《Table 4–Cl distribution in the products of PVC pyrolysis (Ma et al., 2002) .》

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《Review on fate of chlorine during thermal processing of solid wastes》

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The releasing behavior of HCl is influenced by experimental conditions，catalysts/absorbents and interactions between volatiles and residues（McNeill et al.，1995；Miranda et al.，1999b；Ma et al.，2002；Wikstr?m et al.，2003a；López et al.，2011，2012；Zhou et al.，2016）.Table 4 shows the Cl distribution in the products produced from the pyrolysis of PVC（Ma et al.，2002）.More than 90%of total Cl in PVC is released as HCl in the first stage（200–360°C）.A lower operating pressure like vacuum and a longer retention time at operating temperatures may enhance the release of HCl（Miranda et al.，1999b，2001；Ma et al.，2002）.The presence of oxygen（O2）in the atmosphere will lead to the formation of Cl2from HCl through the Deacon reactions（Wikstr?m et al.，2003a，2003b）.The addition of catalysts/absorbents（e.g.，Fe2O3and CaO）can significantly fix the HCl and change the distribution of Cl in products，as it is discussed in detail in the following part of this review.