It is evident that in foreign parts,
or in any place where there is a difficulty in disposing of the
ammonia, the obtaining of the same in a dry form offers several
advantages as compared with having it as a weak solution.
* * * * *
RECONVERSION OF NITRO-GLYCERIN INTO GLYCERIN.
By C.L. BLOXAM.
The following experiments on this subject appear to possess some
interest at the present moment:
1. Nitro-glycerin was shaken with methylated alcohol, which dissolves
it readily, and the solution was mixed with an alcoholic solution of
KHS (prepared by dissolving KHO in methylated spirit, and saturating
with H_{2}S gas). Considerable rise of temperature took place, the
liquid became red, a large quantity of sulphur separated, and the
nitro-glycerin was entirely decomposed.
2. Nitro-glycerin was shaken with a strong aqueous solution of
commercial K_{2}S. The same changes were observed as in 1, but the
rise of temperature was not so great, and the liquid became opaque
very suddenly when the decomposition of the nitro-glycerin was
completed.
3. The ordinary yellow solution of ammonium sulphide used in the
laboratory had the same effect as the K_{2}S. In this case the mixture
was evaporated to dryness on the steam bath, when bubbles of gas were
evolved, due to the decomposition of the ammonium nitrite. The pasty
mass of sulphur was treated with alcohol, which extracted the
glycerin, subsequently recovered by evaporation.
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