オイルバスを利用した発泡ポリスチロール廃棄物の脱塩・減容化特性

抄録

Recovered thermoplastic plastics are generally recycled into plastic oil after being re-polymerized and pyrolyzed. However, foaming polystyrene drifting in the ocean or off the coast contains salt that adhered while drifting in the ocean for a long period of time because seawater can enter the inside of foaming polystyrene from damaged or cracked parts. This salt content generates hydrochloric acid gas during combustion and corrodes combustion equipment and piping when polystyrene expanded with seawater is reused as thermal decomposition oil or solid fuel. Therefore, these recycled products cannot be used due to salt contained in the material.

From the cost-saving perspective, we have proposed the development of a desalination and volume reduction device for foaming polystyrene. In this research, we investigated how much foamed polystyrene could be desalted and reduced in size by using oil bath. This attempt was intended to obtain necessary design data to develop a practical device. As a result, we could specify the optimum temperature for volume reduction and confirmed that salt concentrations in the samples were greatly reduced after foaming polystyrene that had drifted in seawater was reduced.