Strien Julian R J, Heeres Hero J, Deuss Peter J
Chemical Engineering Department, Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 3, 9747 AG Groningen, the Netherlands.
Chemical Engineering Department, Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 3, 9747 AG Groningen, the Netherlands.
Waste Manag. 2025 Sep;206:115094. doi: 10.1016/j.wasman.2025.115094. Epub 2025 Sep 1.
The pyrolysis of polyolefin (PO)-rich mixed plastic waste represents a promising pathway for recycling plastic waste into liquid hydrocarbons, particularly in the naphtha range, for use as a refinery input. However, assessments of naphtha production from complex plastic waste remain limited. This work systematically investigates the batch pyrolysis of a PO-rich mixed plastic waste derived from a sorted household waste stream (DKR-350) using Design of Experiments (DoE) and response surface methodology (RSM). Oil yield, naphtha-range hydrocarbon yield, and other responses were modelled as functions of relevant processing parameters, such as batch time, temperature, and plastic pre-treatment method. Experiments were conducted in a batch autoclave under various process conditions (380-450 °C, 0-4 h, with varying feedstock pre-treatments, gas types, and pressures). Time and temperature were the most critical factors for achieving the highest oil yield (73% at 420 °C and a batch time of 2.6 h). The highest naphtha yield in the experimental design range was 42% (448 °C, 3.1 h), achieved using a feedstock that had been pre-treated by dry-washing. Additionally, this work gives key insights into the pyrolysis mechanism of plastic waste. For instance, the formation of CO and CO was linked to the presence of specific biogenic and non-polyolefinic impurities at various stages during pyrolysis. The composition of the naphtha fraction also becomes increasingly richer in C-C as pyrolysis severity increases. This work explores the potential of pyrolysis as part of the solution to global plastic waste challenges within a more circular economy.
富含聚烯烃（PO）的混合塑料废料的热解是将塑料废料回收转化为液态烃（尤其是石脑油范围内的烃）以用作炼油厂原料的一条有前景的途径。然而，对复杂塑料废料生产石脑油的评估仍然有限。这项工作使用实验设计（DoE）和响应面方法（RSM）系统地研究了源自分类后的家庭废物流（DKR - 350）的富含PO的混合塑料废料的间歇热解。将油产率、石脑油范围烃产率和其他响应建模为相关加工参数的函数，如间歇时间、温度和塑料预处理方法。实验在间歇式高压釜中于各种工艺条件下进行（380 - 450°C，0 - 4小时，采用不同的原料预处理、气体类型和压力）。时间和温度是实现最高油产率（420°C、间歇时间为2.6小时时为73%）的最关键因素。在实验设计范围内，使用经干洗预处理的原料，最高石脑油产率为42%（448°C，3.1小时）。此外，这项工作还对塑料废料的热解机理提供了关键见解。例如，CO和CO的形成与热解过程中不同阶段特定的生物源和非聚烯烃杂质的存在有关。随着热解程度的增加，石脑油馏分的组成中碳 - 碳键也变得越来越丰富。这项工作探索了热解作为更循环经济中解决全球塑料废料挑战方案一部分的潜力。
