Pyrolytic characteristic and kinetic study of medium-low-temperature coal tar pitch and its components
TONG Yaoxuan
ZHANG Yuzhu
ZHAO Zhening
HE Jiliang
ZHU Yaming
CHENG Junxia
ZHAO Xuefei
Abstract：Medium-low-temperature coal tar pitch was recognized as an important raw material for producing artificial carbon materials.Understanding the pyrolytic characteristics of the medium-low-temperature coal tar pitch is of great significance for the preparation of high-quality medium-low-temperature coal tar pitch based carbon materials.Four kinds 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 pyrolysis activation 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 and BAI 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.Activation energies were 73.99、180.20 and 46.09 kJ/mol,and lg A were 5.82,13.57 and 3.32,respectively.The pyrolysis reaction mechanism of the BAS conformed to the two-dimensional diffusion model,and the optimal pyrolysis mechanism function was G(α)=α+(1-α)ln(1-α),E=85.36 kJ/mol,lg A=6.18.The pyrolysis reaction mechanism of the DMSOI conformed to the two-dimensional diffusion or three-dimensional diffusion model,and the optimal pyrolysis mechanism function was G(α)=[1-(1-α)1/3]2,E=64.42 kJ/mol,lg A=4.00.
Keywords：medium-low-temperature coal tar pitchasphalt componentspyrolysis characteristicspyrolysis kinet-icsdiffusion modelpyrolysis mechanism functionactivation energypyrolysis kinetic parameter
Publication Date：2024-01-10
Pages：10( 1-10 )