Treatment of waste plastics material

摘要

A method for the continuous treatment of waste plastic comprises; providing a plurality of pyrolysis units 10 connected in a continuous circuit, each unit having a central reaction chamber 14 in which a conveying screw 16 is mounted and a heating chamber 15 surrounding the central chamber; providing a bed 18 of substantially inert particulate heat sink material in the central chambers; operating the screws; supplying waste plastics materials to the centre chamber; and collecting gaseous product from at least one of the pyrolysis units downstream. The plastics material may be compressed in the form of a plug before addition to pyrolysis chamber. The heat sink material may be collected and separated from solid debris before reuse, may comprise a metal or metal oxide and may be in the form of powder or flakes. Apparatus for use with the method is also disclosed.