Thermo-catalytic pyrolysis is considered as a promising process for the chemical recycling of waste polymeric materials aiming at converting them into their original monomers or other valuable chemicals. In this regard, process parameters and reactor type can play important roles for an enhanced recovery of the desired products. Polystyrene (PS) wastes are excellent feedstocks for the chemical recycling owing to the capability of PS to be fully recycled. In this respect, the present work deals with the thermo-catalytic pyrolysis of PS in batch and semi-batch reactor setups. The main goal was to perform a comprehensive study on the depolymerisation of PS, thereby investigating the effect of reactor type, catalyst arrangement, feed to catalyst ratio and residence time on the yields of oil and styrene monomer (SM). A further goal was to identify the optimum operating conditions as well as reactor type for an enhanced recovery of oil and SM. It was demonstrated that the semi-batch reactor outperformed the batch reactor in terms of oil and SM yields in both thermal (non-catalytic) and catalytic tests performed at 400°C. Furthermore, it was shown that the layered arrangement of catalyst (catalyst separated from PS) produced a higher amount of oil with higher selectivity for SM as compared to the mixed arrangement (catalyst mixed with PS). Moreover, the effect of carrier gas flowrate on the product distribution was presented.

中文翻译：

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间歇式和半间歇式反应器中聚苯乙烯的热催化热解：比较研究

热催化热解被认为是一种很有前景的废弃聚合物材料的化学回收工艺，旨在将它们转化为原始单体或其他有价值的化学品。在这方面，工艺参数和反应器类型可以在提高所需产品的回收率方面发挥重要作用。由于聚苯乙烯 (PS) 废物具有完全回收的能力，因此聚苯乙烯 (PS) 废物是化学回收的优良原料。在这方面，目前的工作涉及分批和半分批反应器设置中 PS 的热催化热解。主要目标是对 PS 的解聚进行全面研究，从而研究反应器类型、催化剂布置、进料与催化剂比和停留时间对油和苯乙烯单体 (SM) 产率的影响。另一个目标是确定最佳操作条件以及反应器类型，以提高石油和 SM 的采收率。结果表明，在 400°C 下进行的热（非催化）和催化测试中，半间歇式反应器在油和 SM 产率方面优于间歇式反应器。此外，表明与混合排列（催化剂与 PS 混合）相比，催化剂的分层排列（与 PS 分离的催化剂）产生更多的油，对 SM 具有更高的选择性。此外，还介绍了载气流速对产物分布的影响。结果表明，在 400°C 下进行的热（非催化）和催化测试中，半间歇式反应器在油和 SM 产率方面优于间歇式反应器。此外，表明与混合排列（催化剂与 PS 混合）相比，催化剂的分层排列（与 PS 分离的催化剂）产生更多的油，对 SM 具有更高的选择性。此外，还介绍了载气流速对产物分布的影响。结果表明，在 400°C 下进行的热（非催化）和催化测试中，半间歇式反应器在油和 SM 产率方面的性能优于间歇式反应器。此外，表明与混合排列（催化剂与 PS 混合）相比，催化剂的分层排列（与 PS 分离的催化剂）产生更多的油，对 SM 具有更高的选择性。此外，还介绍了载气流速对产物分布的影响。