Effects of raw material property of coal tar pitch and reaction conditions on particle size distribution and appearance of mesocarbon microbeads

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Industrial application needs mesocarbon microbeads (MCMB) with even particle size distribution and good sphericity, while the reaction conditions and raw material property may influence the MCMB property stated above. MCMB was prepared by thermal polymerization with coal tar pitch as the raw material, with the effects of reaction conditions i.e., the temperature, time and pressure, as well as raw material properties including the soft point and quinolone-insoluble (QI) on the particle size distribution and appearance of MCMB being investigated. The results show that within a certain range, the increase of the reaction temperature or reaction time during thermal polymerization helps the grow of MCMB, and the particle size distribution becomes more narrow with granularity becoming homogeneous. Too low pressure makes the light components of the reaction system escape and the system viscosity quickly increase, which is not conducive to gain the spherical appearance. Low soft points of raw materials and small viscosities of the reaction system are helpful for the free motion and fusion of the microbeads growing to MCMB with even particle sizes. The primary QI in the raw material is the core for the formation and growth of MCMB, and if the particle sizes of the primary QI are too different, the size of MCMB will become uneven with MCMB polarized. The MCMB with even particle sizes can be obtained by removing the QI with too large particle sizes in the raw material.

Keywords coal tar pitch property of raw material reaction condition mesocarbon microbead (MCMB) particle size distribution appearance

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Issue Date: 15 March 2014

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	Jieming XIONG
	Xiao CHEN
	Guojuan SUN
	Minglan GE
	Haiyan HUANG
	Jingfeng YANG

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Jieming XIONG,Xiao CHEN,Guojuan SUN, et al. Effects of raw material property of coal tar pitch and reaction conditions on particle size distribution and appearance of mesocarbon microbeads[J]. Journal of Tsinghua University(Science and Technology), 2014, 54(3): 314-319.

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http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2014/V54/I3/314

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