MODELLING OF RUBBER THERMAL DEGRADATION KINETICS DURING THE PYROLYSIS OF RUBBER WASTE
Abstract and keywords
Abstract (English):
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.

Keywords:
worn tyres, rubber waste, pyrolysis, kinetic model, quantum-chemical calculation
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