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; Joe Zhou; Shiyu Liu; Roger Ruan

doi:10.1016/j.jaap.2021.105213

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, Joe Zhou, Shiyu Liu, Roger Ruan

Bioproducts and Biosystems Engineering

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

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 language	English (US)
Article number	105213
Journal	Journal of Analytical and Applied Pyrolysis
Volume	157
DOIs	https://doi.org/10.1016/j.jaap.2021.105213
State	Published - 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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10.1016/j.jaap.2021.105213

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Fan, L., Su, Z., Wu, J., Xiao, Z., Huang, P., Liu, L., Jiang, H., Zhou, J., Liu, S., & Ruan, R. (2021). Integrating continuous-stirred microwave pyrolysis with ex-situ catalytic upgrading for linear low-density polyethylene conversion: Effects of parameter conditions. Journal of Analytical and Applied Pyrolysis, 157, Article 105213. https://doi.org/10.1016/j.jaap.2021.105213

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

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.",

keywords = "Cracking mechanism, Gas products, Gasoline-range hydrocarbons, LLDPE, Net energy gain",

author = "Liangliang Fan and Zheyang Su and Jiabo Wu and Zhiguo Xiao and Pei Huang and Lei Liu and Haiwei Jiang and Joe Zhou and Shiyu Liu and Roger Ruan",

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: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = aug,

doi = "10.1016/j.jaap.2021.105213",

language = "English (US)",

volume = "157",

journal = "Journal of Analytical and Applied Pyrolysis",

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T1 - Integrating continuous-stirred microwave pyrolysis with ex-situ catalytic upgrading for linear low-density polyethylene conversion

T2 - Effects of parameter conditions

AU - Fan, Liangliang

AU - Su, Zheyang

AU - Wu, Jiabo

AU - Xiao, Zhiguo

AU - Huang, Pei

AU - Liu, Lei

AU - Jiang, Haiwei

AU - Zhou, Joe

AU - Liu, Shiyu

AU - Ruan, Roger

N1 - 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.

PY - 2021/8

Y1 - 2021/8

N2 - 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.

AB - 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.

KW - Cracking mechanism

KW - Gas products

KW - Gasoline-range hydrocarbons

KW - LLDPE

KW - Net energy gain

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

Abstract

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