A pilot plant provided with a conical spouted bed reactor has been used for the valorisation of waste tires by thermal pyrolysis in continuous mode. The effect of pyrolysis temperature on product distribution and properties has been studied in the temperature range from 425 to 600 °C. This variable has proven to have an important effect on product distribution. Thus, pyrolysis oil yield was reduced from 64.3 wt% at 425 °C to 55.9 wt% at 600 °C. However, the quality of carbon black was improved operating at high temperatures (increasing BET surface area values). High yields of certain interesting chemicals have been obtained in the liquid fraction, such as limonene (19.3 wt%), isoprene (5.7 wt%) and styrene (6.1 wt%). The conical spouted bed reactor is a suitable technology for tire fast pyrolysis in continuous mode. Continuous operation gives way to higher yields of gases and both aromatic and non-aromatic C5-C10 compounds, but lower yields of C11+ fraction. Temperature has an important effect on product distribution by increasing the aromatisation of the volatile fraction and the gas yield. Moreover, the quality of the solid fraction (adulterated carbon black) is improved by operating at high temperatures. The liquid fraction is of suitable quality for its use as fuel or it can be an interesting feedstock for a refinery, especially for the hydrocracking process. Pyrolysis oil contains interesting products in high concentrations depending on the operating conditions, such as limonene, isoprene and BTX fraction. The adulterated carbon black has enough BET surface area for its recycling, but a desulphuration process is needed for this purpose. Furthermore, commercial quality active carbons can be obtained from residual carbon black by means of an activation process.
A conical spouted bed reactor for the valorisation of waste tires
2010
8 Seiten, 3 Bilder, 31 Quellen
Conference paper
English
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