Controlled catalytic and thermal sequential pyrolysis and hydrolysis of mixed polymer waste streams to sequentially recover monomers or other high value products
A process of using fast pyrolysis in a carrier gas to convert a polyamide containing a plastic waste feed stream having a mixed polymeric composition in a manner such that pyrolysis of a given polyamide and its high value monomeric constituent or derived high value products occurs prior to pyrolysis of other plastic components is described therein comprising: (a) selecting a first temperature program range to cause pyrolysis of said given polyamide and its high value monomeric constituent prior to a temperature range that causes pyrolysis of other plastic components; (b) selecting a catalyst and a support and treating said feed stream with said catalyst to affect acid or base catalyzed reaction pathways to maximize yield or enhance separation of said high value monomeric constituent or high value product of said polyamide in said first temperature program range; (c) differentially heating said feed stream at a heat rate within the first temperature program range to provide differential pyrolysis for selective recovery of optimum quantities of said high value monomeric constituent or high value product of said polyamide prior to pyrolysis of other plastic components therein; (d) separating said high value monomer constituent or derived high value product of said polyamide; (e) selecting a second higher temperature program range to cause pyrolysis to a different high value monomeric constituent of said plastic waste and differentially heating said feed stream of said higher temperature program range to cause pyrolysis of said plastic into a different high value monomeric constituent or derived product; and (f) separating said different high value monomeric constituent or derived high value product.
- Assignee:
- Midwest Research Institute, Kansas City, MO (United States)
- Patent Number(s):
- US 5216149; A
- Application Number:
- PPN: US 7-711546
- OSTI ID:
- 6475265
- Resource Relation:
- Patent File Date: 7 Jun 1991
- Country of Publication:
- United States
- Language:
- English
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Controlled catalytic and thermal sequential pyrolysis and hydrolysis of mixed polymer waste streams to sequentially recover monomers or other high value products
Controlled catalytic and thermal sequential pyrolysis and hydrolysis of mixed polymer waste streams to sequentially recover monomers or other high value products
Related Subjects
MONOMERS
MATERIALS RECOVERY
POLYMERS
WASTE PROCESSING
CATALYSTS
HYDROLYSIS
PYROLYSIS
CHEMICAL REACTIONS
DECOMPOSITION
LYSIS
MANAGEMENT
PROCESSING
SOLVOLYSIS
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management