中低温煤焦油沥青(MLP)为人造炭材料的重要原料,研究其组分的热解特性及动力学对高品质中低温煤焦油沥青基炭材料的制备具有重要意义。以中低温煤焦油沥青为原料,分别采用正丁醇(BA)和二甲基亚砜(DMSO)为萃取剂以获得4种沥青组分,通过热重分析仪对中低温煤焦油沥青和4种族组分的热解行为进行研究,利用Flynn-Wall-Ozawa法、Kissinger-Akahira-Sunose法和Satava-Sestak法计算热解活化能以及热解动力学参数。结果表明:MLP、DMSOS、BAI组分的热解反应机理符合随机成核及其后续增长模型,最佳热解机理函数分别为G(α)=[-ln(1-α)]4/3、G(α)=[-ln(1-α)]4、G(α)=[-ln(1-α)]2,活化能分别为73.99、180.20、46.09kJ/mol,lgA分别为5.82、13.57、3.32;BAS组分的热解反应机理符合二维扩散模型,最佳热解机理函数为G(α)=α+(1-α)ln(1-α),E=85.36kJ/mol,lgA=6.18;DMSOI组分的热解反应机理符合二维扩散或三维扩散模型,最佳热解机理函数为G(α)=[1-(1-α)1/3]2,E=64.42kJ/mol,lgA=4.00。

Medium⁃low⁃temperature coal tar pitch was recognized as an important raw material for producing artificialcarbon materials. Understanding the pyrolytic characteristics of the medium⁃low⁃temperature coal tar pitch is of greatsignificance for the preparation of high⁃quality medium⁃low⁃temperature coal tar pitch based carbon materials. Fourkinds of pitch components were obtained with the medium⁃low⁃temperature coal tar pitch as raw materials, and n⁃buta⁃nol (BA) and dimethyl sulfoxide (DMSO) as extracts, respectively. The pyrolysis behavior of medium⁃low⁃tempera⁃ture coal tar pitch and 4 kinds of group components was investigated by the thermogravimetric analyzer. The pyrolysisactivation energies and pyrolysis kinetic parameters were calculated using the Flynn⁃Wall⁃Ozawa, Kissinger⁃Akahira⁃Sunose and Satava⁃Sestak methods. The results showed that the pyrolysis reaction mechanisms of the MLP, DMSOS andBAI conformed to the random nucleation and its subsequent growth model, and the optimal pyrolysis mechanism func⁃tions were G (α) = [-ln (1-α) ]4/ 3, G (α) = [-ln (1-α) ]4 and G (α) = [-ln (1-α) ]2. Activationenergies were 73. 99、 180. 20 and 46. 09 kJ/ mol, and lg A were 5. 82, 13. 57 and 3. 32, respectively. The pyrolysisreaction mechanism of the BAS conformed to the two⁃dimensional diffusion model, and the optimal pyrolysis mechanismfunction was G (α) = α+ (1-α) ln (1-α), E = 85. 36 kJ/ mol, lg A = 6. 18. The pyrolysis reaction mechanism ofthe DMSOI conformed to the two⁃dimensional diffusion or three⁃dimensional diffusion model, and the optimal pyrolysismechanism function was G (α) = [1- (1-α)1/ 3]2, E=64. 42 kJ/ mol, lg A=4. 00.