Process for producing polyamides from aminonitriles

US6194538A · kind A · utility

Assignee

• BASF SE

Inventors

• Robert A. Weiss · Summit, US
• Dieter Krauss · Grünstadt, DE
• Dieter Keller · Aschaffenburg, DE
• Gunter Pipper · Bad Dürkheim, DE
• Wolfgang Harder · Weinheim, DE
• Alfons Ludwig · Ankum, DE
• Ralf Mohrschladt · Schwetzingen, DE

Key dates

• Filing date: Feb 22, 1999
• Grant date: Feb 27, 2001
• Expiry date: Feb 22, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/36
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing a polyamide by reacting at least one aminonitrile with water comprises: PA1 (1) reacting at least one aminonitrile with water at a temperature from 100 to 360.degree. C. and a pressure from 0.1 to 35.times.10.sup.6 Pa to obtain a reaction mixture, PA1 (2) further reacting the reaction mixture at a temperature from 150 to 400.degree. C. and a pressure which is lower than the pressure in step 1, the temperature and the pressure being selected so as to obtain a first gas phase and a first liquid or a first solid phase or a mixture of first solid and first liquid phase, and the first gas phase is separated from the first liquid or the first solid phase or from the mixture of first liquid and first solid phase, and PA1 (3) admixing the first liquid or the first solid phase or the mixture of first liquid and first solid phase with a gaseous or liquid phase comprising water at a temperature from 150 to 360.degree. C. and a pressure from 0.1 to 30.times.10.sup.6 Pa to obtain a product mixture.