Kinetics of Mesophase Sphere Formation of Toluene Soluble Fraction

Abstract:

The toluene soluble (TS) fraction prepared from a middle-temperature coal tar pitch was subjected to a series of thermal treatments at the various temperatures from 410 °C to 470 °C for different periods of time. The samples obtained after heat treatment was quenched to ambient temperature. Mesophase spheres were separated from the quenched samples using washing oil and quinoline. The kinetics of mesophase sphere formation of the TS fraction was studied, based on the data derived from the time-dependent changes in the mesophase sphere content. It was clarified that the mesophase sphere formation of TS fraction was an autocatalytic type reaction. The rate law and the rate constants for the mesophase sphere formation at holding temperatures of 410°C, 430°C, 450°C and 470°C were determined. The rate constants of the mesophase sphere formation follow the Arrhenius equation. The Arrhenius parameters of the mesophase sphere formation are 200.2 kJ mol^-1 of the activation energy and 2.71x1012 % -1 h-1 of the pre-exponential factor. The treatment temperature had a greater effect on the formation of mesophase spheres than the treatment time.

• Periodical: Advanced Materials Research (Volumes 750-752)
• Pages: 1855-1859
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.750-752.1855
• Online since: August 2013
• Authors: Li Yue*, Xue Fei Zhao, Shi Quan Lai, Xiao Xia Li, Liang Liang Gao, Ke Hou, Han Shi Wang
• Keywords: Coal Tar Pitch, Kinetic, Mesophase Sphere, Toluene Soluble Fraction

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