Characteristics of fractionated drop-in liquid fuel of plastic wastes from a commercial pyrolysis plant

Lee, Doyeon; Nam, Hoseok; Wang, Shuang; Kim, Hana; Kim, Jung-Hwan; Won, Yooseob; Hwang, Byung Wook; Kim, Young Doo; Nam, Hyungseok; Lee, Kyong-Hwan; Ryu, Ho-Jung

Characteristics of fractionated drop-in liquid fuel of plastic wastes from a commercial pyrolysis plant

2021

Pyrolysis is a waste conversion technology to solve an increasing plastic waste issue worldwide. Waste plastic pyrolysis fuel from a commercial-scale pyrolysis plant (10 ton/day) was comprehensively investigated using distillation methods by separating the crude pyrolysis fuel to isolate the diesel-like pyrolysis fuel fraction (C₉–C₂₅ for fraction 2 + fraction 3, middle distillate). Other fractions were C₅–C₁₀ for the light distillate (fraction 1), and >C₂₅ for the heavy distillate (fraction 4). The relationship between the fuel boiling point and liquid vapor temperature were found for designing a scaled-up oil separation process. The diesel grade pyrolysis fuel fraction comprised approximately 70–80% of the crude pyrolysis fuel, wherein it had values of 43–45 MJ/kg, 1–6 cSt, and 12–42 mgKOH/gₒᵢₗ. Meanwhile, the elemental ratios of the crude pyrolysis oil improved to 0.1 for O/C and 1.9 for H/C after separation, close to petroleum fuels (0.0 O/C and 1.95 H/C). The highest relative chemical composition was the olefins (46% in fraction 1 and 41% in fraction 2), whereas the paraffin was approximately 15–20% in the light fraction. Finally, the potential CO₂ reduction for the plastic waste-to-energy process was evaluated, revealing that a total of 0.26 tCO₂/tonwₐₛₜₑ of emissions could be avoided during the waste plastic pyrolysis process.

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