热聚合温度对煤液化沥青制备中间相沥青的影响

为制备优质的中间相沥青,以煤液化沥青为原料,在不同热聚合温度下制备中间相沥青,采用偏光显微镜、红外光谱仪、XRD、热分析等测试仪器对所得中间相沥青进行分析和表征。结果表明,温度对中间相沥青的收率、形貌和结构影响显著。随着温度升高,中间相沥青的收率降至86.2%,H含量降至3.96%,S含量有所下降,残炭率增大;中间相小球体的尺寸增大,逐渐出现融并现象,最终形成广域型中间相;煤液化沥青中的稠环芳烃、芳香烃的含量明显增加,烷烃成分则明显减少;煤液化沥青中的无定型区含量减少,分子的排列与取向性变好。选择低的热缩聚温度(410~420℃),适当延长反应时间有利于反应方向的控制,从而达到制备优质中间相的目的。

Effect of temperature on the preparation of mesophase pitch from coal liquefaction pitch

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.