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Liquid phase hydrogenation of acethydrazone to N'-methyl acethydrazide over Pd/γ-Al2O3 catalyst

Brazilian Journal of Chemical Engineering, 01 March 2010, Vol.27(1), pp.145-152 [Peer Reviewed Journal]

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  • Title:
    Liquid phase hydrogenation of acethydrazone to N'-methyl acethydrazide over Pd/γ-Al2O3 catalyst
  • Author: Pakdehi, S. G ; Sohrabi, M ; Moghaddam, A. S
  • Found In: Brazilian Journal of Chemical Engineering, 01 March 2010, Vol.27(1), pp.145-152 [Peer Reviewed Journal]
  • Subjects: Engineering, Chemical ; Monomethyl Hydrazine ; Hydrogenation ; Pd/Γ-Al2o3 Catalyst ; Kinetics
  • Language: Portuguese
  • Description: 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-Al2O3 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.
  • Identifier: ISSN: 1678-4383 ; DOI: 10.1590/S0104-66322010000100013

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