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Chemistry and Industry of Forest Products ›› 2019, Vol. 39 ›› Issue (3): 34-42.doi: 10.3969/j.issn.0253-2417.2019.03.005

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Synergistic Effect of Co-pyrolysis of Biomass and Plastics

Shiqi LIU,Suping ZHANG*(),Taili YU,Qinjie CAI   

  1. Laboratory of Coal Gasification and Energy and Chemical Engineering, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China
  • Received:2019-02-28 Online:2019-06-28 Published:2019-06-26
  • Contact: Suping ZHANG E-mail:zsp@ecust.edu.cn
  • Supported by:


The co-pyrolysis activities of sawdust/low-density polyethylene(LDPE) were studied in fixed-bed reactor. The effect of temperature on the co-pyrolysis behavior was also investigated by comparing with sawdust and LDPE individually. The results showed that the bio-oil yield could be effectively improved by the co-pyrolysis process, the maximum bio-oil yield(56.84%) was obtained at 600℃, which was 6.44 percentage point higher than the theoretical value. The composition of biomass and LDPE co-pyrolysis liquid products was analyzed by GC-MS. It was found that the bio-oil components produced by co-pyrolysis were mainly aliphatic hydrocarbons, alcohols and phenols. Some specific components, such as undecanol, heptenal and other oxygen-containing long-chain compounds, were also produced during the co-pyrolysis process, which was the product of free radical interaction between biomass and LDPE. The synergistic effect of co-pyrolysis of sawdust and LDPE was studied by thermogravimetry-infrared spectroscopy. The results showed that the maximum reaction rate temperature during co-pyrolysis was 490℃, which was about 22℃ lower than 512℃, which was the temperature of maximum reaction rate in LDPE individual pyrolysis. The hydroxyl radical generated during the lignin cracking process combining with the small molecular produced by the cleavage of LDPE formed undecanol, octyl-phenol and the like, and the furans and aldehydes formed during the pyrolysis of cellulose were reacted with the resulting CnHm formed by cleavage of LDPE to obtain the substances such as 2-butyltetrahydrofuran, heptenal, dodecanal or the like.

Key words: biomass, co-pyrolysis, low density polyethylene, bio-oil

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