Patent ID: 6172275
Filing Date: 2001-01-09
Classification: C10G

Abstract:
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.