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Title: Pyrolysis of polystyrene - polyphenylene oxide to recover styrene and useful products

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 themore » plastic into a polyphenylene oxide derived product; and separating the different derived high value polyphenylene oxide product.« less
Inventors:
 [1];  [2]
  1. (Lakewood, CO)
  2. (Arvada, CO)
Issue Date:
OSTI Identifier:
869733
Assignee:
Midwest Research Institute (Kansas City, MO) NREL
Patent Number(s):
US 5386070
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Country of Publication:
United States
Language:
English
Subject:
pyrolysis; polystyrene; polyphenylene; oxide; recover; styrene; useful; products; process; fast; carrier; gas; convert; plastic; waste; prior; components; therein; comprising; selecting; temperature; range; value; monomeric; constituent; causes; catalyst; support; treating; feed; stream; affect; acid; base; catalyzed; reaction; pathways; maximize; yield; enhance; separation; differentially; heating; heat; rate; provide; differential; selective; recovery; separating; monomer; derived; product; base catalyzed; heat rate; differentially heating; constituent prior; useful products; components therein; carrier gas; temperature range; monomeric constituent; feed stream; value monomeric; plastic components; plastic waste; provide differential; polyphenylene oxide; enhance separation; maximize yield; differential pyrolysis; catalyzed reaction; causes pyrolysis; therein comprising; reaction pathways; selective recovery; fast pyrolysis; value product; oxide product; value monomer; reaction pathway; /585/