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2018, N3, pp. 56-66

D.S. Kosyakov, N.V. Ulyanovskii, A.D. Ivakhnov, I.I. Pikovskoi

Transformation of Unsymmetrical Dimethylhydrazine in Supercritical Water

The behavior of a highly toxic rocket fuel 1,1-dimethylhydrazine in a medium of supercritical water in the temperature range 400650 °C has been studied by highresolution mass spectrometry with electrospray ionization. It was found that thermal transformation leads to the formation of a wide range of products, numbering at least 350400 nitrogen-containing compounds of CHN and CHNO-classes. The main products are nitrogen-containing heterocyclic compounds containing from one to three nitrogen atoms. On the basis of the accurate masses, the supposed identification of the most important components was given. It was shown that at the temperature of 650 °C 1-methyl-1H-1,2,4-triazole predominates among the transformation products, the amount of which in the reaction mixture is 1.2% of the weight of the initial UDNH.

Key words: supercritical water, unsymmetrical dimethylhydrazine, UDMH, pyrolysis,rocket fuel, transformation, high-resolution mass spectrometry

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