基于差示扫描量热法的费托蜡非等温结晶动力学
Non-isothermal crystallization kinetics of Fischer-Tropsch wax based on differential scanning calorimetry
谢浩东 1张帆 2张胜振 3陈胜利4
作者信息
- 1. 北京低碳清洁能源研究院, 北京 102211;中国石油大学(北京)化学工程与环境学院, 北京 102249
- 2. 中国石油大学(北京)机械与储运工程学院, 北京 102249
- 3. 北京低碳清洁能源研究院, 北京 102211
- 4. 中国石油大学(北京)化学工程与环境学院, 北京 102249
- 折叠
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.
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 crystalliza-tion 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 a-greement with the experimental data.The average value of Avrami index n is between 1 and 2,indicating that the crystalliza-tion process is secondary nucleation,and the rod or fibrous crystals are formed after nucleation.The smaller the non-isother-mal crystallization activation energy of wax samples or the faster the cooling rates,the more prone to crystallization.
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Key words
Fischer-Tropsch wax/differential scanning calorimetry/non-isothermal crystallization/crystallization kinetics/crystallization activation energy引用本文复制引用
基金项目
国家能源投资集团科技创新项目(ST930019SH10)
国家能源投资集团科技创新项目(ST930020SH08)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据