| 摘要 |
<p>A technique of preparing oil from waste plastics, especially the one to which a mechanism of an extrusion molding machine is applied, is provided wherein an effective control of a decomposition process is conducted in order to effectively prevent the generation of carbon and to efficiently obtain recovered products having a desired composition. For this purpose, reactors 1a, 1b, and 1c having built in carrying means 3a, 3b, and 3c, respectively are used as connected in stages, in which reactors waste plastics are heated and decomposed into oil as carried. One or a series of reactors are used as a unit to form a melting zone and a decomposing zone in the carrying direction. In the melting zone the waste plastics in the solid form is melted and liquefied, and in the decomposing zone, the liquefied components supplied from the melting zone is allowed to form a shallow liquid phase section at the bottom of the reactors, and at the same time the gasified components evolved from the liquid phase section is allowed to form a gas phase section having a sufficiently large volume as compared with that of the liquid phase on top of the liquid phase section, the gasified components filling the gas phase section is guided to the outside and cooled, and then recovered as an oil. <IMAGE></p> |
