Method for the production of polyamides

US6703476B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ralf Mohrschladt · Schwetzingen, DE
• Helmut Winterling · Ludwigshafen, DE
• Dieter Krauss · Grünstadt, DE

Key dates

• Filing date: Jun 24, 2002
• Grant date: Mar 9, 2004
• Expiry date: Jun 24, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyamides are prepared from aminonitriles and water by(1) reacting the aminonitriles with water at from 180 to 350° C. and such a pressure in the range from 30 to 120 bar that a gaseous phase is present as well as a liquid phase, in a first reaction stage,(2) expanding the reaction mixture obtained in the first reaction stage via an evaporator zone or adiabatically with removal of water and ammonia into a second reaction stage, and(3) postcondensing in the second reaction stage at from 0.1 mbar to 5 bar and from 230 to 320° C.