Depolymerisierung von Polyurethan- und Polyisocyanuratschaumstoffen mittels Aminolyse und Zugehörige Verfahren

Details

Veröffentlichungs-Nr.

EP4748876

Anmeldetag

22. November 2024

Veröffentlichung

27. Mai 2026

Rechtsraum

EP

IPC

C08J11/10, C08J11/28

Abstract

A method for depolymerizing rigid polymeric polyurethane (PUR) or polyisocyanurate (PIR) foams involves grinding the foams to form a powder, adding the powder to liquid aliphatic amines to obtain a reaction mixture, and performing an aminolysis reaction on the reaction mixture under an inert atmosphere at elevated temperatures and extended incubation times. The process allows for the recovery of polymeric methylene diphenyl diisocyanate (PMDA) in high purity and high yields from the depolymerized foams. The method also includes recovering PMDA by precipitation and using it as a precursor to obtain polymeric methylene diisocyanate (PMDI) for the synthesis of PUR and PIR foams.

Anmelder

Firma

VITO NV

Land

🇧🇪 Belgien