Global to push GA events into
skip to main content

Title: Controlled catalytic and thermal sequential pyrolysis and hydrolysis of polymer waste comprising nylon 6 and a polyolefin or mixtures of polyolefins to sequentially recover monomers or other high value products

A process of 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 high value monomericmore » constituent; and separating the different high value monomeric constituent.« less
 [1];  [2]
  1. (Lakewood, CO)
  2. (Arvada, CO)
Issue Date:
OSTI Identifier:
Midwest Research Institute (Kansas City, MO) NREL
Patent Number(s):
US 5359061
Contract Number:
Research Org:
MIDWEST RESEARCH INSTITUTE; National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
Country of Publication:
United States
controlled; catalytic; thermal; sequential; pyrolysis; hydrolysis; polymer; waste; comprising; nylon; polyolefin; mixtures; polyolefins; sequentially; recover; monomers; value; products; process; fast; carrier; gas; convert; plastic; feedstream; mixed; polymeric; composition; manner; monomeric; constituent; occurs; prior; components; therein; selecting; temperature; range; causes; catalyst; support; treating; feed; streams; effect; acid; base; catalyzed; reaction; pathways; maximize; yield; enhance; separation; differentially; heating; stream; heat; rate; provide; differential; selective; recovery; optimum; quantities; separating; constituents; sequentially recover; recover monomers; waste comprising; occurs prior; optimum quantities; sequential pyrolysis; thermal sequential; base catalyzed; mixed polymeric; controlled catalytic; polymer waste; constituent occurs; heat rate; effect acid; waste feedstream; differentially heating; waste feed; polymeric composition; constituent prior; monomeric constituents; components therein; carrier gas; temperature range; monomeric constituent; feed stream; value monomeric; plastic components; plastic waste; provide differential; enhance separation; maximize yield; feed streams; differential pyrolysis; catalyzed reaction; causes pyrolysis; therein comprising; reaction pathways; selective recovery; fast pyrolysis; mixed polymer; value products; value product; value monomer; reaction pathway; /999/585/