Kabushiki Kaisha Toshiba

Satoshi Kanazawa

Kazuo Suzuki

Takeshi Gotanda

Masao Koyama

Hideki Shimada

Yukishige Maezawa

Masahiro Tadauchi

Terunobu Hayata

Fuminobu Tezuka

Jiro Kano

Isao Ito

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&deg; to 350&deg; 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&deg; 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&deg; C., whereby a plasticizer is decomposed; and heating to 270&deg; to 350&deg; 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.

Method and apparatus for pyrolytically decomposing waste plastic

Growing community of inventors

Tokyo, Japan

Satoshi Kanazawa