Abstract
The oxidation of methylhydrazine (monomethylhydrazine MMH) is studied in a strictly single-phase gaseous medium, in a reconstituted surrounding atmosphere. In order to work under such conditions, a specific apparatus was assembled to monitor the evolution of the reactants through time. The reaction kinetics was studied at 50°C to avoid condensation of the water formed and for O2/MMH mole ratios between 1 and 4. Under these conditions, the partial pressures of O2 were between 0.05 and 0.18 bar (4% MMH per volume). The main reaction products were monitored through time and identified by gas chromatography coupled with mass spectrometry (GC/MS). The products were: N2, CH4, CH3-NH-N=CH2 (formaldehyde monomethylhydrazone), NH3, H2O, CH3OH, and CH2=N-N=N-CH3 (2,3,4-triazapenta-1,3-diene). The formation of nitrosamines was not observed under these experimental conditions. The rate laws related to the disappearance of the reagents were clearly established and can be described by 2 consecutive parallel reactions of order 2 whose rate constants are: k 1 = 7.57 × 10−2 bar−1 min−1 and k 2 = 0.5 bar−1 min−1. Analysis of the products permitted establishing an approximated balance of the global reaction.
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Published in Russian in Kinetika i Kataliz, 2009, Vol. 50, No. 5, pp. 745–754.
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Molinet, J., Pasquet, V., Bougrine, A.J. et al. Oxidation kinetics of methylhydrazine in a strictly single-phase medium studied in reconstituted air. Kinet Catal 50, 715–724 (2009). https://doi.org/10.1134/S0023158409050139
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DOI: https://doi.org/10.1134/S0023158409050139