National Center of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan.
National Center of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan.
Waste Manag. 2019 Apr 1;88:236-247. doi: 10.1016/j.wasman.2019.03.035. Epub 2019 Mar 27.
In the present study polystyrene waste (PS) was collected from a drop off site in a local market and pyrolyzed at heating rates of 5, 10, 15 and 20 °C/min and temperature range 40-600 °C under nitrogen condition. The apparent activation energy (Ea) and pre-exponential factor (A) were determined using 6 different kinetic methods. Activation energy and pre-exponential factor were found in the range of 82.3 - 202.8 kJmol and 3.5 × 10-7.6 × 10 min respectively. The results demonstrated that the calculated values of Ea and A vary with fraction of conversion, heating rates and the applied model. Moreover, pyrolysis of waste polystyrene was carried out in an indigenously manufactured furnace at temperatures ranging from 340 to 420 °C. The composition of liquid and gaseous fractions was determined using gas chromatography-mass spectrometry. Temperature and reaction time were optimized and the results revealed that temperature of 410 °C and exposure time of 70 min are the best conditions for maximum fuel oil production. Methane and ethane were found as the main products in the gas phase constituting about 82% of the gaseous fraction. The liquid products composed of broad range of C - C hydrocarbons depending on the pyrolytic parameters. A comparison of the composition of pyrolysis oil with standard parameters of diesel, gasoline and kerosene oil suggested that pyrolysis oil from polystyrene waste holds great promise for replacing fuel oil.
在本研究中，从当地市场的一个丢弃点收集了聚苯乙烯废料（PS），并在氮气条件下以 5、10、15 和 20°C/min 的加热速率在 40-600°C 的温度范围内进行热解。使用 6 种不同的动力学方法确定了表观活化能（Ea）和指前因子（A）。发现活化能和指前因子的范围分别为 82.3-202.8 kJmol 和 3.5×10-7.6×10min。结果表明，Ea 和 A 的计算值随转化率、加热速率和应用模型的变化而变化。此外，在自制的炉中在 340 至 420°C 的温度范围内进行了废聚苯乙烯的热解。使用气相色谱-质谱法测定了液体和气体馏分的组成。优化了温度和反应时间，结果表明，410°C 的温度和 70 分钟的暴露时间是获得最大燃料油产量的最佳条件。甲烷和乙烷是气相中的主要产物，占气态馏分的约 82%。液体产物由宽范围的 C-C 烃组成，取决于热解参数。将热解油的组成与柴油、汽油和煤油的标准参数进行比较表明，废聚苯乙烯热解油有望替代燃料油。
