The present invention relates to a method of pyrolyzing (thermally decomposing) plastics, wastes containing the plastics, and macromolecular substances such as rubbers and also relates to a system or an apparatus therefore and to a pyrolysate (product) obtained by such method and system.
In order to recycle the plastic effectively, a practical method of thermal decomposition and reduction to oil under a non-oxygen environment has been developed and implemented fractionally. This method recycles the plastics that are macromolecular petrochemicals and these molecules are oligomoleculized as an oil product through the pyrolysis process to be reusable as a liquid fuel.
In order to make the property of synthesized oil product effective, it is a common practice to use a catalyst like synthetic zeolite and metals for catalytic reforming of the oil product.
Due to different kinds of plastics and mixed materials, it was hard to keep the constant quality level of oil products because the oil products, which were derived through the above-mentioned plastic thermal decomposition method, varied in the chemical properties and components depending on every kind of material plastics and materials being mixed.
Furthermore, in a method to refine the quality of the oil products using a typical catalyst such as the synthetic zeolite, it is hard to synthesize the oil products of kerosene and light oil even though the oil products are refined after the thermal decomposition. This means that it is infeasible to keep the quality chemical properties of the products and the stable components. Therefore, most of the products are burnt for the sake of direct heating source using a burner.
The method for refining the chemical properties of oil products based upon the catalysis provides a problem of an expensive running cost and a health hazard incurred by poisoning with mixed foreign matters.
Furthermore, the oil products are susceptible to change in the chemical property for the long run. They are usually classified in Japan as the forth class of dangerous material of the first type of oil product and handled as dangerous materials. Such oil products are subjected to Japanese government regulations. Their usage and stock pilling are also subjected to the restrictions. These regulations and the restrictions have caused problems of handling and operation of the products.