Recovery of styrene from waste polystyrene

Details Recovery of styrene from waste polystyrene Recovery of styrene from waste polystyrene

1996-08-29

1997-09-30

Caldarola, Glenn A.

Chemistry of hydrocarbon compounds

Production of hydrocarbon mixture from refuse or vegetation

From synthetic resin or rubber

585240, 585832, C07C 422, C07C 100

Patent

active

056727941

ABSTRACT:
Monomeric styrene is recovered from plastics waste containing styrene polymers by thermal depolymerization by a process in which the waste is transported in liquid or solid form into a fluidized bed of a solid heat transfer agent and is cracked or depolymerized in an average residence time of less than 60 seconds and styrene is obtained from the gaseous crack products. Preferably, magnesium aluminum silicate is used as a heat transfer agent and C.sub.1 -C.sub.6 -hydrocarbons formed as byproducts in the depolymerization are used as operating gas for maintaining the fluidized bed and are circulated.

REFERENCES:
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patent: 5264640 (1993-11-01), Platz
patent: 5369215 (1994-11-01), Platz
Recent Developments in the Thermal Degradation . . . , Guyot, Poly. Degrad. Stab. 15 (1986) 219-235.
Japanese Abstract J 4 9005-183.
Soviet Union Abstract SU 771-079.
Japanese Abstract J 2029-492.
Study on Thermal Degrad. . . , Ohtani et al., Eur. Polym. J. vol. 26, No. 8, pp. 893-899, 1990. abstract of JP-A 59 111 815).

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