Abstract This study compared the pyrolysis of waste polypropylene (PP) into fuel products under atmospheric and vacuum pressure conditions at different temperatures and heating rates. Four different temperatures (450, 488, 525 and 600 °C) at slow (15 °C/min) and fast (about 180 °C/min) heating rates were examined on a bench scale reactor. Pyrolysis vapours were recovered as heavy and light fractions by fractional condensation and characterised using GC/MS. Among all temperatures, 488 and 525 °C generated promising yields of condensable products under both atmospheric and vacuum conditions, with total yields in the range of 81–93 wt%. Heating rate effects on product composition distribution were more pronounced under vacuum pyrolysis. Gasoline range compounds predominated in light condensable products recovered under both atmospheric and vacuum pyrolysis. Vacuum suction limited the condensation of gasoline range compounds in the heavy fraction, resulting in Diesel/Gasoline ratio higher than 30. Higher Heating Values (HHVs) of all condensable products recovered under both atmospheric and vacuum conditions ranged between 41 and 46 MJ/kg, with higher values being obtained under milder conditions. Increased production of aromatics explained the lower HHVs obtained at higher temperatures.

中文翻译：

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热解废聚丙烯塑料用于能量回收：加热速率和真空条件对燃料产品组成的影响

摘要 本研究比较了废聚丙烯 (PP) 在大气压和真空压力条件下在不同温度和加热速率下热解成燃料产品的情况。在实验室规模的反应器上检查了四种不同的温度（450、488、525 和 600°C）、慢速（15°C/min）和快速（约 180°C/min）加热速率。热解蒸气通过分级冷凝回收为重馏分和轻馏分，并使用 GC/MS 进行表征。在所有温度中，488°C 和 525°C 在大气和真空条件下产生了有希望的可冷凝产物产率，总产率在 81-93 wt% 的范围内。在真空热解下，加热速率对产品组成分布的影响更为明显。汽油系列化合物在常压和真空热解下回收的轻质可冷凝产品中占主导地位。真空抽吸限制了重馏分中汽油范围化合物的冷凝，导致柴油/汽油比高于 30。 在大气和真空条件下回收的所有可冷凝产品的较高热值 (HHV) 介于 41 和 46 MJ/kg 之间，在更温和的条件下获得更高的值。芳烃产量增加解释了在较高温度下获得的 HHV 较低。在更温和的条件下获得更高的值。芳烃产量增加解释了在较高温度下获得的 HHV 较低。在更温和的条件下获得更高的值。芳烃产量增加解释了在较高温度下获得的 HHV 较低。