Method of reclaiming styrene and other products from polystyrene

Details Method of reclaiming styrene and other products from polystyrene Method of reclaiming styrene and other products from polystyrene

1993-01-28

1995-04-11

McFarlane, Anthony

Chemistry of hydrocarbon compounds

Production of hydrocarbon mixture from refuse or vegetation

From synthetic resin or rubber

585240, 585439, C07C 404

Patent

active

054060109

ABSTRACT:
In the method for reclaiming styrene monomer from polystyrene, polystyrene is mixed with a solvent and heated to approximately 300.degree. C. to 400.degree. C. to depolymerize the polystyrene to produce a styrene monomer fraction and a heavier fraction of partial depolymerization products. The styrene fraction is separated from the heavier fraction to recover the styrene monomer and polystyrene partial depolymerization products. In a preferred embodiment, the solvent comprises a "styrene oil" which results from the incomplete depolymerization of polystyrene, at least a portion of which is recycled to mix with polystyrene. The method is useful in reclaiming styrene monomer from napalm, foamed polystyrene, and other polystyrene products. In the case of reclamation of napalm, the method also includes the steps of separating and recovering benzene and gasoline.

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