Firstly EvlRenne; from where did this procedure come? Phenol nitrates easily to the mononitro compounds (o and p) plus a lot of tar so I can't see
further nitration yielding close to theoretical yield at all let alone in the absence of sulphuric acid. So how do you know that your product is Dnp?
Secondly, dry 2,4-dinitrophenol is much less sensitive than its salts and is less sensitive than picric acid which is not particularly sensitive
anyway. The salts, particularly of the heavy metals are more sensitive and explosive than the free dinitrophenol. The ammonium salt of picric acid is
pretty insensitive so maybe the dnphenate is too but dnp is a less strong acid than picric acid and the ammonium salt may not be so stable, it may
slowly loose ammonia. There are several compendious works on nitrophenols with regards to explosive properties have you checked out the forum library?
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