Abstract A powder characterization method was developed to screen the ability of a range of chemicals and absorbents to retain chlorine from chlorinated plastic pyrolysis. The behaviour of adsorbents such as Al2O3 and zeolites, and chemical removers based on NaHCO3, CaO and Na2CO3-ZnO were studied for the removal of HCl released during PVC pyrolysis. First, chlorine removers are mixed with PVC and tested in a thermobalance under pyrolysis conditions for the complete PVC dehydrochlorination (550 °C). Subsequently, after the release of HCl, CO2 and H2O, the chars are analysed by FTIR, CHN elemental analysis and ESEM-EDS to determine the retention of chlorine on the chlorine removers. According to FTIR and CHN, PVC pyrolysis occurs through dehydrochlorination and the formation of aromatics. FTIR and EDS were used to follow the consumption of the bases present in the chemical removers and the suppression of the C Cl absorption bands of the PVC CHCl groups during pyrolysis, as well as the formation of the resulting salts (NaCl, CaCl2 and ZnCl2). The chemical removers exhibited chlorine retentions of up to 71 wt. % (using Na2CO3-ZnO), while the adsorbents presented a maximum of 19 % of retention at 550 °C and heating rate of 200 °C/min.

中文翻译：

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从 PVC 的热重热解中去除盐酸

摘要 开发了一种粉末表征方法来筛选一系列化学品和吸收剂从氯化塑料热解中保留氯的能力。研究了吸附剂（如 Al2O3 和沸石）以及基于 NaHCO3、CaO 和 Na2CO3-ZnO 的化学去除剂去除 PVC 热解过程中释放的 HCl 的行为。首先，将除氯剂与 PVC 混合并在热解条件下在热天平中测试以完成 PVC 脱氯化氢（550 °C）。随后，在释放 HCl、CO2 和 H2O 后，通过 FTIR、CHN 元素分析和 ESEM-EDS 对炭进行分析，以确定氯在除氯剂上的保留情况。根据 FTIR 和 CHN，PVC 热解通过脱氯化氢和芳烃的形成发生。FTIR 和 EDS 用于跟踪化学去除剂中存在的碱的消耗和热解过程中 PVC CHCl 基团的 C Cl 吸收带的抑制，以及所得盐（NaCl、CaCl2 和 ZnCl2）的形成. 化学去除剂的氯保留量高达 71 重量％。%（使用 Na2CO3-ZnO），而吸附剂在 550 °C 和 200 °C/min 的加热速率下的保留率最高为 19%。