The rubber composition of three different waste tyre crumbs has been predicted using a kinetics model for tyre devolatilisation. The kinetics are based on a sophisticated mechanism which includes two consecutive devolatilisation reactions for the rubbers and a single intermediate condensed product. Activation energies are obtained using model-free kinetics and are subsequently incorporated as fixed values in model-based kinetics. The model has been validated with binary and ternary mixtures of three predominant tyre rubbers (natural polyisoprene, butadiene and styrene-butadiene rubber) and subsequently applied for three waste tyre crumbs consisting of different ratios of passenger car and truck tyres. It turned out that the model is capable of predicting the natural polyisoprene content very accurately. Due to the similarity of butadiene and styrene-butadiene rubber, discriminating quantitatively between these two rubbers is notoriously difficult. The present model is however capable of correctly indicating increasing styrene contents in tyre crumbs. (C) 2015 Elsevier B.V. All rights reserved.
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