Coke and Chemistry

, Volume 61, Issue 10, pp 384–391 | Cite as

Study on Reaction Behavior of Tar from Lignite Pyrolysis

  • Wenhao YuEmail author
  • Kai Zhang
  • Zhiping LeiEmail author
  • Hengfu Shui
  • Shibiao Ren
  • Zhicai Wang
  • Shigang Kang
  • Chunxiu Pan


Coal tar from lignite pyrolysis is prone to react during the transportation, heating and upgrading processing, which significantly affects the yield and quality of coal tar. From the view of industry, it is of significance to study the coal tar reactivity during heating. In this paper, the effects of reaction temperature and retention time on reaction of tar were studied. It is found that the influence of the heating temperature on the tar reaction is more significant than the heating time. With the increase of reaction temperature, the yield of coke and gas significantly increased. The content of light and heavy components in the reacted tar is decreased with the increase of reaction temperature. The composition of light tar obtained from tar reaction was also affected by the reaction temperature and retention time. The content of aliphatics, aromatics and phenolics decreased with the increase of temperature. However, when the retention time was 10 s, the content of phenolic compounds increased first and then decreased with the increase of temperature, the highest content at 550°C is 3.4%, and reaches the lowest at 750°C is 0%.


tar reactivity reaction temperature retention time 



This work was supported by the Key Project of Coal Joint Fund from the Natural Science Foundation of China and Shenhua Group Corporation Limited (Grant U1261208), the Natural Scientific Foundation of China (Grants 21476002, 21476003, 21476004, 21176001, U1361125, 21076001, 51174254, 20936007). Authors are also appreciative for the financial supports from State Key Laboratory Breeding Base of Coal Science and Technology Co-founded by Shanxi Province and the Ministry of Science and Technology.


  1. 1.
    Energy Resources 2009: Reserves, Resources, Availability. Crude Oil, Natural Gas, Coal, Nuclear Fuels, Geothermal Energy, Hanover: Bundesanstalt Geowissenschaften Rohstoffe, 2009.Google Scholar
  2. 2.
    Wang, J.G., Lu, X.S., Yao, J.Z., et al., Experimental study of coal topping process in a downer reactor, Ind. Eng. Chem. Res., 2005, vol. 44, no. 3, pp. 463–470.CrossRefGoogle Scholar
  3. 3.
    Lei, Z.P., Zhang, K., Hu, Z.Q., et al., Effect of ionic liquid 1-butyl-3-methyl-imidazolium dihydrogen phosphate pretreatment on pyrolysis of Shengli lignite, Fuel Process. Technol., 2016, vol. 147, pp. 26–31.CrossRefGoogle Scholar
  4. 4.
    Lei, Z.P., Hu, Z.Q., Zhang H., et al., Pyrolysis of lignite following low temperature ionic liquid pretreatment, Fuel, 2016, vol. 166, pp. 124–129.CrossRefGoogle Scholar
  5. 5.
    Wu, J.F., Liu, Q.Y., Wang, R.X., et al., Coke formation during thermal reaction of tar from pyrolysis of a subbituminous coal, Fuel Process. Technol., 2017, vol. 155. pp. 68–73.CrossRefGoogle Scholar
  6. 6.
    Edwards, J.E., Schluter, K., and Tyler, R.J., Upgrading of flash pyrolysis tars to synthetic crude oil: 1. First stage hydrotreatment using a disposable catalyst, Fuel, 1985, vol. 64, no. 5, pp. 594–599.CrossRefGoogle Scholar
  7. 7.
    He, W.J., Liu, Z.Y., Liu, Q.Y., et al, Behaviors of radical fragments in tar generated from pyrolysis of 4 coals, Fuel, 2014, vol. 134, pp. 375–380.CrossRefGoogle Scholar
  8. 8.
    Howard, J.B., Fundamentals of coal pyrolysis and hydropyrolysis, in Chemistry of Coal Utilization, New York: Wiley, 1981.Google Scholar
  9. 9.
    He, W.J., Liu, Q.Y., Shi, L., et al., Understanding the stability of pyrolysis tar from biomass in a view point of free radical, Bioresour. Technol., 2014, vol. 156, no. 3, pp. 372–375.CrossRefGoogle Scholar
  10. 10.
    Niksa, S., A reaction mechanism for tar decomposition at moderate temperatures with any coal type, Fuel, 2017, vol. 193, pp. 467–476.CrossRefGoogle Scholar
  11. 11.
    Kannari, N., Oyama, Y., and Takarada, T., Catalytic decomposition of tar derived from biomass pyrolysis using Ni-loaded chicken dropping catalysts, Int. J. Hydrogen Energy, 2017, vol. 42, no. 15, pp. 9611–9618.CrossRefGoogle Scholar
  12. 12.
    Song, Y., Xiang, J., Hu, S., et al., Importance of the aromatic structures in volatiles to the in-situ destruction of nascent tar during the volatiles-char interactions, Fuel Process. Technol., 2015, vol. 132, pp. 31–38.CrossRefGoogle Scholar
  13. 13.
    LeBlanc, J., Quanci, J.F., Castaldi, M.J., et al., Investigating secondary pyrolysis reactions of coal tar via mass spectrometry techniques, Energy Fuels, 2017, vol. 31, no. 2, pp. 1269–1275.CrossRefGoogle Scholar
  14. 14.
    Han, L.N., Zhang, R., and Bi, J.C., Experimental investigation of high-temperature coal tar upgrading in supercritical water, Fuel Process. Technol., 2009, vol. 90, no. 2, pp. 292–300.CrossRefGoogle Scholar
  15. 15.
    Sonoyama, N., Nobuta, K., Kimura, T., et al., Production of chemicals by cracking pyrolytic tar from Loy Yang coal over iron oxide catalysts in a steam atmosphere, Fuel Process. Technol., 2017, vol. 92, no. 4, pp. 771–775.CrossRefGoogle Scholar
  16. 16.
    Hesp, W.R. and Waters, P.L., Thermal cracking of tars and volatile matter from coal carbonization, Ind. Eng. Chem. Prod. Res. Dev., 1970, vol. 9, no. 2, pp. 194–202.CrossRefGoogle Scholar
  17. 17.
    Yan, L.J., Bai, Y.H., Zhao, R.F., et al., Correlation between coal structure and release of the two organic compounds during pyrolysis, Fuel, 2015, vol. 145, pp. 12–17.CrossRefGoogle Scholar
  18. 18.
    Ignasiak, B.S. and Gawlak, M., Polymeric structure of coal. 1. Role of ether bonds in constitution of high-rank vitrinite, Fuel, 1977, vol. 56, no. 2, pp. 216–222.CrossRefGoogle Scholar
  19. 19.
    Siskin, M. and Aczel, T., Pyrolysis studies on the structure of ethers and phenols in coal, Fuel, 1983, vol. 62, no. 11, pp. 1321–1326.CrossRefGoogle Scholar

Copyright information

© Allerton Press, Inc. 2018

Authors and Affiliations

  • Wenhao Yu
    • 1
    Email author
  • Kai Zhang
    • 1
  • Zhiping Lei
    • 1
    • 2
    Email author
  • Hengfu Shui
    • 1
  • Shibiao Ren
    • 1
  • Zhicai Wang
    • 1
  • Shigang Kang
    • 1
  • Chunxiu Pan
    • 1
  1. 1.School of Chemistry & Chemical Engineering, Anhui Key Laboratory of Coal Clean Conversion & Utilization, Anhui University of TechnologyMa’anshanPR China
  2. 2.Key Laboratory Breeding Base of Coal Science and Technology Co-founded by Shanxi Province and the Ministry of Science and Technology, Taiyuan University of TechnologyTaiyuanChina

Personalised recommendations