Sequential pyrolysis of plastic to recover polystyrene HCL and t

Details Sequential pyrolysis of plastic to recover polystyrene HCL and t Sequential pyrolysis of plastic to recover polystyrene HCL and t

1995-01-09

1995-11-07

Straub, Gary P.

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423481, 585240, 588216, 588226, F23G 712

Patent

active

054646022

ABSTRACT:
A process of pyrolyzing plastic waste feed streams containing polyvinyl chloride, polyethylene terephthalate, polystyrene and polyethylene to recover polystyrene HCl and terephthalic acid comprising: heating the plastic waste feed stream to a first temperature; adding an acid or base catalyst on an oxide or carbonate support; heating the plastic waste feed stream to pyrolyze polyethylene terephthalate and polyvinyl chloride; separating terephthalic acid or HCl; heating to a second temperature to pyrolyze polystyrene; separating styrene; heating the waste feed stream to a third temperature to pyrolyze polyethylene; and separating hydrocarbons.

REFERENCES:
patent: 3750600 (1973-08-01), Ohsol et al.
patent: 3829558 (1974-08-01), Banks et al.
patent: 4982027 (1991-01-01), Korff et al.
patent: 5072068 (1991-12-01), Luo et al.
patent: 5136111 (1992-08-01), Chum et al.

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