A METHOD FOR SEPARATING POLYAMIDE FROM A WASTE STREAM PRIMARILY COMPOSED OF A MIXTURE OF POLYMERIC MATTER

Abstract

This document summarizes the claims for selective depolymerization of polyamides, either pure or in mixtures, for instance textiles, blends, composites, multilayers or complex mixed polymers comprising but not limited to polyamides, polyesters, polycarbonate, cotton, polyurethanes, polyolefins and spandex. The present methods are a solution for the chemical recycling of polyamides either via dissolution (extractive approach) or depolymerization (deconstructive approach), in a way that is no seen in literature. The ways to perform this can be summarized in two approaches: a completely alcoholic medium: ALCHYD+ (Alcoholic acidic hydrolysis) and WALCHYD+ (Aqueous-Alcoholic acidic hydrolysis). With ALCHYD+, selective dissolution and/or depolymerization of polyamides can be performed, whilst with WALCHYD+, one-pot selective depolymerization of polyamides can be performed.

Inventors

THIELEMANS, Wim
RUBIO ARIAS, Jose Jonathan

Assignees

KATHOLIEKE UNIVERSITEIT LEUVEN

Dates

Publication Date: 20260507
Application Date: 20250630
Priority Date: 20240628