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Effect of Metal Compounds and Experimental Conditions on Distribution of Products from PVC Pyrolysis

机译：金属化合物和实验条件对PVC热解产物分布的影响

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摘要

Effects of heating rate, gas flow rate, and type of metal compounds on the amount of hydrogen chloride, liquid, gas, and solid pyrolyzate obtained from the pyrolysis of poly(vinyl chloride) (PVC) were investigated. The pyrolysis experiments were carried out in both a thermogravimetric analysis (TGA) instrument and a fixed-bed reactor. Products from the fixed-bed reactor were collected and analyzed by using Fourier transform infrared spectroscopy (FTIR), gas chromatography-mass spectroscopy (GC-MS), titration technique, and gravimetry. It was found that heating rate in the TGA experiments did not affect the amount of released hydrogen chloride. However, the TGA profiles significantly changed with the rate. The onset of dehydrochlorination increased with the rate. In addition, as the heating rate was increased from 10 to 20℃/min, there was no solid residue left. The amount of liquid pyrolyzate obtained from the fixed-bed reactor can be either increased or decreased with the heating rate, depending on the gas flow rate and the actual residence time in the reactor. FTIR and GC-MS analysis indicated that the liquid pyrolyzates were mainly benzene, toluene, and styrene. By comparing the efficiency of various metal compounds in trapping the HCl, it was found that Ca(OH)_2 was more efficient than Mg(OH)_2, and that CaO was more efficient than MgO. These results are discussed in light of the reaction mechanism between HCl and the metal compounds.
机译：研究了加热速率，气体流速和金属化合物的种类对通过热分解聚氯乙烯（PVC）获得的氯化氢，液体，气体和固体热解产物的量的影响。热解实验是在热重分析（TGA）仪器和固定床反应器中进行的。收集固定床反应器中的产物，并使用傅里叶变换红外光谱（FTIR），气相色谱-质谱（GC-MS），滴定技术和重量分析法进行分析。发现在TGA实验中的加热速率不影响释放的氯化氢的量。但是，TGA曲线随速率显着变化。脱氯化氢的发生随着速率的增加而增加。另外，随着加热速率从10℃/ min增加到20℃/ min，没有固体残留物。从固定床反应器获得的液体热解产物的量可以随加热速率而增加或减少，这取决于气体流速和反应器中的实际停留时间。 FTIR和GC-MS分析表明，液体热解产物主要是苯，甲苯和苯乙烯。通过比较各种金属化合物捕集HCl的效率，发现Ca（OH）_2比Mg（OH）_2更有效，而CaO比MgO更有效。根据HCl与金属化合物之间的反应机理讨论了这些结果。

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