To provide an apparatus for treating waste plastics in which production of crystalline organic materials such as terephthalic acid or benzoic acid due to excessive decomposition is prevented, resulting in prevention of choking and corrosion of the apparatus, easy temperature control and reduction of treatment cost.
The treatment apparatus comprises an oil-bath 13 which stores waste plastics 11 containing a chlorine-based polymer, an ester-based polymer and a hydrocarbon-based polymer and an oil maintained at 280-320°C, and a mixing impeller 14 provided in the oil-bath which agitates the oil in the oil-bath so that vertical convection current may not be produced. A removing port 13a is provided in the upper part of the oil-bath, from which are removed desalinization residues 26 that surface in the oil, waste plastics 27 that are not liquified, and a liquified oil 18 of the hydrocarbon-based polymer. An oil outlet 13b is provided in the lower part of the oil-bath, from which is discharged liquified oil 17 of the ester-based polymer that sediments in the oil. The desalinization residues and the like are thermally decomposed in the furnace body 33 of a heating furnace at 400-550°C to produce oil steam. A condensation tank 16 which surrounds the oil-bath and stores oil 38 reduces the temperature of the oil steam to 300-400°C, and maintains the oil in the oil-bath at 280-320°C.
DEN TAKEYOSHI
HATAKEYAMA KO
NISHIMURA KENJI
MORI RYOHEI
MURAYAMA SATOSHI
