The 7·106 t of waste tires that are generated yearly represent for a potential source of fuels considering its composition, rich in C and H, and its chemical features. Waste tires can be recycled through several processes aiming for either material, energy, or chemical product recovery. In this work we review the current status of these valorization pathways, with a particular focus on pyrolysis, its main products and their characteristics. Despite the extended reviews on the pyrolysis of tires, scarce material is available regarding the possibilities that scrap tires pyrolysis oil (STPO) offers and its limitations. STPO is both the most economically and energetically attractive product, and its composition (as obtained by different authors) is analyzed in this work, finding that the main barriers to solve for its direct implementation are (i) high sulfur content, (ii) high content of aromatics and (iii) high proportion of heavy molecules (>350 °C). From an industrial perspective, a sequential 2-stage hydrotreating-hydrocracking strategy has been proposed for STPO upgrading in order to simultaneously overcoming all these limitations and produce high quality fuels.
|Original language||English (US)|
|Number of pages||15|
|Journal||Renewable and Sustainable Energy Reviews|
|State||Published - Apr 2016|
Bibliographical noteFunding Information:
This work was carried out with the financial support of the Ministry of Economy and Competitivity of the Spanish Government ( CTQ2010-19623 and CTQ2012-35192 ), the ERDF funds, the Basque Government ( SAIOTEK SA-2011/00098 , SA-2013/00173 and IT748-13 ), and the University of the Basque Country ( UFI 11/39 ). Idoia Hita is also grateful for her Basque Government Research Training grant ( BFI2010-223 ).
© 2015 Elsevier Ltd.
- Automotive fuels
- Scrap tires pyrolysis oil
- Waste tires
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment