LAUSR

Abstract Anthraquinone nitro compounds are the important intermediate and hazardous waste in dye production. In order to understand the thermal decomposition characteristics of three typical dye wastes: 1-nitroanthraquinone, 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone, the dynamic and isothermal experiments were conducted by differential scanning calorimeter. The dynamic results indicate that these substances are decomposed after melting except for 1,5-dinitroanthraquinone and the specific heat release of these substances is higher than 800 J/g. Calculated by Friedman kinetic analysis, the activation energy of first step decomposition of 1,8-dinitroanthraquinone is consistent with 1-nitroanthraquinone, and the second step decomposition is consistent with the third step of 1,5-dinitroanthraquinone. Refer to the two kinetic models of 1-nitroanthraquinone ("autocatalytic") and 1,5-dinitroanthraquinone ("n-order + autocatalytic + autocatalytic"), the model of "autocatalytic + autocatalytic" were established for 1,8-dinitroanthraquinone. The prediction of the self-accelerating decomposition temperature indicates that coupling of phase transition and decomposition does not increase the thermal risk.