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Development of a microwave thermogravimetric analyzer and its application on polystyrene microwave pyrolysis kinetics
Journal of Analytical and Applied Pyrolysis ( IF 6 ) Pub Date : 2018-01-31
Philippe Leclerc, Jocelyn Doucet, Jamal Chaouki

To study pyrolysis kinetics inside a microwave environment, a microwave thermogravimetric analyzer was developed. A sample mass as low as 0.3 g can be studied along with silicon carbide as the microwave receptor. The temperature is measured with a custom-made infrared thermopile equipped with different optical filters specific to this application. Validation of the microwave thermogravimetric analyzer features showed that the measured data can be used as is for kinetic development. Different heating profiles can be achieved by modulating the microwave power. The microwave thermogravimetric analyzer was then used for the kinetic development of polystyrene microwave pyrolysis. Polystyrene was chosen because of its low recycling rate and its great potential to produce high-valued products, like styrene. Three heating rates (24.5, 38.5 and 49.5 °C min−1) were used to estimate the kinetic parameters. By comparing several reaction models, a random scission model was found to best explain the experimental data. The choice of the reaction model was made based on two statistical tests: the coefficient of determination R2 and the residual sum of squares RSS. With this reaction model, an activation energy of E = 45 kJ mol−1 and a pre-exponential constant of ln(A) = 3.6 were found for polystyrene microwave pyrolysis.



中文翻译:

微波热重分析仪的研制及其在聚苯乙烯微波热解动力学中的应用

为了研究微波环境下的热解动力学,开发了微波热重分析仪。可以研究低至0.3 g的样品质量以及碳化硅作为微波接收器。用定制的红外热电堆测量温度,该红外热电堆配备有针对该应用的不同滤光片。微波热重分析仪功能的验证表明,测得的数据可直接用于动力学开发。通过调制微波功率可以实现不同的加热曲线。然后将微波热重分析仪用于聚苯乙烯微波热解的动力学发展。选择聚苯乙烯是因为它的回收率低,并且具有生产高价值产品(如苯乙烯)的巨大潜力。三种加热速率(最低24.5、38.5和49.5°C-1)用于估计动力学参数。通过比较几种反应模型,发现了一个随机的分裂模型可以最好地解释实验数据。反应模型的选择基于两个统计检验:确定系数R 2和残差平方和RSS。在该反应模型中,发现聚苯乙烯微波热解的活化能为E  = 45 kJ mol -1,指数前常数为ln(A)= 3.6。

更新日期:2018-02-02
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