Chemical Reaction Mechanism of Cetane Number Improving Agents.

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  • HASHIMOTO Kohtaro
    Dept. of Chemical System Engineering, School of Engineering, The University of Tokyo JOMO Technical Research Center
  • AKUTSU Yoshiaki
    Dept. of Chemical System Engineering, School of Engineering, The University of Tokyo
  • ARAI Mitsuru
    Dept. of Chemical System Engineering, School of Engineering, The University of Tokyo
  • TAMURA Masamitsu
    Dept. of Chemical System Engineering, School of Engineering, The University of Tokyo

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  • セタン価向上剤の化学反応メカニズム
  • Chemical Reaction Mechanism of Cetane N

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Abstract

To clarify the reaction mechanism in order for elucidating the effects of cetane number improving agents, we have attempted to calculate the pressure-temperature profile for the spontaneous ignition of n-butane in the presence of cetane number improving agents. First, ignition delay periods were calculated under the conditions similar to those used into the experiment using a rapid compression machine to confirm the validity of the model. Next, the effects of known cetane number improving agents such as alkyl nitrates, alkyl nitrites, and organic peroxides on ignition delay periods were examined under adiabatic conditions at constant volume. As a result, all cetane number improving agents reduced the ignition delay period of n-butane. On the other hand, nitromethane, wich has no cetane number improving effect, did not show any effect on the ignition delay period. Alkyl radicals produced from thermal decomposition of cetane number improving agents may play an important role in the reduction of the ignition delay period. The main reactions of the alkyl radicals involved in the reduction of the ignition delay period of n-butane were determined using the simple sensitivity analysis.

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