Regularities of self-propagating high-temperature synthesis in the solid 8-hydroxyquinoline—chloramine B system

Autor: A. S. Mukas'yan, A. A. Khodak, K. G. Gazaryan, G. M. Avetisyan, V. T. Minasyan, Alexander G. Merzhanov, E. G. Klimchuk
Rok vydání: 1999
Předmět:
Zdroj: Russian Chemical Bulletin. 48:2245-2258
ISSN: 1573-9171
1066-5285
DOI: 10.1007/bf02498267
Popis: 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 (Tmax=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,Tmax=115 °C,Ea=42 kcal mol−1) and a high-temperature mode (n>1,Tmax=140 °C,Ea=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.
Databáze: OpenAIRE
Externí odkaz: