MineMan
International Hazard
Posts: 1012
Registered: 29-3-2015
Member Is Offline
Mood: No Mood
|
|
Making ammonium hypophosphite
I want to expire by using this compound in pyrotechnics. I have the sodium salt. Any ideas how to make the ammonium? The only patent I found makes a
solution.
|
|
|
draculic acid69
International Hazard
Posts: 1371
Registered: 2-8-2018
Member Is Offline
|
|
Add HCL to free the acid filter out the salt then neutralize with ammonia then evaporate to dryness
Also was expire meant to mean explore or r U contemplating suicide by
ammonium hypophosphite explosion?
|
|
|
Belowzero
Hazard to Others
Posts: 173
Registered: 6-5-2020
Location: Member Is Offline
Member Is Offline
|
|
| Quote: |
Also was expire meant to mean explore or r U contemplating suicide by
ammonium hypophosphite explosion?
|
Yes I am worried too!
Otherwise that is a very funny typo 
|
|
|
unionised
International Hazard
Posts: 5128
Registered: 1-11-2003
Location: UK
Member Is Offline
Mood: No Mood
|
|
Just make sure it doesn't disproportionate to phosphine, or you might be doing more expiring than you planned.
|
|
|
woelen
Super Administrator
Posts: 8027
Registered: 20-8-2005
Location: Netherlands
Member Is Offline
Mood: interested
|
|
How effective is this at removing the sodium from the solution?
Also, can ammonium hypophosphite easily be dried? Isn't that compound extremely hygroscopic?
Probably you also need excess concentrated HCl to get decent separation of NaCl from the solution and evaporating that also can be quite cumbersome
(nasty fumes, evaporation will be slow).
I know of a similar method for making perchloric acid from conc. HCl and concentrated solution of NaClO4. In that case, however, you can boil off any
excess HCl (boiling to 140 C or so) and concentrate the solution to 60% without leaving a noticeable amount of HCl. With hypophosphite I do not think
this is safe. You most likely decompose the acid, giving lots of phosphine and a big chance of unintended ignition.
[Edited on 4-6-21 by woelen]
|
|
|
draculic acid69
International Hazard
Posts: 1371
Registered: 2-8-2018
Member Is Offline
|
|
Quote: Originally posted by woelen  |
How effective is this at removing the sodium from the solution?
Also, can ammonium hypophosphite easily be dried? Isn't that compound extremely hygroscopic?
Probably you also need excess concentrated HCl to get decent separation of NaCl from the solution and evaporating that also can be quite cumbersome
(nasty fumes, evaporation will be slow).
I know of a similar method for making perchloric acid from conc. HCl and concentrated solution of NaClO4. In that case, however, you can boil off any
excess HCl (boiling to 140 C or so) and concentrate the solution to 60% without leaving a noticeable amount of HCl. With hypophosphite I do not think
this is safe. You most likely decompose the acid, giving lots of phosphine and a big chance of unintended ignition.
[Edited on 4-6-21 by woelen] |
As for effectiveness of removing the salt I'm not 100%sure how much precipitates
and how much stays dissolved. I think if one uses acetone as a solvent for the acidification most salt should precipitate. Also I think
hypophosphorus acid dissolves in ether if one wishes to force more salt out. As for the ammonium salt I'm not sure if it's dry-able or not.
|
|
|
MineMan
International Hazard
Posts: 1012
Registered: 29-3-2015
Member Is Offline
Mood: No Mood
|
|
| Quote: Originally posted by draculic acid69 | Add HCL to free the acid filter out the salt then neutralize with ammonia then evaporate to dryness
Also was expire meant to mean explore or r U contemplating suicide by
ammonium hypophosphite explosion? |
Explore
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
