Global to push GA events into
skip to main content

Title: Controlled catalytic and thermal sequential pyrolysis and hydrolysis of mixed polymer waste streams to sequentially recover monomers or other high value products

A process is described for using fast pyrolysis in a carrier gas to convert a plastic waste feedstream having a mixed polymeric composition in a manner such that pyrolysis of a given polymer to its high value monomeric constituent occurs prior to pyrolysis of other plastic components therein comprising: selecting a first temperature program range to cause pyrolysis of said given polymer to its high value monomeric constituent prior to a temperature range that causes pyrolysis of other plastic components; selecting a catalyst and support for treating said feed streams with said catalyst to effect acid or base catalyzed reaction pathways to maximize yield or enhance separation of said high value monomeric constituent in said temperature program range; 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 the high value monomeric constituent prior to pyrolysis of other plastic components; separating the high value monomeric constituents, selecting a second higher temperature range to cause pyrolysis of a different high value monomeric constituent of said plastic waste and differentially heating the feedstream at the higher temperature program range to cause pyrolysis of the different highmore » value monomeric constituent; and separating the different high value monomeric constituent. 87 figures.« less
Inventors:
;
Issue Date:
OSTI Identifier:
5123316
Assignee:
Midwest Research Inst., Kansas City, MO (United States) PTO; EDB-94-075359
Patent Number(s):
US 5300704; A
Application Number:
PPN: US 7-943889
Contract Number:
AC02-83CH10093
Resource Relation:
Patent File Date: 4 Dec 1992
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; MONOMERS; MATERIALS RECOVERY; PLASTICS; PYROLYSIS; FLASH HEATING; SEPARATION PROCESSES; CHEMICAL REACTIONS; DECOMPOSITION; HEATING; MANAGEMENT; MATERIALS; PETROCHEMICALS; PETROLEUM PRODUCTS; PROCESSING; SYNTHETIC MATERIALS; THERMOCHEMICAL PROCESSES; WASTE MANAGEMENT; WASTE PROCESSING; 320305* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management; 320604 - Energy Conservation, Consumption, & Utilization- Municipalities & Community Systems- Municipal Waste Management- (1980-)