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 (United States)
- 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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Related Subjects
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
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