The study is focused on the applied task of determination of self-ignition (flash) temperature of unstable substances in order to facilitate occupational safety without conducting large-scale experiments. For two representatives of a number of naphthoquinonediazides, semi-products of production of positive photoresists—monosodium salt 1,2- naphthoquinondiazide(2)-5-sulfonic acid (Dye M) and 1,2-naphthoquinondiazide(2)-5-sulfochloride (Dye N2), the applicability of the thermal explosion classic theory has been proved. Using experimental kinetic parameters and the heat of decomposition of dyes, parameters of a thermal explosion in adiabatic conditions and convective heat transfer conditions have been calculated. As the analysis of obtained dependences shows, the linear dependence of slow growth (induction period) with time transforms into exponential dependence for each substance. Notably, the heat resistance of Dyes М and N2 is rather low. It has been shown that the slow decomposition of substances in conditions of the missing heat sink can transform into the stage of thermal explosion. The design temperature of self-ignition (flash) of the substance calculated considering the heat sink and the geometry of process equipment is 135 °C for Dye М and 93 °C for Dye N2, which complies with the experimental data. The recommendations on the selection of safe temperatures for drying modes of the studied compounds have been provided.
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