Method, device and use for reprocessing substantially polyalkylene terephthalate

US12071521B2 · kind B2 · utility

Assignee

• RITTEC UMWELTTECHNIK GMBH · DE

Inventors

• Carsten Eichert · Lüneburg, DE
• Esther Brepohl · Lüneburg, DE
• Stephan Scholl · Bad Dürkheim, DE
• Lars Biermann · Lüneburg, DE

Key dates

• Filing date: Sep 4, 2019
• Grant date: Aug 27, 2024
• Expiry date: Sep 4, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/62
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method and a device for reprocessing waste products containing substantially polyalkylene terephthalate, particularly polyethylene terephthalate and/or polybutylene terephthalate, in a continuous process by means of depolymerizing is provided. A solid alkali hydroxide and/or alkali earth hydroxide, particularly sodium hydroxide, is added to the waste products for producing a reaction mixture, suitable for recycling multilayer systems and colored material nearly entirely chemically into the starting materials at a high throughput and high quality, in order to be able to produce new polyalkylene terephthalate products from the recycling products without limitation. An alkylene glycol is additionally added to the reaction mixture as a reactant, wherein the alkylene glycol is an alkylene glycol produced as a product of the intended depolymerizing, particularly MEG. No further reactive components are added to the reaction mixture.