A comprehensive study on the effect of the pyrolysis temperature on the products of the flash pyrolysis of waste tires

This study investigates the pyrolysis of tire granulates in an entrained-flow reactor at temperatures ranging from 500 ^°C to 750 ^°C, using two different feedstocks: passenger car tires (PCT) and truck tires (TT). The objective of the experiments is to determine the influence of temperature on the yield and properties of the pyrolysis products, namely pyrolytic carbon black, oil, and gas. The results show that as the temperature increases, the yield of the solid product decreases due to the increased conversion of rubber particles into volatiles. Approximately 90 % conversion is achieved at a temperature of 600 ^°C, after which no significant improvement in volatile conversion is observed. The solid carbon product of the pyrolysis process is compared with commercial N660-grade carbon black in terms of its physicochemical properties, and the results are discussed. An increase in temperature leads to a decrease in oil yield, accompanied by a corresponding increase in gas yield. This increase in gas yield is attributed to the thermal cracking of pyrolysis oil vapors into permanent gases, such as H₂, CH₄ and C₁-C₄ hydrocarbons, at higher temperatures.