Effect of temperature on the preparation of mesophase pitch from coal liquefaction pitch
Chang Hongyan
Zhang Yuanxin
Li Kejian
Zhang Xuwen
Cheng Shifu
Abstract：In order to prepare high quality mesophase pitch,coal liquefaction pitch was used as raw material and mesophase pitch was prepared at different temperature.Polarized light microscopy,infrared spectroscopy,X-ray diffraction,thermal gravimetric analyzer were used to test and characterize the mesophase pitch.Results show that temperature has a significant influence on the pitch yield,morphology and texture of mesophase pitch.With the increasing of temperature,the yield of H,S and mesophase pitch content decrease,while the residual carbon rate increases.With the mesophase spherule size increasing and the gradual emergence thawing,the pitch eventually form wide range mesophase.The content of polycyclic aromatic hydrocarbons,aromatic hydrocarbons in coal liquefaction pitch increase significantly,however,the alkane component significantly decreases.The amorphous area reduces as a result,arrangement and orientation of the molecules become well distribution.Lower thermal polymerization temperature (410-420 ℃) and longer reaction time are used to optimize the direction of the reaction,so as to achieve the purpose of preparing high quality mesophase pitch.
Keywords：thermal polymerization temperaturecoal liquefaction pitchmesophase pitchdirect coal liquefaction
Publication Date：2017-01-01