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] |