Extraction of polylactams

US4051113A · kind A · utility

Assignee

• Badische Anilin- & Soda-Fabrik Aktiengesellschaft

Inventors

• Ernst Kissel
• Eckart Neumann · Bischofswerda, DE
• Ernst Guenther · Ludwigshafen, DE
• Guenter Valentin · Ludwigshafen, DE
• Werner Hoerauf · Ludwigshafen, DE

Key dates

• Filing date: Aug 28, 1973
• Grant date: Sep 27, 1977
• Expiry date: Aug 28, 1993

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/46
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The continuous countercurrent extraction of polylactam granules with hot water in an extraction zone for the removal of monomer and/or oligomers, the extraction zone being subdivided into subzones by at least one heating zone. The density of the extract-containing water differs by at least 0.0002 between the subzones.