Method and device for the production of polyamide 6 with low extract content

US11066518B2 · kind B2 · utility

Assignee

• Technip Zimmer GMBH · DE

Inventors

• Stefan Deiss · Harxheim, DE
• Raimund Schwarz · Erlangen, DE
• Martin Baumert · Dossenheim, DE
• Gerald Kriesche · Neuenstadt am Kocher, DE
• Maurice Koch · Düsseldorf, DE

Key dates

• Filing date: Sep 25, 2018
• Grant date: Jul 20, 2021
• Expiry date: Sep 25, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L77/02
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a method for the production of polyamide 6 with low extract content and a device for it. Here, a melt of non-extracted polyamide 6 is cleaned from monomer and oligomers in a degasification device in vacuum, wherein the vapor being withdrawn from the degasification device by the vacuum generation device is cleaned from monomer, oligomers and optionally water at first in a direct condenser which is operated with liquid ε-caprolactam and subsequently in a pre-separator which is cooled with a coolant, before it reaches the vacuum generation device. A particularly preferable variant of the method envisages the usage of the melt of polyamide 6 with low extract content so prepared in a direct process of spinning into textile fibers and/or filaments.