Dehydrochlorination characteristics of waste PVC wires by thermal decomposition

In this work, the dehydrochlorination characteristics of waste PVC wires in ASR have been studied by static quartz tube reactor under various reaction temperatures. The effect of CaO additive has been investigated to eliminate HCl obtained from thermal decomposition of waste PVC wires. Also to obtain the overall activation energy of dehydrochlorination reaction of waste PVC wires, the dynamic thermogravimetric analysis (TGA) curve and its derivative were analyzed. From this work, it was found that Friedman method gave the activation energies of 89.1–166.8 kJ/mol, while Ozawa method gave the activation energies of 94.2–118.6 kJ/mol and the activation energy increased as increasing of conversion. The formation of gaseous products significantly was suppressed and the amount of HCl was obviously reduced by addition of CaO.