Regularities of self-propagating high-temperature synthesis in the solid 8-hydroxyquinoline—chloramine B system |
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Authors: | E G Klimchuk G M Avetisyan A A Khodak V T Minasyan K G Gazaryan A S Mukas'yan A G Merzhanov |
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Institution: | (1) Institute of Structural Macrokinetics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation;(2) Institute of Fine Organic Chemistry, Armenian Academy of Sciences, 1 ul. P. Sevaka, 375044 Erevan, Armenia;(3) A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 117813 Moscow, Russian Federation;(4) Institute of Chemical Physics, Armenian Academy of Sciences, 5/2 ul. P. Sevaka, 375044 Erevan, Armenia |
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Abstract: | The regularities of chemical reactions in solid 8-hydroxyquinoline—chloramine B mixtures were studied under conditions of
organic self-propagating high-temperature synthesis (SHS), isothermal reaction, and thermal explosion in the 20–220 °C temperature
range. Comprehensive physicochemical analysis and microstructural study of the reaction products were carried out. The temperature
of SHS initiation (58 °C), the heat of the reaction (129±9 kJ mol−1), the stoichiometric coefficient (1), the maximum temperature (T
max=98–140 °C), and the velocity of SHS wave propagation (u=0.15–0.55 mm s−1) were determined. Depending on the ratio of the reactants (n), a low-temperature non-degeerate stable gasless mode (n≤1,T
max=115 °C,E
a=42 kcal mol−1) and a high-temperature mode (n>1,T
max=140 °C,E
a=0.4 kcal mol−1) are possible for SHS. The SHS affords monohydroxy and monochloro derivatives of 8-hydroxyquinoline, benzenesulfonamide,
NaCl, NaOH, and H2O. The mechanism of the solid-phase reaction at temperatures below 58 °C includes surface, solid-phase, and gas-phase diffusion;
that for SHS is capillary spreading of the hydroxyquinoline melt.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2271–2284, December, 1999. |
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Keywords: | organic self-propagating high-temperature synthesis autowave exothermal process macrokinetics 8-hydroxyquinoline chloramine B organic solid-state chemistry |
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