Integrating continuous-stirred microwave pyrolysis with ex-situ catalytic upgrading for linear low-density polyethylene conversion: Effects of parameter conditions

Liangliang Fan, Zheyang Su, Jiabo Wu, Zhiguo Xiao, Pei Huang, Lei Liu, Haiwei Jiang, Wenguang Zhou, Shiyu Liu, Roger Ruan

Research output: Contribution to journalArticlepeer-review

Abstract

A continuous-stirred microwave pyrolysis (CSMP) reactor coupled with an ex-situ catalytic bed was developed for the conversion of linear low-density polyethylene (LLDPE) to high-grade fuels. Effects of catalyst-to-reactant ratio and feeding rate on product yield and chemical selectivity were studied. The CSMP of LLDPE produced up to 84.1 wt.% condensate product composed of hydrocarbon fuels. With the assistance of the ex-situ catalytic process with HZSM-5, more refined chemicals dominated by gasoline-range hydrocarbons (C5–C12 hydrocarbons) were observed. When the catalyst-to-reactant ratio was 15 % and the feeding rate was 6 g/min, the condensate oil with a high higher heating value (45.23 MJ/kg) showed the highest selectivity of gasoline-range hydrocarbons (98.0 %). The pyrolysis processes yielded ethylene as the main gas product. With the addition of HZSM-5, propylene and propane were the primary gas components. The plausible pathway for the conversion of LLDPE mainly proceeded through radical mechanism for pyrolysis and carbenium ion mechanism for catalysis was elaborated. The potential net energy gain increased from 34.16 MJ/kg to 48.91 MJ/kg with growing feeding rate from 6 g/min to 30 g/min.

Original languageEnglish (US)
Article number105213
JournalJournal of Analytical and Applied Pyrolysis
Volume157
DOIs
StatePublished - Aug 2021

Bibliographical note

Funding Information:
This work was supported by National Natural Science Foundation of China (No. 51906096), National Key Research and Development Program of China (2021YFE0104900), Postdoctoral Research Project of Jiangxi Province of China (2019KY21), and the Talent Program for Distinguished Young Scholars of Jiangxi Province of China (20171BCB23015). We would also like to thank the technical support from University of Minnesota Center for Biorefining.

Funding Information:
This work was supported by National Natural Science Foundation of China (No. 51906096 ), National Key Research and Development Program of China ( 2021YFE0104900 ), Postdoctoral Research Project of Jiangxi Province of China ( 2019KY21 ), and the Talent Program for Distinguished Young Scholars of Jiangxi Province of China ( 20171BCB23015 ). We would also like to thank the technical support from University of Minnesota Center for Biorefining .

Publisher Copyright:
© 2021 Elsevier B.V.

Keywords

  • Cracking mechanism
  • Gas products
  • Gasoline-range hydrocarbons
  • LLDPE
  • Net energy gain

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