Preparation of PE wax by pyrolysis of LLDPE waste plastic in a pressure reactor under low temperature

LI Chuanqiang; LIU Siyuan; WANG Dongsheng; LIU Shubin; ZHENG Xuxu; YUAN Xiaoya

doi:10.11949/0438-1157.20190619

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Preparation of PE wax by pyrolysis of LLDPE waste plastic in a pressure reactor under low temperature

Energy and environmental engineering | 更新时间：2026-07-24

- Preparation of PE wax by pyrolysis of LLDPE waste plastic in a pressure reactor under low temperature
- CIESC Journal Vol. 70, Issue 12, Pages: 4856-4863(2019)
- 作者机构：
  
  1.重庆交通大学材料科学与工程学院，重庆 400074
  2.重庆交通大学土木工程学院，重庆 400074
  3.广西道路结构与材料重点实验室，广西南宁 530007
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190619
  CLC： TQ 031.3
- Received：04 June 2019，
  
  Revised：2019-09-05，
  
  Online First：09 June 2020，
  
  Published：05 December 2019
- 稿件说明：
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李传强, 刘思媛, 王东升, 刘书彬, 郑旭煦, 袁小亚. 压力反应釜中低温热裂解废旧LLDPE塑料制备PE蜡[J]. 化工学报, 2019, 70(12): 4856-4863

LI Chuanqiang, LIU Siyuan, WANG Dongsheng, LIU Shubin, ZHENG Xuxu, YUAN Xiaoya. Preparation of PE wax by pyrolysis of LLDPE waste plastic in a pressure reactor under low temperature[J]. CIESC Journal, 2019, 70(12): 4856-4863
李传强, 刘思媛, 王东升, 刘书彬, 郑旭煦, 袁小亚. 压力反应釜中低温热裂解废旧LLDPE塑料制备PE蜡[J]. 化工学报, 2019, 70(12): 4856-4863 DOI： 10.11949/0438-1157.20190619.

LI Chuanqiang, LIU Siyuan, WANG Dongsheng, LIU Shubin, ZHENG Xuxu, YUAN Xiaoya. Preparation of PE wax by pyrolysis of LLDPE waste plastic in a pressure reactor under low temperature[J]. CIESC Journal, 2019, 70(12): 4856-4863 DOI： 10.11949/0438-1157.20190619.

摘要

以废旧线性低密度聚乙烯（LLDPE）为原料，采用压力反应釜在封闭条件下通过热裂解方法制备聚乙烯蜡（PE蜡），研究了裂解时间、温度和压力对产物的产率、分子量和滴熔点的影响，并通过红外光谱对产物的官能团进行了分析。实验结果表明，在裂解时间为15~60 min，裂解温度约为260℃的条件下，LLDPE裂解所得到的PE蜡性能较佳，其主要成分为直链烷烃和烯烃，滴熔点大于100℃，黏均分子量处于1400~4700；由动力学分析可知，由于封闭反应体系增加了反应压力，降低了裂解温度和活化能，促进了LLDPE裂解反应进行，同时抑制了气体分子的产生，有利于获得PE蜡。

Abstract

The thermal pyrolysis of liner low density polyethylene (LLDPE) has been carried out in a closed pressure reactor. The effects of pyrolysis temperature

residence time and reactor pressure on the yield

molecular weight and melting point of the products were investigated. The characterization of the products has been carried out using Fourier transform infrared (FTIR) spectroscopy. The results indicate that the PE wax obtained under the conditions of residence time of 15—60 min and pyrolysis temperature of ~260℃ exhibited better performance

with the melting point above 100℃ and the molecular weight of between 1400 and 4700. The FTIR show that the main components are linear alkanes and olefins. According to the kinetic analysis

since the closed reaction system increased the reaction pressure

the pyrolysis temperature and activation energy were reduced

the LLDPE cracking reaction was promoted

and the generation of gas molecule was suppressed

which facilitated the formation of PE wax.

关键词

Keywords

references

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