Abstract
A CONSIDERABLY improved method of isolating hydroxylamine is described by Prof. Brühl, of Heidelberg, in the current Berichte, by which a tolerably large quantity of the pure substance may be prepared without danger in a short space of time, and which may therefore be of general interest on account of its suitability for lecture and demonstration purposes. It may be remembered that M. Lobry de Bruyn, who first isolated solid hydroxylamine two years ago (vide NATURE, vol. xlv. p. 20), prepared it from a mixed solution of the hydrochloride and of sodium methylate in methyl alcohol. This solution, after removal of the precipitated common salt, was first concentrated over a water bath, under the diminished pressure of 100 m.m., and afterwards subjected to fractional distillation over a flame at the still lower pressure of 40 m.m. A continuous fractionating vacuum-apparatus was considered unsuitable, and the change of receivers could only be conveniently effected by temporarily arresting the distillation. This mode of operating frequently led to violent explosive decomposition of the heated hydroxylamine, and, moreover, the yield rarely exceeded 17 per cent, of the theoretical. Prof. Brühl, desiring to obtain a considerable quantity of the pure base for spectrometric purposes, has been led to devise the following much more convenient method:—
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TUTTON, A. The Preparation and Properties of Free Hydroxylamine. Nature 49, 105–106 (1893). https://doi.org/10.1038/049105a0
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DOI: https://doi.org/10.1038/049105a0