抄録
Polyvinyl chloride (PVC) has been used extensively. On the contrary, any kinds of plastic waste recycling have been proposed. In particular, it is thought that these are reused as material for blast furnace, gasification and liquefaction. In these processes, organic chlorine such as PVC in plastic waste may causes dioxin emission or furnace corrosion. One of the processes to the solution of these problems includes prior dechlorination. There are several methods for the dechlorination treatments. However, those methods are based on the simple heat treatment by heating up the whole wastes, so other organic materials are also heating up during the dechlorination treatment. It means that the energy efficiency is very low. On the other hand, the dechlorination treatment with microwave irradiation is able to heat up the C-Cl bond selectively; and the band could be cut without deteriorating hydrocarbon. In this study, to evaluate the dechlorination behavior due to the microwave irradiation, the experiment has been done. Polyvinyl chloride (PVC) was used as organic chlorine waste. The decomposition profile of PVC in fixed bed by the microwave irradiation was compared with that by convectional heating in constant temperature in the bed. It was clarified that the rate of dechlorination by the microwave irradiation was much faster than that by the convectional heating. It also turned out that the dechlorination by the microwave irradiation started at lower temperature than that by the convection heating. Secondly, transition of dechlorination ratio and temperature in bed was measured at constant microwave output. Fluidized bed was used to irradiate evenly. It was indicated that temperature of PVC started increasing rapidly from about 450 K and dechlorination also started at any conditions. From observation of residue after irradiation, decomposition in fluidized bed took place evenly.
