Process for fractionating water-containing crude amine mixtures from amine synthesis

US6821396B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Andreas Wölfert · Bad Rappenau, DE
• Heinz Rutter · Hochdorf-Assenheim, DE
• Stefan Rittinger · Mannheim, DE
• Mark Wehinger · Ludwigshafen, DE
• Aurelie Alemany · Stuttgart, DE
• Willi Schmidt · Ludwigshafen, DE

Key dates

• Filing date: Oct 17, 2002
• Grant date: Nov 23, 2004
• Expiry date: Oct 17, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A mixture containing mixture one or more amines, water, low-boilers and high-boilers, is fractioned in a process wherein(i) low-boilers are separated from the mixture by distillation,(ii) high-boilers are separated from the mixture by distillation,(iii) the mixture is extracted with a sodium hydroxide solution to form an aqueous, sodium-hydroxide-containing first phase and an aqueous-organic, amine-containing second phase, and(iv) the aqueous-organic second phase is distilled to form an amine/water azeotrope and an essentially anhydrous amine, and the amine/water azeotrope is recycled to the extraction step (iii).