Continuous method for the production of polyamides

US7776996B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Jürgen Deininger · Oftersheim, DE
• Jürgen Demeter · Bischofswerda, DE
• Thilo Hahn · Kirchheimbolanden, DE
• Gad Kory · Gaiberg, DE
• Oliver Sötje · Mannheim, DE
• Peter Zehner · Ludwigshafen, DE

Key dates

• Filing date: Feb 8, 2005
• Grant date: Aug 17, 2010
• Expiry date: Feb 8, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A continuous process for producing polyamides, their oligomers or mixtures thereof, if appropriate with further reaction products, comprises reaction of aminonitriles or dinitriles and diamines or mixtures thereof, if appropriate together with further polyamide-forming monomers and/or oligomers, with an aqueous medium composed of aqueous monomer and oligomer extracts obtained from polyamide production by extraction of the polymer with water in a reactor which has a vertical longitudinal axis and through which there is a flow substantially in the longitudinal direction wherein water and/or the aqueous medium are introduced into the reactor at two or more different locations along the vertical longitudinal axis, wherein the aqueous medium is introduced at one or more locations.