Study on pyrolysis characteristics of waste - Evaluation of PVC-containing automobile parts for dechlorination characteristics during pyrolysis

摘要

With the aim of developing an effective pre-processing technique for making compound waste plastics containing PVC harmless and recyclable, we conducted a study to evaluate the pyrolysis behavior of chlorine contained in waste when incinerating dust that is produced as a result of disposing of automobile interior components and used cars (hereinafter abbreviated as "ASR"). During this study, we observed that the pyrolysis characteristics of plastic units that comprise automobile interior components and those of compound waste plastics were almost consistent. In addition, both allowed selective pyrolysis of PVC, with resulting dechlorination rates of 80% or higher under heating conditions of 280°C or higher across the different heating methods used. It was presumed, however, that chlorine contained in ASR was emitted through pyrolysis, but that the chlorine thus emitted was ultimately captured in the residual sand in the form of metallic salt, due to the actions of Iron and non-ferrous metals contained in ASR.