Thermal Conversion Characteristics of Coal Tar Soft Pitch at Atmospheric and Elevated Pressures


Article Preview

Coal tar soft pitch (CTSP) used as raw material of preparing needle coke was heat-treated at 460, 480 and 500 °C for different holding time under the pressure of 0 MPa and 0.25 MPa. The changes of group compositions such as toluene solubles (TS), toluene insolubles-quinoline solubles (TI-QS) and quinoline insolubles (QI) were mainly studies during the thermal conversion of the CTSP. The microstructure morphologies of some calcined cokes were characterized by scanning electron microscope (SEM). The results showed that the thermal conversion of the CTSP had the features of consecutive reaction, and the pressure could accelerate the conversion rate of TS and TI-QS and the formation rate of QI. The calcined coke derived from the semi-coke obtained at atmospheric pressure exhibited better and longer streamlined fiber structures than that of the semi-coke obtained at elevated pressure, while the latter possessed more compact carbon structures than the former.



Edited by:

Z.S. Liu, L.P. Xu, X.D. Liang, Z.H. Wang and H.M. Zhang




L. Yue et al., "Thermal Conversion Characteristics of Coal Tar Soft Pitch at Atmospheric and Elevated Pressures", Advanced Materials Research, Vol. 1015, pp. 467-471, 2014

Online since:

August 2014




* - Corresponding Author

[1] Xianglin Cheng, Qingfang Zha, Jingtao Zhong, Xiaojun Yang. Needle coke formation derived from co-carbonization of ethylene tar pitch and polystyrene [J]. Fuel, 2009, 88: 2188-2192.


[2] Shigui Zhao, Baocheng Wang and Quan Sun. Effect of physical disturbance on the structure of needle coke [J]. Chinese Physical B, 2010, 19(10): 1-5.

[3] Xiong Jieming, Fang Guo, Ge Minglan, Zhai Yanqing. Preparation of High quality needle coke from FCC decant oil [C]. International Conference on Solid State and Materials, 2012, 22: 6-13.

[4] Xuefei Zhao, Shiquan Lai, Yaru Zhang, Shulin Liu, Lijuan Gao and Hongwu Yu. Preparation and structural characterization of a needlelike carbon from the refined coal tar pitch [J]. Key Engineering Materials, 2008, 368-372: 282-283.


[5] Humala Paulus Halim, Ji Sun Im and Chul Wee Lee. Preparation of needle coke from petroleum by-products [J]. Carbon Letters, 2013, 14 (3): 152-161.


[6] Li Yue, Xuefei Zhao, Shiquan Lai, Xiaoxia Li, Liangliang Gao, Ke Hou and Hanshi Wang. Kinetics of mesophase sphere formation of toluene soluble fraction [J]. Advanced Materials Research, 2013, 750-752: 1855-1859.


[7] Yasuhiro Nesumi, Yoshio Todo, Takashi Oyama, Isao Mochida, Yozo Korai. Carbonization in the tube bomb leading to needle coke: II. Mechanism of cocarbonization of a petroleum vacuum residue and a FCC-decant oil [J]. Carbon, 1989, 27 (3): 367-373.


[8] Isao Mochida, You Qing Fei, Yozo Korai, Kenichi Fujimoto, Ryo Yamashita. Carbonization in the tube bomb leading to needle coke: III. Carbonization properties of several coal-tar pitches [J]. Carbon, 1989, 27 (3): 375-380.