Catalytic hydrogenation of acethydrazide (AH) is the main step in the production of N´-methyl acethydrazide (MAH). In this step, AH reacts with formaldehyde to produce acetylhydrazone (AOH). AOH is hydrogenated in the presence of 5% Pd/γ-Al 2 O 3 catalyst to MAH. In this paper, the effects of hydrogen pressure, catalyst loading and initial concentration of AOH on the initial rate of hydrogenation were studied in a batch slurry reactor within a temperature range of 303-333K. The hydrogenation rate was first order with respect to hydrogen concentration at lower hydrogen pressures. However, at higher pressures, the rate became independent of both hydrogen and initial AOH concentrations. A single site Langmuir-Hinshelwood type formulation was found to describe adequately the kinetic data. A good correlation was observed between the predicted concentration vs. time profiles and those determined experimentally. The apparent activation energy was calculated from the initial rates as 40.6 kJ/mol.
Catalytic reductive methylation of acetylhydrazine (AH) to dimethyl acetylhydrazine (DMAH) is a key step in the production of unsymmetrical dimethyl hydrazine (UDMH). The results of the present study show that the limiting step in this process is the hydrogenation of AH to mono methyl acetylhydrazine (MMAH). The kinetics of the hydrogenation of acetylhydrazone (AOH) using an activated carbon catalyst impregnated with 5 % palladium were studied in a stirred slurry reactor at 40±65 C and 5±25 bar hydrogen pressure. Analysis of the data from this investigation indicates that the rate of hydrogenation is consistent with an Eley-Rideal reaction mechanism. The activation energy for the hydrogenation was determined as 44 kJ/mol.
Gel propulsion systems are of increasing interest due to their valuable energetic and safety considerations. In this paper, performance parameters of gelled UDMH/IRFNA bi‐propellant were compared with performance parameters of its liquid bi‐propellant. Fire tests were carried out with combustion chamber pressures of about 1 to 3 MPa and L* values of 89, 127 and 162 cm. The results showed that the suitable L* to obtain best performance for liquid UDMH/IRFNA combination at the mentioned conditions was 127 cm and for gelled UDMH/IRFNA bi‐propellant was 162 cm, although the increase in performance with an increase of L* from 127 to 162 cm for the gel was very low.
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