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The effects of cornstalk addition on the product distribution and yields and reaction kinetics of lignite liquefaction

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  • Zhang, Fan
  • Xu, Deping
  • Wang, Yonggang
  • Guo, Xiangkun
  • Xu, Long
  • Fan, Maohong

Abstract

The cornstalk-assisted direct lignite liquefaction was conducted by using a resonance agitation micro-autoclave heated by a salt bath. The effects of reaction temperature (360°C, 390°C, and 420°C) and time (5min, 15min, 30min, and 60min) on the distribution and yields of liquefaction products (asphaltene, preasphaltene, oil, and gas) were investigated. The results show that the reaction temperature has significant effect on the distribution and yields of products in the cornstalk-assisted direct coal liquefaction. At 360°C, the reaction from preasphaltene to asphaltene is the rate-limiting step of the overall co-liquefaction process, while at 420°C the reaction from asphaltene to oil becomes the rate-limiting step. A kinetic model is proposed and the kinetics analysis shows that the activation energy for the reaction from raw material to preasphaltene and asphaltene is 41.9kJ/mol, while that for the reaction from preasphaltene and asphaltene to oil and gas is 61.4kJ/mol. The addition of cornstalk can considerably improve the reaction kinetics of the co-liquefaction of Shengli coal and cornstalk.

Suggested Citation

  • Zhang, Fan & Xu, Deping & Wang, Yonggang & Guo, Xiangkun & Xu, Long & Fan, Maohong, 2014. "The effects of cornstalk addition on the product distribution and yields and reaction kinetics of lignite liquefaction," Applied Energy, Elsevier, vol. 130(C), pages 1-6.
    • Handle: RePEc:eee:appene:v:130:y:2014:i:c:p:1-6
    DOI: 10.1016/j.apenergy.2014.05.033
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    References listed on IDEAS

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    1. He, Chang & Feng, Xiao & Chu, Khim Hoong, 2013. "Process modeling and thermodynamic analysis of Lurgi fixed-bed coal gasifier in an SNG plant," Applied Energy, Elsevier, vol. 111(C), pages 742-757.
    2. Liu, Zhengang & Balasubramanian, Rajasekhar, 2014. "Upgrading of waste biomass by hydrothermal carbonization (HTC) and low temperature pyrolysis (LTP): A comparative evaluation," Applied Energy, Elsevier, vol. 114(C), pages 857-864.
    3. James, Olusola O. & Chowdhury, Biswajit & Auroux, Aline & Maity, Sudip, 2013. "Low CO2 selective iron based Fischer–Tropsch catalysts for coal based polygeneration," Applied Energy, Elsevier, vol. 107(C), pages 377-383.
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    1. Zhu, Zhe & Rosendahl, Lasse & Toor, Saqib Sohail & Yu, Donghong & Chen, Guanyi, 2015. "Hydrothermal liquefaction of barley straw to bio-crude oil: Effects of reaction temperature and aqueous phase recirculation," Applied Energy, Elsevier, vol. 137(C), pages 183-192.

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