CIESC Journal ›› 2019, Vol. 70 ›› Issue (12): 4856-4863.DOI: 10.11949/0438-1157.20190619

• Energy and environmental engineering • Previous Articles     Next Articles

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

Chuanqiang LI1,3(),Siyuan LIU1,Dongsheng WANG2,Shubin LIU1,Xuxu ZHENG1,Xiaoya YUAN1   

  1. 1. School of Materials Science and Technology, Chongqing Jiaotong University, Chongqing 400074, China
    2. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
    3. Guangxi Key Laboratory of Road Structure and Materials, Nanning 530007, Guangxi, China
  • Received:2019-06-04 Revised:2019-09-05 Online:2019-12-05 Published:2019-12-05
  • Contact: Chuanqiang LI

压力反应釜中低温热裂解废旧LLDPE塑料制备PE蜡

李传强1,3(),刘思媛1,王东升2,刘书彬1,郑旭煦1,袁小亚1   

  1. 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
  • 通讯作者: 李传强
  • 作者简介:李传强(1983—),男,博士,副教授,lichuanqiang@cqjtu.edu.cn
  • 基金资助:
    重庆市基础科学与前沿技术研究专项项目(cstc2017jcyjAX0310);重庆市社会事业与民生保障科技创新专项一般项目(cstc2017shmsA1224);重庆市教育委员会科学技术研究项目(KJ1705124);广西道路结构与材料重点实验室开放课题(2017gxjgclkf-002);中国博士后科学基金面上项目(2015M572643XB);重庆市博士后科研项目特别资助项目(Xm2015075)

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.

Key words: linear low-density polyethylene, pressure reactor, pyrolysis, PE wax, kinetics

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。

关键词: 线性低密度聚乙烯, 压力反应釜, 热解, PE蜡, 反应动力学

CLC Number: