Pyrolysis of polystyrene - polyphenylene oxide to recover styren

Details Pyrolysis of polystyrene - polyphenylene oxide to recover styren Pyrolysis of polystyrene - polyphenylene oxide to recover styren

1992-10-27

1995-01-31

Pal, Asok

Chemistry of hydrocarbon compounds

Production of hydrocarbon mixture from refuse or vegetation

From synthetic resin or rubber

585242, C07C 422

Patent

active

053860705

ABSTRACT:
A process of using fast pyrolysis in a carrier gas to convert a polystyrene and polyphenylene oxide plastic waste to a given polystyrene and polyphenylene oxide prior to pyrolysis of other plastic components therein comprising:
selecting a first temperature range to cause pyrolysis of given polystyrene and polyphenylene oxide and its high value monomeric constituent prior to a temperature range that causes pyrolysis of other plastic components;
selecting a catalyst and a support and treating the feed stream with the catalyst to affect acid or base catalyzed reaction pathways to maximize yield or enhance separation of high value monomeric constituent of styrene from polystyrene and polyphenylene oxide in the first temperature range;
differentially heating the feed stream at a heat rate within the first temperature range to provide differential pyrolysis for selective recovery of the high value monomeric constituent of styrene from polystyrene and polyphenylene oxide prior to pyrolysis of other plastic components;
separating the high value monomer constituent of styrene;
selecting a second higher temperature range to cause pyrolysis to a different derived high value product of polyphenylene oxide from the plastic waste and differentially heating the feed stream at the higher temperature range to cause pyrolysis of the plastic into a polyphenylene oxide derived product; and
separating the different derived high value polyphenylene oxide product.

REFERENCES:
patent: 2383922 (1945-08-01), Soday
patent: 5072068 (1991-10-01), Luo et al.
patent: 5136117 (1992-08-01), Paisley et al.
patent: 5216149 (1993-06-01), Evans et al.

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