Pilot-scale pyrolysis of waste polypropylene to produce plastic pyrolysis oil

SHI Xingshan; LI Fuzheng; LI Xinyu; PIAO Weiling; DENG Kai; CHEN Zhouhai; XUE Weiyang; HE Jitong; HE Songbo

doi:10.11949/0438-1157.20260427

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Pilot-scale pyrolysis of waste polypropylene to produce plastic pyrolysis oil

更新时间：2026-05-26

- Pilot-scale pyrolysis of waste polypropylene to produce plastic pyrolysis oil
- CIESC Journal (2026)
- 作者机构：
  
  1.南京工业大学能源科学与工程学院可循环碳国际联合实验室，江苏南京 211816
  2.中国科学院大连化学物理研究所环境催化工程研究组，辽宁大连 116023
  大连兴环能源科技有限公司，辽宁大连 116317
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260427
  CLC： TQ 519;X 705
- Received：30 March 2026，
  
  Revised：2026-05-20，
  
  Accepted：21 May 2026，
- 稿件说明：
移动端阅览
SHI Xingshan, LI Fuzheng, LI Xinyu, et al. Pilot-scale pyrolysis of waste polypropylene to produce plastic pyrolysis oil[J/OL]. CIESC Journal, 2026.
DOI：

SHI Xingshan, LI Fuzheng, LI Xinyu, et al. Pilot-scale pyrolysis of waste polypropylene to produce plastic pyrolysis oil[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260427.

摘要

聚丙烯废塑料热化学回收是缓解塑料污染与实现资源循环的关键。热解技术可将聚丙烯转化为液态塑料热解油，但实际废塑料产生的热解油杂质含量高、烯烃与芳烃富集，无法直接用作可持续燃料。本研究构建了“热解-精馏-加氢”的组合工艺，并验证了该技术路线的工程放大可行性与产物定向提质潜力。间歇式回转窑中试装置中聚丙烯废塑料热解实验结果表明，在600℃热解温度下，热解油收率约65 wt.%，固体收率约13 wt.%。然而，该热解油中氯、硅、磷等杂质含量严重超标。热解油常压精馏实验富集了碳数分布与航空煤油及轻柴油吻合的C

-C

馏分，收率约14.6 wt.%。然而，其中烯烃及甲基萘含量较高，分别为8.5 wt.%及14.2 wt.%。该馏分催化加氢实验结果表明，在350℃加氢温度和使用Ni-Mo/Y312催化剂条件下，液体收率高达96.5 wt.%以上，产物由棕红色变为无色透明，烯烃含量由85.3%显著降低至1.3wt.%，1-甲基萘和2-甲基萘脱除率分别达到90.3%和50.6%。本研究通过中试规模的“热解-精馏-加氢”全流程工艺验证，为进一步开发废塑料制备可持续燃料的产业化技术提供了工艺参数和放大依据。

Abstract

Chemical recycling of waste polypropylene (PP) is an essential method f

or tackling plastic pollution and supporting a circular economy. Pyrolysis can transform this waste into liquid plastic pyrolysis oil

which

however

contains contaminants and is usually rich in olefins and aromatics

making it unsuitable for direct use as fuel. This work demonstrates a "pyrolysis-distillation-hydrogenation" process and assesses its scalability and potential for product upgrading. Pilot-scale pyrolysis of waste PP in a 3-m³ rotary kiln at 600℃ produced 65 wt.% oil and 13 wt.% solid residue. However

the derived plastic pyrolysis oil (PPO) contained extremely high levels of impurities

such as chlorine

silicon

and phosphorus. Consequently

the PPO was further distilled under atmospheric pressure

with particular emphasis on the concentrated C

-C

fraction

which has a carbon-number range similar to that of jet fuel and diesel. This target fraction yield was 14.6 wt.%

but it still had high levels of olefins (8.5 wt.%) and methylnaphthalenes (14.2 wt.%). Therefore

subsequent catalytic hydrogenation over a Ni-Mo/Y312 catalyst at 350℃ was performed to effectively upgrade this stream. This led to a change in the oil from reddish-brown to water-white

with a yield exceeding 96.5 wt.%

and a significant reduction in olefin content from 85.3% to 1.3 wt.%. Additionally

the removal rates for 1-methylnaphthalene and 2-methylnaphthalene were 90.3% and 50.6%. This pilot-scale validation of the "pyrolysis-distillation-hydrogenation" process provides essential parameter data and serves as a reference for scaling up

supporting the industrial implementation of chemical recycling of waste plastics.

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