Behavior of Cl, S and Pb Remaining in Solid Residue during Pyrolysis of PVC Electric Cable Insulator

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The behavior of chlorine, sulfur and lead remaining in the solid residue during PVC pyrolysis in N2 and H2O-N2 atmospheres at 673 to 1073 K was investigated for a basic study on chemical recycling of PVC electric cable insulator wastes. It was found that chlorine, sulfur and lead remained in the solid residue as CaCl2, CaSO4 and Pb, when PVC containing CaCO3 was decomposed in N2 atmosphere. In the thermal decomposition of PVC that does not contain CaCO3, chlorine and sulfur were more liable to be released from solid to gas phase at a higher temperature. Lead remained as PbCl2 in the solid residue at a low temperature, but PbCl2 was volatilized when the temperature was higher than 873 K. In H2O-N2 gas atmosphere, the content of chlorine remaining in the solid residue decreased as the temperature was elevated. The content of sulfur in the solid residue was almost constant with temperature. On the other hand, in the presence of H2O in PVC decomposition, the content of lead in the solid residue increased with an increase in temperature, since PbCl2 was reduced to less volatile Pb.
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