Patent · US Expired

Method for the treatment of waste containing polyamide with the reprocessing of the depolymerisation residue

US7538143B2 · kind B2 · utility

1Cited by

20References

23Claims

0Family size

Assignee

Zimmer, Inc. · US

Inventors

Rudolf Kampf · Ortenburg, DE
Reinhard Wolf · Isny im Allgäu, DE
Joachim Seelig · Bad Orb, DE

Key dates

Filing date	Jul 23, 2004
Grant date	May 26, 2009
Priority date	—
Expiry date	May 9, 2025

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D201/12
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a method for the treatment of waste containing polyamide comprising a) depolymerisation of the waste containing polyamide, whereby a caprolactam raw material (6) and a flow (3), comprising the secondary constituents and additives from the depolymerisation, are obtained, and b) leaching of the flow (3) at least once using an extracting agent.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.