Evaluation of the properties of tyre pyrolysis oils obtained in a conical spouted bed reactor

摘要

Waste truck tyre valorization by fast pyrolysis has been performed in a conical spouted bed reactor in the 425-575 degrees C range. The tyre pyrolysis oil (TPO) yield was found to decrease with increasing temperature whilst the yield of gas increased. The effect of temperature on TPO properties has been studied in order to establish the best possible valorization route. FTIR and chromatographic analysis revealed the presence of some undesired compounds with sulphur, nitrogen or oxygen functionalities (benzotiatholes, nitriles and carboxylic acids amongst others) and an increase of TPO aromaticity with increasing temperature. The carbon and sulphur content and the heating value of the TPO increased with temperature. The simulated distillation showed that approximately 70% of the TPOs produced at 425 and 475 degrees C correspond to diesel range, whereas that TPO obtained at 575 degrees C is between diesel and gasoline range. The properties of the TPOs evidenced their potential to substitute conventional fuels. However, some of them need to be improved, i.e., by reduction of the sulphur, nitrogen and aromatic content. Additionally, the TPO obtained at 425 and 475 degrees C could be an important source of limonene and that at 575 degrees C of xylenes, although current removal methods present some limitations. (C) 2017 Elsevier Ltd. All rights reserved.