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  • thermal modes of a plug flow reactor with a liquid liquid Heterogeneous System
    Russian Journal of Physical Chemistry B, 2017
    Co-Authors: N. G. Samoilenko, E. N. Shatunova, V A Bostandzhiyan, B. L. Korsunskii
    Abstract:

    The thermal modes of a flow plug reactor with an exothermic chemical reaction are numerically simulated. A Heterogeneous reaction System consisting of two immiscible liquids is studied: one of the liquids (dispersed phase) in the form of droplets is distributed in the other (dispersion phase). The characteristics of the thermal modes of the reactor at various values of two governing parameters, the Damkohler number and the rate of extraction of the dissolved substance from the dispersed phase into the dispersion phase is examined. Two modes of chemical reaction in the reactor are demonstrated to be possible: low-temperature and high-temperature. Critical criteria of thermal ignition are formulated. The dependence of the structure of the thermal wave on the governing parameters is investigated.

  • thermal explosion of a liquid solid Heterogeneous System in a semibatch reactor
    Russian Journal of Physical Chemistry B, 2017
    Co-Authors: N. G. Samoilenko, V A Bostandzhiyan, B. L. Korsunskii, L. V. Kustova, Aleksandrovich Vitalij Ilichev
    Abstract:

    The results of investigation of the characteristics of thermal explosion in a semibatch reactor filled with a liquid−solid Heterogeneous exothermic System are presented. Two successive macroscopic stages in this reacting System are considered. The focus was on studying the effects of the rate of supply of solid reagent and the rate of its dissolution on the critical condition of thermal explosion. It is shown that a thermal explosion can occur in both the first (during solid reagent supply into the reactor) and second macroscopic stages (after supply cessation).

  • thermal explosion in a batch reactor charged with a liquid solid Heterogeneous System
    Russian Journal of Physical Chemistry B, 2016
    Co-Authors: N. G. Samoilenko, Aleksandrovich Vitalij Ilichev, V A Bostandzhiyan, B. L. Korsunskii, L. V. Kustova
    Abstract:

    The characteristics of a thermal explosion in an ideal mixing batch reactor charged with a liquid–solid Heterogeneous System are studied. The reactor initially contains both phases. The solid reagent dissolves and reacts in the liquid phase. A strong dependence of the critical value of the Semenov parameter on the dimensionless time of complete dissolution of the solid reagent is established. It is shown that, at short times of complete dissolution, the critical value of the Semenov parameter is practically independent on this time, and the thermal explosion occurs as in a homogeneous System, according to Semenov theory. The Heterogeneous properties of the reaction System manifest themselves only at long times of complete dissolution.