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| 基于差示扫描量热法的费托蜡非等温结晶动力学 |
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谢浩东1,2,张帆3,张胜振1,陈胜利2
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(1.北京低碳清洁能源研究院, 北京 102211;2.中国石油大学(北京)化学工程与环境学院, 北京 102249;3.中国石油大学(北京)机械与储运工程学院, 北京 102249)
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| 摘要: |
| 以滴熔点为113、104、92、83、78和 73 ℃的6种窄馏分费托蜡为研究对象,采用差示扫描量热法(DSC)研究其在不同冷却速率下的非等温结晶过程,应用Jeziorny法和莫志深法对结晶动力学参数进行理论预测,通过Kissinger方程计算非等温结晶活化能。结果表明:不同蜡样品的非等温结晶过程相似,并且结晶过程依赖于冷却速率；所采用的动力学模型与试验数据吻合良好,Avrami指数n平均值在1~2之间,说明结晶过程为二次成核,成核后生长形成棒状或纤维状晶体；蜡样品的非等温结晶活化能越小或冷却速率越快,越容易发生结晶。 |
| 关键词: 费托蜡 差示扫描量热法 非等温结晶 结晶动力学 结晶活化能 |
| DOI：10.3969/j.issn.1673-5005.2024.02.024 |
| 分类号: |
| 文献标识码:A |
| 基金项目: |
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XIE Haodong1,2, ZHANG Fan3, ZHANG Shengzhen1, CHEN Shengli2
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(1.National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, China;2.College of Chemical Engineering and Environment in China University of Petroleum(Beijing), Beijing 102249, China;3.College of Mechanical and Transportation Engineering in China University of Petroleum(Beijing), Beijing 102249, China)
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| Abstract: |
| The non-isothermal crystallization process of six narrow fractions Fischer-Tropsch waxes with drop melting points of 113,104, 92,83, 78 and 73 ℃ at different cooling rates were studied by differential scanning calorimetry (DSC). The crystallization kinetic parameters were predicted by Jeziorny method and Mo Zhishen method. The non-isothermal crystallization activation energy was calculated by Kissinger equation. The results show that the non-isothermal crystallization process of different wax samples is similar and the crystallization process depends on the cooling rates. The kinetic model is in good agreement with the experimental data. The average value of Avrami index n is between 1 and 2, indicating that the crystallization process is secondary nucleation, and the rod or fibrous crystals are formed after nucleation. The smaller the non-isothermal crystallization activation energy of wax samples or the faster the cooling rates, the more prone to crystallization. |
| Key words: Fischer-Tropsch wax differential scanning calorimetry non-isothermal crystallization crystallization kinetics crystallization activation energy |
