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中低温煤焦油沥青组分的热解特性及动力学研究

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  • 国家科技期刊平台
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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。09 kJ/mol，lg A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。36 kJ/mol，lg A=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。42 kJ/mol，lg A=4。00。
Pyrolytic characteristic and kinetic study of medium-low-temperature coal tar pitch and its components
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.

medium-low-temperature coal tar pitchasphalt componentspyrolysis characteristicspyrolysis kinet-icsdiffusion modelpyrolysis mechanism functionactivation energypyrolysis kinetic parameter

仝曜暄、张玉柱、赵振宁、何继良、朱亚明、程俊霞、赵雪飞

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辽宁科技大学 化工学院, 辽宁 鞍山 114051

辽宁省先进煤焦化及煤资源高效利用工程研究中心, 辽宁 鞍山 114051

中低温煤焦油沥青 沥青组分 热解特性 热解动力学 扩散模型 热解机理函数 活化能 动力学参数

国家自然科学基金资助项目辽宁省自然科学基金资助项目辽宁省自然科学基金资助项目辽宁科技大学大学生创新创业基金资助项目

222081382021-MS-3062021-BS-2452024-187

2024

10.3969/j.issn.1007-7677.2024.01.001

煤质技术
煤炭科学研究总院

煤质技术

影响因子：0.393
ISSN：1007-7677
年,卷(期)：2024.39(1)
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