Continuous reactor for thermal degradation of polystyrene and method for recovery of styrene using it

摘要

PURPOSE: A continuous reactor used for polystyrene pyrolysis and a method for collecting styrene monomers using the same are provided to discharge residues of the pyrolysis out of the reactor continuously, thus to prevent the deposition of such residues in the reactor and the generation of side products, and, as a result, to improve the generation of oil and the production yield of styrene monomers. CONSTITUTION: The continuous reactor used for polystyrene pyrolysis in which waste polystyrene is thermally decomposed and useful components are recollected, comprises: a reactor(5) in the form of a double tube comprising, as one unit, a first cylinder(6) and a secondary cylinder(7), each of which has a different diameter; an inlet hole(10) formed on the upper part of the reactor, through which melted polystyrene particles are introduced,; an exhausting hole(11) formed on the upper part of the reactor, through which gas generated from the pyrolysis is exhausted; and a discharging hole(12) for residues formed on the bottom part of the reactor, through which residues from the pyrolysis are discharged. The method for collecting the styrene monomer using the same comprises: melting crushed waste polystyrene; feeding the melted polystyrene particles to the reactor; subjecting the melted polystyrene to pyrolysis as passing the first cylinder and flowing down along the inner wall of the secondary cylinder, wherein gas is generated during the pyrolysis; injecting nitrogen gas into the reactor by using a nitrogen gas injector(9); discharging the generated residues after the pyrolysis out of the reactor in continuous way; liquefying the gas through a heat exchanger(13) so as to generate and collect oil(14) comprising styrene monomers.