Pyrolysis of polystyrene - polyphenylene oxide to recover styrene and useful products
- Lakewood, CO
- Arvada, CO
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.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO
- Assignee:
- Midwest Research Institute (Kansas City, MO)
- Patent Number(s):
- US 5386070
- OSTI ID:
- 869733
- Country of Publication:
- United States
- Language:
- English
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acid
affect
base
base catalyzed
carrier
carrier gas
catalyst
catalyzed
catalyzed reaction
causes
causes pyrolysis
components
components therein
comprising
constituent
constituent prior
convert
derived
differential
differential pyrolysis
differentially
differentially heating
enhance
enhance separation
fast
fast pyrolysis
feed
feed stream
gas
heat
heat rate
heating
maximize
maximize yield
monomer
monomeric
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oxide
oxide product
pathways
plastic
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plastic waste
polyphenylene
polyphenylene oxide
polystyrene
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product
products
provide
provide differential
pyrolysis
range
rate
reaction
reaction pathway
reaction pathways
recover
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selecting
selective
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separating
separation
stream
styrene
support
temperature
temperature range
therein
therein comprising
treating
useful
useful products
value
value monomer
value monomeric
value product
waste
yield