
|
Okay, so (sorry if I sound a little noobish, chemistry is very interesting to me, it's just I haven't had the opportunities to learn it aswell as some
of you may had). There are a couple of things I guess I have picked up while looking for some answers, Urea Peroxide basically keeps the Hydrogen
Peroxide from decomposing? Maybe thats not the correct word? From what I read, the Urea Peroxide when added to water would then basically just release
the Hydrogen Peroxide, and keep it from losing its potency. Now this all makes good sense, next question is, and sorry if I am seeming redundant and
that you already answered this
"You add 30% hydrogen peroxide and urea "
If I wanted to make Carbamide Peroxide 44%, and make it in a gel base, how could I go about doing this?
I understand that some of you may be thinking "this is quite trivial", and I am please forgive me if it seems like I don't know what I am doing, but
let me assure you, I have done some research myself before asking.
|
|
|
Organikum
resurrected
Posts: 2339
Registered: 12-10-2002
Location: Europe
Member Is Offline
Mood: frustrated
|
|
| Quote: Originally posted by TigerWoods | Okay, so (sorry if I sound a little noobish, chemistry is very interesting to me, it's just I haven't had the opportunities to learn it aswell as some
of you may had). There are a couple of things I guess I have picked up while looking for some answers, Urea Peroxide basically keeps the Hydrogen
Peroxide from decomposing? Maybe thats not the correct word? From what I read, the Urea Peroxide when added to water would then basically just release
the Hydrogen Peroxide, and keep it from losing its potency. Now this all makes good sense, next question is, and sorry if I am seeming redundant and
that you already answered this
"You add 30% hydrogen peroxide and urea "
If I wanted to make Carbamide Peroxide 44%, and make it in a gel base, how could I go about doing this?
I understand that some of you may be thinking "this is quite trivial", and I am please forgive me if it seems like I don't know what I am doing, but
let me assure you, I have done some research myself before asking.
|
One would use the search function of the board and the internet.
You add gelantine to a wet mush of urea peroxide. Thats in the article posted before. Did not read it he?
With acid and formaldehyde you get a thermosetting plastic
/ORG
PS: To answer my own question, after the information of the thread linked above it seems lower concentrations of H2O2 should work, as dissolving urea
in water and then adding a concentrated solution of H2O2 is as I suppose replaceable by using H2O2 of lower concentration from start. Maybe with
losses. Aber Irgendwas ist ja immer.
|
|
|
TigerWoods
Harmless
Posts: 3
Registered: 24-2-2013
Member Is Offline
Mood: No Mood
|
|
Go ahead, search the internet, then come back and tell me how easy it was to find some information about this.
| Quote: Originally posted by Organikum | | Quote: Originally posted by TigerWoods | Okay, so (sorry if I sound a little noobish, chemistry is very interesting to me, it's just I haven't had the opportunities to learn it aswell as some
of you may had). There are a couple of things I guess I have picked up while looking for some answers, Urea Peroxide basically keeps the Hydrogen
Peroxide from decomposing? Maybe thats not the correct word? From what I read, the Urea Peroxide when added to water would then basically just release
the Hydrogen Peroxide, and keep it from losing its potency. Now this all makes good sense, next question is, and sorry if I am seeming redundant and
that you already answered this
"You add 30% hydrogen peroxide and urea "
If I wanted to make Carbamide Peroxide 44%, and make it in a gel base, how could I go about doing this?
I understand that some of you may be thinking "this is quite trivial", and I am please forgive me if it seems like I don't know what I am doing, but
let me assure you, I have done some research myself before asking.
|
One would use the search function of the board and the internet.
You add gelantine to a wet mush of urea peroxide. Thats in the article posted before. Did not read it he?
With acid and formaldehyde you get a thermosetting plastic
/ORG
PS: To answer my own question, after the information of the thread linked above it seems lower concentrations of H2O2 should work, as dissolving urea
in water and then adding a concentrated solution of H2O2 is as I suppose replaceable by using H2O2 of lower concentration from start. Maybe with
losses. Aber Irgendwas ist ja immer. |
|
|
|
franklyn
International Hazard
Posts: 3026
Registered: 30-5-2006
Location: Da Big Apple
Member Is Offline
Mood: No Mood
|
|
Most things have been here for longer than some would care to look.
The Crystal Structure of the Urea - Hydrogen Peroxide Addition Compound CO(NH2)2•H2O2
http://www.sciencemadness.org/talk/viewthread.php?tid=3214&a...
7 7 3 , downloads and counting.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
