from 01.01.1974 until now
Yaroslavl, Yaroslavl, Russian Federation
Volgograd, Volgograd, Russian Federation
Moscow, Moscow, Russian Federation
Volzhskiy, Vologda, Russian Federation
The paper presents the kinetic model of polymer thermodegradation as applied to the process of pyrolysis of worn-out tyres and waste rubber products in an industrial reactor. We calculated the quantum-chemical changes of thermodynamic functions for the probable chemical reactions of mesh elastomer degradation. Solid fraction (carbon black and metal wastes) and vapor-gas mixture separated into three hydrocarbon fractions considered as the reaction products. We use a formal kinetic scheme when describing the kinetics of rubber degradation. It shows the mechanism of the process as a set of radical-chain reactions of polymer degradation. Each hydrocarbon fraction corresponds to a certain set of kinetic constants, the temperature dependences of which are assumed to be Arrhenius. The satisfactory agreement of the obtained calculated thermogravimetric de-pendences with the experimental data of different authors allowed us to approximate the rubber thermal degradation curves by the curves characterizing the general-purpose rubbers.
worn tyres, rubber waste, pyrolysis, kinetic model, quantum-chemical calculation
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