초록 ▼

Disclosed is a method and apparatus for pyrolytically decomposing waste plastic which may contain halogen-containing polymer such as PVC. The plastic is heated at 270.degree. to 350.degree. C., whereby a plasticizer contained in the plastic material is decomposed and vaporized, and a chlorine-contai

Disclosed is a method and apparatus for pyrolytically decomposing waste plastic which may contain halogen-containing polymer such as PVC. The plastic is heated at 270.degree. to 350.degree. C., whereby a plasticizer contained in the plastic material is decomposed and vaporized, and a chlorine-containing polymer is dechlorinated to produce hydrogen chloride. The vaporized decomposition matter and the hydrogen chloride are removed from the plastic, and the vaporized decomposition matter is separated from the hydrogen chloride. Then isolated plastic is further heated to 450.degree. C. or higher to produce a pyrolysis product. Alternatively, the former heating step is divided into two steps of: heating at a temperature lower than 270.degree. C., whereby a plasticizer is decomposed; and heating to 270.degree. to 350.degree. C., whereby a chlorine-containing polymer contained in the plastic material is dechlorinated. Accordingly, the decomposition matter of plasticizer and hydrogen chloride are separately removed from the plastic.

대표청구항 ▼

[ What is claimed is:] [1.] A method of pyrolytically decomposing a plastic material, comprising the steps of:heating the plastic material at approximately 270 to 350.degree. C., whereby a plasticizer contained in the plastic material is decomposed into a decomposition matter which is vaporized, and

[ What is claimed is:] [1.] A method of pyrolytically decomposing a plastic material, comprising the steps of:heating the plastic material at approximately 270 to 350.degree. C., whereby a plasticizer contained in the plastic material is decomposed into a decomposition matter which is vaporized, and a chlorine-containing polymer contained in the plastic material is dechlorinated to produce a dechlorinated matter and hydrogen chloride;removing the vaporized decomposition matter and the hydrogen chloride, from the plastic material heated at the heating step;separating the vaporized decomposition matter from the hydrogen chloride by cooling the vaporized decomposition matter with a cooling oil which absorbs the decomposition matter and condensing the vaporized decomposition matter; andpyrolytrically decomposing the plastic material after the removing step, by heating the plastic material at approximately 450.degree. C. or a temperature higher than 450.degree. C. to produce a pyrolysis product.