Pyrolysis of Waste Tires in a Twin-Auger Reactor Using CaO: Assessing the Physicochemical Properties of the Derived Products

This work assesses the effect of adding CaO during pyrolysis waste tires (WT) using a twin-auger reactor on properties derived products. Pyrolysis was conducted in lab-scale facility at temperature 475 °C, solid residence time 3.5 min, WT mass flow rate 1.16 kg/h, and N2 300 mL/min. continuously fed ratios 10, 15, 20 wt %, according to rate, two particle size ranges: fine (105–149 μm) coarse (149–841 μm). The resulting tire oil (TPO) initially characterized terms sulfur content, sample with lowest named TPO[CaO], further studied by different analytical techniques, including GC–MS 1H NMR. gas (TPG) (TPS) related so-called TPG[CaO] TPS[CaO], respectively, were also chromatography, elemental, proximate, XRF analyses, respectively. Lastly, an acid demineralization process carried out remove some inorganic elements TPS[CaO]. addition 15 % resulted reduction TPO 26.10%, while viscosity water content significantly reduced. analysis revealed significant presence benzene, toluene, xylene, limonene both TPO[CaO]. Likewise, NMR suggested increase hydrogen atoms aromatic, naphthenic, olefin structures decrease these paraffinic structures. Similarly, H2 CxHy compounds increased, CO2, CO, H2S decreased TPG[CaO], which supports hypothesis participation several reactions WT. Although ash TPS[CaO] high after (57.5 %), effective removing 80% its improving surface area porosity. information presented this aims providing insights toward advancement situ upgrading strategies for products from